No-upload tools

Calculate Body Mass Index (BMI) and body surface area from weight and height. Includes BMI classification.

Calculate mean arterial pressure (MAP) from systolic and diastolic blood pressure.

Calculate ideal body weight by height using the Devine, Robinson, Miller, and Hamwi formulas.

Calculate corrected QT (QTc) using Bazett, Fridericia, Framingham, and Hodges formulas.

Calculate LDL cholesterol using the Friedewald formula from total cholesterol, HDL, and triglycerides.

Calculate fluid resuscitation volume for burn patients using the Parkland formula.

Convert HbA1c percentage to estimated average glucose (eAG) in mg/dL and mmol/L.

Confusion Assessment Method for the ICU (CAM-ICU) for delirium screening in critically ill patients.

Classify asthma control using the GINA 2025 criteria (well-controlled, partly controlled, uncontrolled).

CAGE questionnaire for alcohol use disorder screening (4 questions).

Calculate SAAG to differentiate portal hypertensive from non-portal hypertensive ascites.

Calculate transferrin saturation index from serum iron and total iron-binding capacity (TIBC).

Score cognitive function with the 30-point Mini-Mental State Examination.

Predict 6-month mortality in alcoholic hepatitis patients on steroid therapy using the Lille model.

Stratify Covid-19 severity by clinical and laboratory criteria.

Assess nicotine dependence severity with the Fagerström Test (6 questions).

Estimate total blood volume by weight, height, and sex (Nadler formula).

Estimate glomerular filtration rate (eGFR) using the 2021 CKD-EPI creatinine equation.

Estimate creatinine clearance using the Cockcroft-Gault formula.

Estimate glomerular filtration rate using the 4-variable MDRD equation.

Differentiate prerenal from intrinsic acute kidney injury using FENa.

FEUrea for AKI workup in patients on diuretics where FENa is unreliable.

Calculate UPCR from a single urine sample to estimate 24-hour protein excretion.

Calculate bicarbonate replacement dose for severe metabolic acidosis.

Calculate gestational age and estimated due date from last menstrual period (Naegele rule).

Calculate gestational age and due date from ultrasound biometry.

Calculate the APGAR score at 1 and 5 minutes for newborn assessment.

Pediatric-adapted Glasgow Coma Scale for infants and children.

Estimate uncuffed and cuffed ETT size and depth by age in children.

Pediatric drug infusion rate calculator in mcg/kg/min.

Pediatric drug infusion rate calculator in mg/kg/hour.

Score severity of neonatal abstinence syndrome using the Finnegan scale.

Score consciousness in infants and pre-verbal children on three responses, 3 to 11, where the standard Glasgow verbal items do not apply.

Seven CBC findings become a 0 to 7 sepsis screen for newborns, so you can risk-stratify while the blood culture is still pending.

Estimate gestational age from five physical findings in the first day of life, for when ultrasound dating or a last menstrual period is missing.

Combines physical signs with neurological responses to date a newborn, the Capurro variant to reach for after the first 24 hours of life.

Calculate serum osmolality from sodium, glucose, and BUN.

Correct total serum calcium for hypoalbuminemia.

Correct serum sodium for hyperglycemia (Katz / Hillier formulas).

Calculate total body iron deficit for IV iron replacement using the Ganzoni formula.

Convert between benzodiazepine doses (diazepam, lorazepam, alprazolam, clonazepam, etc.).

Convert between corticosteroid doses (prednisone, dexamethasone, hydrocortisone, etc.).

Convert between opioid doses to morphine milligram equivalents (MME).

Calculate induction and paralytic doses for rapid sequence intubation by weight.

Correct total phenytoin level for albumin and renal function (Sheiner-Tozer).

Convert IV drip rate from drops per minute (gtt/min) to mL/hour and vice versa.

Convert a vasoactive order written in mcg/kg/min into the pump rate in mL/hour, from patient weight and bag concentration.

Estimate the expected normal PaO2 based on patient age.

Calculate the PaO2/FiO2 ratio (P/F ratio) and classify ARDS severity by Berlin criteria.

Calculate SpO2/FiO2 ratio and equivalence to PaO2/FiO2 for non-invasive ARDS assessment.

Full Outline of UnResponsiveness (FOUR) score for coma assessment.

Grade subarachnoid hemorrhage by CT scan appearance using the Fisher scale.

Glasgow Coma Scale with pupil reactivity score (GCS-P).

Lawton Instrumental Activities of Daily Living scale for functional assessment in elderly.

Ramsay scale for level of sedation assessment (1–6).

Richmond Agitation-Sedation Scale (RASS) for ICU sedation assessment.

Riker Sedation-Agitation Scale (SAS) for ICU sedation.

Canadian Cardiovascular Society (CCS) functional classification of angina pectoris.

Aldrete and Kroulik post-anesthesia recovery score.

Eastern Cooperative Oncology Group performance status scale (0–5).

Karnofsky Performance Status scale (0–100) for assessing oncology patient function.

Palliative Performance Scale (PPS) for hospice and palliative care prognosis.

Six prognostic parameters that estimate survival in metastatic spinal disease and point toward excisional, palliative, or conservative care.

Primary tumor grade plus visceral and bone spread give a 2 to 10 score that maps onto a surgical strategy, from wide excision down to supportive care.

PaP score for 30-day survival probability in palliative cancer patients.

Predict remaining weeks in advanced cancer from bedside findings alone: performance status, intake, edema, dyspnea at rest, and delirium. No labs needed.

Calculate cumulative cigarette smoking exposure in pack-years.

Add up four ICU risk factors: a total of 3 or more flags invasive candidiasis in non-neutropenic patients and justifies an antifungal work-up.

Estimate the yearly stroke risk of non-valvular atrial fibrillation, running from roughly 1.9 percent at zero points to 18 percent at six.

Place a heart failure patient in class I through IV by how much ordinary activity it takes to bring the symptoms on.

Check the GELF markers of high tumor burden to settle whether follicular lymphoma calls for treatment now or watchful waiting.

Disease Activity Score (28 joints) with CRP for rheumatoid arthritis activity.

Disease Activity Score (28 joints) with ESR for rheumatoid arthritis activity.

ABCD2 score for stroke risk after transient ischemic attack.

Albumin, INR, mental status, systolic pressure and age combine into a 0 to 5 estimate of in-hospital death after an upper GI bleed.

Twelve physiologic variables plus age and chronic health status, scored 0 to 71, with the predicted ICU mortality attached to each band.

Five findings available within the first 24 hours flag which acute pancreatitis admissions carry the higher mortality, well before a CT severity index is usable.

Weigh temperature, white count, secretions, oxygenation, chest film and cultures into a 0 to 12 score; anything above 6 argues for treating ventilator-associated pneumonia.

Estimate in-hospital major bleeding risk in NSTE-ACS from eight variables, then weigh it against ischemic risk before choosing antithrombotics.

CURB-65 score for community-acquired pneumonia severity and mortality risk.

Caprini Risk Assessment for venous thromboembolism in surgical patients.

Modified Centor score for streptococcal pharyngitis probability.

Seven risk factors give a 0 to 9 stroke risk score for non-valvular atrial fibrillation, with the annual risk and the anticoagulation threshold for each sex.

Child-Pugh score for prognosis of chronic liver disease and cirrhosis.

Age, BMI, glucose status, AST/ALT, platelets and albumin give a non-invasive read on advanced fibrosis in fatty liver, with both NFS cutoffs applied.

10-year cardiovascular disease risk by Framingham equations.

10-year heart attack and stroke risk by the ACC/AHA Pooled Cohort Equations.

10- and 30-year risk of CVD, ASCVD and heart failure by the AHA PREVENT equations.

Predict chemotherapy-associated clot risk in ambulatory cancer patients from cancer site, blood counts and BMI, plus the threshold where prophylaxis is worth considering.

Lee RCRI for preoperative cardiac risk in non-cardiac surgery.

Enter prothrombin time, the lab control PT and bilirubin to get the discriminant function and see whether alcohol-associated hepatitis crosses the DF 32 steroid threshold.

Combine stool frequency, rectal bleeding, endoscopy and physician assessment into a 0 to 12 activity score, or drop the endoscopy item for the partial Mayo.

Padua score for VTE risk in hospitalized medical patients.

Five admission signs plus six at 48 hours give a mortality estimate for acute pancreatitis, with the score of 3 that flags severe disease.

Risk of Paradoxical Embolism (RoPE) score for cryptogenic stroke with PFO.

Grade rebleeding and mortality risk after an upper GI bleed, using age, shock and comorbidity alone or the complete score once endoscopy is done.

San Francisco Syncope Rule for predicting serious outcomes after syncope.

Alberta Stroke Program Early CT Score (ASPECTS) for early ischemic changes in stroke.

Seven findings put a suspected pulmonary embolism into low, moderate or high probability, so you know whether to send a D-dimer or go straight to CTA.

Ten clinical items, one of them worth minus two, give the pre-test probability of deep vein thrombosis and whether a D-dimer can settle it without ultrasound.

FIB-4 index for non-invasive liver fibrosis assessment.

Nine factors give the one-year major bleeding risk on anticoagulation for AF, and flag which of them (BP, alcohol, NSAIDs, labile INR) you can actually fix.

HEART Score for major adverse cardiac events in chest pain patients.

Model for End-Stage Liver Disease (MELD) and MELD-Na scores for cirrhosis prognosis.

National Early Warning Score 2 (NEWS 2) for clinical deterioration detection.

National Institutes of Health Stroke Scale (NIHSS) for stroke severity.

Pneumonia Severity Index (PSI/PORT) for mortality risk in community-acquired pneumonia.

Quick Sepsis-Related Organ Failure Assessment (qSOFA) for sepsis screening.

PT-INR, platelet count and a capped SOFA subscore decide whether sepsis-induced coagulopathy is present, catching it earlier than the overt DIC criteria.

Sequential Organ Failure Assessment (SOFA) score for ICU organ dysfunction.

Eight weighted variables give 30-day mortality after ST-elevation MI, from under 1 percent to well past 20, for triage and prognosis at the bedside.

Seven equal-weight criteria give the 14-day risk of death, MI or urgent revascularization in unstable angina and NSTEMI, steering the invasive versus conservative call.

GRACE score for in-hospital and 6-month mortality in acute coronary syndrome.

Arterial pH, bicarbonate and mental status grade a diabetic ketoacidosis episode mild, moderate or severe by whichever parameter is worst.

SCORAD Index for severity of atopic dermatitis.

Rate erythema, induration, scaling and area involved for head, arms, trunk and legs; the regional weights add up to a PASI from 0 to 72.

Pulmonary Embolism Severity Index (PESI) for 30-day mortality.

Four bedside signs (appearance, eyes, mucous membranes, tears) put a child with gastroenteritis on a 0 to 8 dehydration scale that guides rehydration.

Pick the highest indicator in each clinical process and the Larach scale ranks how likely an intraoperative event really was malignant hyperthermia, rank 1 to 6.

Crohn's Disease Activity Index (CDAI) for assessing Crohn's disease activity.

Bishop score for predicting successful labor induction.

Score vascular pattern, bleeding and erosions at the worst-affected segment for a 0 to 8 endoscopic index that beats the Mayo subscore on inter-observer reliability.

Weight MI timing, angina class, pulmonary edema and seven more factors into a Detsky class I to III for cardiac risk before non-cardiac surgery.

The original 1977 nine-factor index, scoring perioperative cardiac complication risk from S3 gallop, recent MI, arrhythmia and surgery type into classes I to IV.

Harvey-Bradshaw Index for Crohn's disease activity (simplified CDAI).

Grade the six body regions on the AIS scale; the three worst get squared and summed into the 0 to 75 trauma score where anything above 15 counts as major trauma.

Six yes-or-no criteria split acute PE into low risk (all absent, roughly 1 percent 30-day mortality) and high risk, the first gate for outpatient treatment.

ISS stage, high-risk FISH cytogenetics and serum LDH combine into R-ISS stage I, II or III for myeloma prognosis and trial stratification.

Eight bedside criteria that, all negative in an already low-risk patient, let you close out pulmonary embolism without a D-dimer or a scan.

Seven admission variables (BP, BUN, sodium, age, heart rate, race, COPD) map to in-hospital mortality in acute heart failure, from under 1 percent to over 50.

Total seven items to a maximum of 26; a score of 21 or more marks febrile neutropenia as low risk and opens the door to oral outpatient antibiotics.

Hemoglobin, base excess, vitals, FAST and fracture pattern give the probability that a trauma patient will need massive transfusion, so the protocol fires early.

Browse 1,035 exercises by muscle, equipment, and difficulty. Step-by-step instructions and a muscle map for every exercise — free, no sign-up.

Calculate running pace per km and per mile from distance and time, plus projected 5K, 10K, half and marathon finish times. Free, in your browser.

Calculate your pregnancy due date from LMP, conception date, or IVF transfer using Naegele’s rule, plus current gestational age and trimester.

Estimate basal metabolic rate from sex, age, height and weight, with Mifflin-St Jeor, Harris-Benedict and Katch-McArdle side by side.

Calculate total daily energy expenditure from BMR and activity level, with calorie targets for weight loss, maintenance and weight gain.

Convert CSV to JSON or JSON to CSV instantly. Auto-detects delimiters — supports comma, semicolon, and tab.

Paste a JSON array and instantly get a formatted Markdown table. Perfect for READMEs and documentation.

Bidirectional Markdown ↔ HTML converter. Paste content and get instant output — headings, lists, links, code blocks, and more.

Convert text to binary, hex, and decimal representations instantly.

Convert XML to JSON instantly in your browser. Handles attributes, nested elements, and repeated tags.

Convert Unix timestamps to human-readable dates and vice versa, with timezone support.

Convert pixels to rem and rem to pixels instantly. Configurable base font size with a common conversions reference table.

Convert between units of length, weight, temperature, data, speed, and more. Free, instant, no sign-up.

Calculate the optimal CSS line-height for any font size. Live preview and copy-ready CSS values.

Convert between px, pt, em, rem, and percent for CSS typography. Enter any value and see all units instantly.

Convert shoe, sneaker, and tennis shoe sizes between US, UK, EU, Brazil, Japan, Mexico, Australia, and cm. Men, women, and kids — instant and free.

Complete reference for paper sizes — A series, US Letter, Legal, Tabloid, and more. Search and filter by name or dimensions.

Convert date and time between time zones instantly. Compare multiple zones side by side.

Calculate exact age in years, months, and days from a birth date. Updates to today or any target date.

Parse and format ISO 8601 dates. Convert between ISO strings, local datetime, and Unix timestamps.

Find the ISO week number for any date. See week start, week end, and year-week label.

Count the working days between two dates, skipping weekends, so a five day SLA or a 30 day payment term lands on the right calendar day.

Add up hours worked from start and end times across a week, subtracting breaks, so a timesheet total is arithmetic rather than guesswork.

Pick a target date and see exactly how many days, hours and minutes are left, useful for a launch, a deadline or a contract renewal.

Turn CSV rows into a file Excel opens with the columns already split, avoiding the import wizard and the mangled dates it usually produces.

Switch a file between commas, semicolons, tabs and pipes, for when Excel in a European locale refuses to open a comma separated file correctly.

Rename and reorder CSV headers to match the columns an importer expects, so a spreadsheet from one system loads into another without hand editing.

Flip rows into columns and columns into rows, for when data arrives the wrong way round for the chart or the import you need it for.

Give a start and end time to keep one section of an MP3, WAV, or FLAC file, then download just that piece as a new track.

Pick a target bitrate and re-encode down to it. Taking a spoken-word track from 320 to 96 kbps cuts the file by roughly two thirds.

Line up MP3, WAV, or OGG tracks in whatever order you want and stitch them into a single file with no silence dropped in between.

Set fade in and fade out lengths in seconds so a track eases in and ends without a hard cut. Total duration tells it where the tail sits.

Speed a track up or slow it down, then download the retimed file. Built for lecture recordings, practice loops, and audiobook pacing.

Amplify a quiet recording by a set number of decibels and download the louder file, so an interview taken at arms length becomes audible.

Turn a stack of WebP files into PNGs with transparency intact, for the apps and CMSes that still refuse to read WebP.

Convert JPG photos to PNG in one pass, so every later edit and re-save avoids stacking another round of lossy compression.

Convert square feet to square meters, acres to hectares, and every common area unit instantly. Free area converter that runs in your browser.

Convert liters to gallons, cups to milliliters, and every common volume unit instantly. Free volume converter that runs entirely in your browser.

Convert psi to bar, kPa to psi, atmospheres, torr, and mmHg instantly with NIST conversion factors. Free pressure converter, runs in your browser.

Convert joules to calories, kWh to BTU, electronvolts, and foot-pounds instantly with NIST factors. Free energy converter, runs in your browser.

Convert horsepower to kilowatts, watts to BTU/h, and tons of refrigeration instantly with NIST factors. Free power converter in your browser.

Convert newtons to pounds-force, kilograms-force, dynes, and poundals instantly with exact NIST factors. Free force converter in your browser.

Convert newton-meters to foot-pounds, inch-pounds, and kgf·m instantly with exact NIST factors. Free torque unit converter in your browser.

Convert m/s² to g-force, ft/s², Gal, and km/h per second instantly with exact NIST factors. Free acceleration unit converter in your browser.

Convert kg/m³ to g/cm³, lb/ft³, lb/in³, and kg/L instantly with exact NIST-derived factors. Free density unit converter in your browser.

Convert degrees to radians, gradians, arcminutes, arcseconds, and turns instantly. Free angle unit converter that runs entirely in your browser.

Convert hertz to kilohertz, megahertz, RPM, and radians per second instantly. Free frequency unit converter that runs entirely in your browser.

Convert Mbps to MB/s, Gbps to Mbps, and MiB/s instantly — decimal and binary prefixes handled correctly. Free bandwidth converter in your browser.

Convert moles to millimoles, micromoles, kilomoles, and pound-moles instantly. Free amount-of-substance converter that runs in your browser.

Convert molar mass between g/mol, kg/mol, kg/kmol, daltons, and lb/lb-mol instantly. Free molar mass unit converter that runs in your browser.

Convert dynamic viscosity between Pa·s, poise, centipoise, and lbf·s/ft² instantly with NIST factors. Free viscosity converter in your browser.

Convert kinematic viscosity between m²/s, stokes, centistokes, and ft²/s instantly with exact NIST factors. Free viscosity converter in your browser.

Convert mass flow between kg/s, kg/h, tonnes per hour, lb/s, and lb/h instantly with exact NIST factors. Free flow rate converter in your browser.

Convert volumetric flow between L/min, GPM, CFM, m³/h, and L/s instantly with exact NIST factors. Free flow rate converter in your browser.

Convert capacitance between farads, microfarads, nanofarads, and picofarads instantly. Free capacitance unit converter that runs in your browser.

Convert electric charge between coulombs, ampere-hours, and milliamp-hours instantly. Free charge unit converter for battery and electronics work.

Convert electric current between amps, milliamps, microamps, and kiloamps instantly. Free current unit converter that runs in your browser.

Convert electric potential between volts, millivolts, microvolts, kilovolts, and megavolts instantly. Free voltage unit converter in your browser.

Convert electrical conductance between siemens, millisiemens, microsiemens, and mho instantly. Free conductance unit converter in your browser.

Convert electrical resistance between ohms, kiloohms, megaohms, and gigaohms instantly. Free resistance unit converter that runs in your browser.

Convert inductance between henries, millihenries, microhenries, and nanohenries instantly. Free inductance unit converter that runs in your browser.

Convert magnetic flux density between tesla, gauss, millitesla, and gamma instantly — 1 T = 10,000 G exactly. Free converter in your browser.

Convert magnetic field strength H between amperes per meter and oersteds instantly — 1 Oe = 1000/4π A/m. Free converter in your browser.

Convert magnetic flux between webers, milliwebers, and maxwells instantly — 1 Wb = 10⁸ Mx exactly. Free flux unit converter in your browser.

Convert magnetomotive force between ampere-turns and gilberts instantly — 1 Gb = 10/4π At exactly. Free MMF unit converter in your browser.

Convert illuminance between lux, foot-candles, and phots instantly — 1 fc = 10.764 lx exactly. Free lighting unit converter in your browser.

Convert luminance between cd/m² (nits), foot-lamberts, stilbs, and lamberts instantly with exact NIST factors. Free converter in your browser.

Convert luminous energy between lumen-seconds, talbots, lumen-minutes, and lumen-hours instantly. Free photometry unit converter in your browser.

Convert luminous flux between lumens, kilolumens, millilumens, and candela-steradians instantly. Free photometry unit converter in your browser.

Convert luminous intensity between candela, millicandela, and candlepower instantly — LED mcd ratings included. Free converter in your browser.

Convert absorbed radiation dose between grays, milligrays, and rads instantly — 1 Gy = 100 rad exactly. Free dose unit converter in your browser.

Convert equivalent radiation dose between sieverts, millisieverts, and rems instantly — 1 Sv = 100 rem exactly. Free converter in your browser.

Convert radioactivity between becquerels, megabecquerels, curies, and millicuries instantly — 1 Ci = 3.7×10¹⁰ Bq. Free converter in your browser.

Convert fuel economy between US MPG, UK MPG, L/100km, and km/L instantly. Free fuel consumption converter that runs entirely in your browser.

Convert wind speed between knots, mph, km/h, and m/s and read the Beaufort scale force with description. Free wind converter in your browser.

Enter a tire size like 205/55R16 to get diameter, sidewall, and circumference — and compare two sizes with speedometer error. Free, in-browser.

Turn a diagonal size and aspect ratio into real width, height, area, and PPI for TVs and monitors — inches and centimeters. Free, in-browser.

Convert clothing sizes between US, UK, EU, Italian, and Japanese charts for women’s dresses, men’s suits, and shirts. Free, in your browser.

Convert hat sizes between head circumference in cm or inches, US and UK numeric sizes, and S/M/L letters. Free hat size converter in your browser.

Count the days between two dates, with a years-months-days breakdown, weeks, hours, and business days that skip weekends.

Test regular expressions with live match highlighting.

Format, minify and validate JSON instantly.

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text input instantly.

Decode and inspect JWT tokens instantly — view header, payload, and signature.

Generate cryptographically secure passwords with custom length, character sets, and strength check. Fully offline — no data ever leaves your browser.

Generate HTML meta tags for SEO and social sharing. Covers title, description, canonical, Open Graph, and Twitter Card tags.

Generate a valid robots.txt file for your website. Control which bots can crawl your pages, block AI scrapers, and add your sitemap URL.

Generate JSON-LD structured data for Article, Product, FAQ, HowTo, LocalBusiness, and more. Copy and paste into your HTML head.

Paste page HTML to audit title, description, canonical, Open Graph, and Twitter tags. Paste-only — cannot fetch live URLs.

Paste robots.txt and test if a URL path is allowed or blocked for a crawler. Paste-only — cannot fetch live robots.txt.

Paste sitemap XML to validate structure, URLs, and duplicates. Does not fetch live sitemaps or check HTTP status codes.

Paste JSON-LD to validate syntax and required schema.org fields. Paste-only — cannot fetch live pages or replace Google Rich Results Test.

Generate cryptographically secure API keys in hex, base64, or alphanumeric formats. Runs offline in your browser.

Generate one or many UUIDs instantly — supports v1, v4, and v5.

Build and decode cron expressions with a visual editor.

Convert numbers between decimal, hexadecimal, binary, and octal instantly. Supports integers and fractions.

Estimate per-request cost for GPT-4o, Claude, Gemini, and more. Enter token counts and see input, output, and total pricing.

Quick reference for Tailwind CSS classes — spacing, typography, colors, flexbox, grid, and more. Search and copy any class.

Format and beautify SQL queries instantly. Paste messy SQL and get indented, readable output.

Build cURL commands from URL, method, headers, and body. Copy-ready curl for any HTTP request.

Check password strength with entropy scoring and crack-time estimates. See what makes a password weak or strong.

Generate HMAC signatures with SHA-256, SHA-384, or SHA-512. Enter message and secret key — runs in your browser.

See how much of a model context window your text uses. Compare GPT-4o, Claude, and Gemini token limits.

Convert cURL commands to JavaScript fetch() code. Paste curl and get copy-ready fetch syntax.

Convert cURL commands to Python requests code. Paste curl and get copy-ready Python.

Generate Postman Collection v2.1 JSON from URL, method, headers, and body. Import directly into Postman.

Validate JSON data against a JSON Schema. Paste instance and schema to see errors instantly.

Test prompt templates with variables. Enter {{placeholders}} and preview the filled prompt instantly.

Estimate embedding API costs for OpenAI, Cohere, and Voyage. Enter token count and see per-request pricing.

Generate SQL INSERT statements from JSON arrays. Paste JSON and get copy-ready INSERT queries. Free, runs in your browser.

Generate CREATE TABLE SQL from JSON schema or sample rows. Infer column types instantly. Free browser tool.

Calculate RAG chunk count from token total, chunk size, and overlap. Plan vector indexing splits in your browser.

Compare LLM API costs across OpenAI, Claude, and Gemini for the same token counts. Free browser calculator.

Extract JSON from LLM responses. Parse fenced code blocks and inline objects from pasted model output.

Identify hash types from pasted digests. Detect MD5, SHA-256, bcrypt, and more. Paste only, runs in browser.

Validate IBAN numbers with mod-97 check digits. Paste an IBAN to verify format and checksum. Free browser tool.

Validate numbers with the Luhn algorithm. Check credit card and identifier check digits. Paste only, in browser.

Audit pasted JWT tokens for security issues. Flag alg none, expiry, and missing claims. Runs in your browser.

Beautify and indent pasted HTML for readability. Format messy markup instantly. Free, runs in your browser.

Parse URLs into protocol, host, path, query, and hash components. Paste any URL for instant breakdown.

Infer a JSON Schema from a sample document, giving you types, required fields and nested structures as a draft to tighten by hand.

Put two prompts side by side and see exactly which words changed, so you know what you actually varied before blaming the model for the difference.

Track a prompt across revisions and see what each edit changed, which is the only way to attribute an output shift to the edit that caused it.

Paste the JSON or Markdown a model handed back with its stray prose, code fences and trailing commas, and get a clean, indented block out.

Assemble a SELECT from tables, columns, joins and conditions and read the SQL it produces, which is a faster way to learn joins than staring at syntax.

Turn a CSV into INSERT statements with a table name you choose, quoting strings and leaving numbers bare so the script runs as written.

Pull the values out of a block of INSERT statements and get CSV rows back, for when a dump is all you have and you need the data in a spreadsheet.

Paste a schema and get an entity relationship diagram back, with the foreign keys drawn as the links between tables rather than left in the DDL.

Translate MongoDB documents into relational rows, mapping nested fields to columns so a collection can be loaded into a SQL table.

Assemble a request from method, URL, headers and body, then take it away as a raw HTTP message or as a cURL command ready to paste in a terminal.

Describe the shape you want and get a JSON response body to point a client at, so front-end work can start before the real endpoint exists.

Paste a webhook body and see it parsed into a readable tree, with the headers and signature fields separated from the event data.

Paste two hashes and get a straight match or no match, instead of squinting at 64 hex characters and trusting your eyes.

Hash a file or a string with MD5, SHA-1, SHA-256 or SHA-512 and compare it against a published checksum to confirm the download arrived intact.

Paste a certificate and read the subject, issuer, validity window, subject alternative names and key details in plain text.

Generate an RSA key pair and the matching certificate signing request in your browser, with the private key never leaving the page.

Decode a PEM block and read what is inside it: certificate subject and dates, key parameters, or the fields of a signing request.

Paste a PEM certificate and see the not-before and not-after dates, plus how many days are left, before a renewal quietly slips past.

Open a Chrome extension file and read what is inside it: the manifest, every permission in plain English, and the full source of every file.

Paste HTML and see it rendered next to the source, so you can check a fragment or an email template without saving a file and reloading.

Paste minified or badly indented CSS and get it back with one declaration per line, consistent indentation and the braces where you expect them.

Strip comments, whitespace and line breaks out of JavaScript to cut the bytes a browser has to download, without touching what the code does.

Check markup for unclosed tags, badly nested elements and misplaced block content, the structural errors browsers silently paper over.

Set columns, rows and gap visually and copy the grid-template-columns and grid-template-rows rules straight into your stylesheet.

Set justify-content, align-items, direction and wrap against a live preview and copy the flexbox rules once the layout looks right.

Check XML is well formed, catching unclosed tags, mismatched element names and stray characters that break a parser before it reads any content.

Check YAML parses, and catch the indentation and tab errors that make a config file fail at deploy time rather than at the moment you saved it.

Convert TOML config into JSON and back, for when a tool wants one format and your config lives in the other.

Paste flattened or badly indented XML and get it back with each element on its own line and nesting you can actually follow.

Turn a deeply nested object into flat dot-notation keys, the shape config loaders, feature flags and spreadsheets all expect.

Run a JSONPath expression against your own document and see the matches highlighted, so you can get the selector right before it goes into code.

Escape HTML special characters to entities or decode them back, covering named, decimal, and hexadecimal references without touching innerHTML.

Pick random numbers in any range using the browser cryptographic random source. Integers or decimals, with or without repeats.

Percent-encode text for a URL or decode %20 and %C3%A9 back to readable characters, with a toggle between encodeURIComponent and encodeURI.

Preview a page at the iPhone Duo's folded and unfolded CSS viewports, side by side, with the breakpoint each state lands on.

Calculate monthly mortgage payments, total interest, and full amortization schedule. Enter loan amount, rate, and term.

Calculate monthly loan payments and total interest for personal, auto, or business loans. See full amortization schedule.

Calculate compound interest with monthly contributions. See balance growth over time with a year-by-year breakdown.

Calculate compound annual growth rate between two values over any time period. Instant CAGR percentage.

Calculate years to financial independence using the 4% rule. Enter savings, expenses, income, and savings rate.

See how inflation erodes purchasing power. Enter an amount and year range using historical US CPI data.

Calculate weighted average share price across multiple purchases. Enter shares and price per lot.

Model dollar-cost averaging with recurring investments. See average cost per share and total invested.

Discount a stream of future cash flows back to today at a rate you choose, and see the net present value plus what each year contributes.

Work back from the money you are willing to lose and your stop distance to the position size that risks exactly that and no more.

Enter buy price, sell price and position size to see profit, loss and percentage return, with fees taken off both ends of the trade.

Calculate simple interest with I = P·r·t. Enter principal, rate, and time in years, months, or days — compare against annual compounding.

See how long paying off a credit card takes and what it costs. Compare your monthly payment against minimum payments at your APR.

Find your loan payoff date and what extra monthly payments save — months cut and interest saved, side by side with your current plan.

Should you refinance? Compare current vs new rate and term: monthly savings, break-even point on closing costs, and lifetime savings.

Plan your debt-free date. List balances, APRs, and minimums, add an extra budget, and compare snowball vs avalanche strategies.

Compare renting vs buying a home over your time horizon — mortgage, taxes, maintenance, and appreciation against rent growth and investing.

Use the HP 12C financial calculator online: RPN keys, TVM, NPV, IRR, amortization, bonds and programs, with a live stack and paper tape.

Calculate gross profit, net profit, and margin percentage from revenue and costs. Updates instantly.

Find your break-even point in units and revenue. Enter fixed costs, price per unit, and variable cost per unit.

Convert salary between annual, monthly, bi-weekly, weekly, daily, and hourly rates. Adjust for hours and weeks worked.

Calculate return on investment percentage from initial cost and final value. See profit and ROI instantly.

Estimate Amazon referral fees, FBA fees, and net profit per sale. Enter price, category, and fulfillment method.

Calculate Etsy listing, transaction, payment processing, and shipping fees. See net profit per sale instantly.

Calculate sales commission from deal value and commission rate. Supports flat rate and tiered percentages.

Convert desired annual salary to an hourly contractor rate. Factor in billable hours, expenses, and tax buffer.

Calculate selling price from cost and markup or margin. See profit per unit instantly.

Calculate invoice due dates from issue date and payment terms. Net 30, Net 60, or custom days.

Calculate final price after stacked Shopify discounts. Enter original price and multiple discount percentages.

Validate GTIN, EAN-13, and UPC barcodes. Verify check digits and format. Free, runs in your browser.

Produce a sequence of invoice numbers with a prefix, a year segment and zero padding, so the numbering stays consistent and sortable.

Fill in supplier, line items and totals and get a purchase order you can send, with the PO number and dates laid out where a supplier expects them.

Feed it a word or two about what you do and get name candidates back, so you have a list to react to instead of a blank page.

Work out the selling price that survives an exchange rate, a payment processor cut and the margin you actually want to keep on a cross-border sale.

Estimate a shipping charge from weight, dimensions and destination, including the dimensional weight carriers bill when a box is light but bulky.

Build SKU codes from attributes such as category, colour and size, using a consistent segment order so a code stays readable across a catalogue.

Estimate how long it takes to read any text — shows slow, average, and fast reading times.

Count AI tokens for GPT-4o, Claude, Gemini, and more. Paste text and see estimated token, word, and character counts instantly.

Write markdown and preview the output in real time.

Build Markdown tables visually with a grid editor. Set alignment, add rows and columns, copy the output.

A quick text editor with find & replace, case transforms (uppercase, lowercase, title case), slug generation, and more.

Browse, search, and copy Unicode characters by category. Find arrows, math symbols, emojis, and special glyphs instantly.

Generate lorem ipsum placeholder text instantly.

Generate Mussum Ipsum placeholder text — a Brazilian lorem ipsum full of invented words and humor.

Generate Dilmes Ipsum placeholder text using real quotes from former Brazilian president Dilma Rousseff.

Click any emoji to instantly copy it to your clipboard. Search and browse 2,300+ Unicode emojis by category.

Count words, characters, sentences, and paragraphs in real time. Paste or type any text.

Run several line transforms on one paste without switching tabs. Sort, dedupe, shuffle, and change case in a single pass over the same text.

Convert text to uppercase, lowercase, title case, sentence case, camelCase, snake_case, kebab-case, and CONSTANT_CASE as you type.

Alphabetize a list A to Z or Z to A, sort it numerically or by line length, reverse it, or shuffle it, with natural sort so item2 comes before item10.

Full-featured scientific calculator with trigonometry, logarithms, exponents, and expression history.

Plot mathematical functions on an interactive graph. Supports multiple equations, zoom, pan, and real-time updates.

Simplify expressions, factor polynomials, solve equations, and compute derivatives. Renders math with LaTeX.

Calculate percentages, increases, decreases, proportions, and find original values before percentage changes. 9 calculation types.

Calculate GPA from letter grades and credit hours on a 4.0 scale. Add courses and see weighted GPA instantly.

Calculate weighted course grade from assignment scores and weights. See your overall percentage instantly.

Calculate the final exam score you need to reach your target course grade. Enter current grade and final weight.

Estimate reading grade level with Flesch-Kincaid. Paste text to see grade level, reading ease, and word count.

Fill in author, title, publisher and date and get a formatted reference in APA or MLA, punctuation and italics already in the right places.

Turn a list of questions and answers into Markdown that Anki, Obsidian or Notion will read as cards rather than as one undifferentiated block.

Convert numbers to Roman numerals and back, following the subtractive rules so 4 comes out as IV and 1994 as MCMXCIV rather than as a row of ones.

Translate Excel function names between English, Portuguese, and Spanish. Search 375 functions — VLOOKUP is PROCV in pt-BR, BUSCARV in Spanish.

Use the HP 15C scientific calculator online: RPN keys, complex numbers, matrices, SOLVE, numeric integration and programs, with a live stack.

Generate CSS gradients visually with live preview.

Generate color shades and Tailwind CSS palettes from a single hex color. Export as CSS variables, Tailwind config, or design tokens.

Generate beautiful color palettes with 28 strategies — color theory, moods, decades, nature, and culture. Lock, export, download.

Generate a full Tailwind CSS color palette (50-950) from any hex color. Export as CSS variables or Tailwind config.

Generate complementary, triadic, analogous, split-complementary, and more color harmonies from any base color.

Browse a curated collection of beautiful color palettes. Filter by mood, search by color, and copy hex values instantly.

Convert colors between HEX, RGB, HSL, OKLCH, and LAB formats instantly. Includes a live color picker preview.

Check color contrast ratios for WCAG AA and AAA compliance. Test foreground and background colors for accessibility.

Create realistic WhatsApp chat screenshots. Edit messages inline, toggle dark mode, download as PNG.

Create realistic iMessage chat screenshots. Blue and gray bubbles, delivered/read receipts, download as PNG.

Create realistic Discord chat screenshots. Server-style messages with avatars, timestamps, and reactions.

Create realistic Instagram DM screenshots. Purple gradient header, heart reactions, disappearing messages.

Create realistic ChatGPT conversation screenshots. User prompts and AI responses with the official ChatGPT UI.

Create realistic X/Twitter post screenshots. Profile, tweet text, likes, retweets, and reply counts.

Create realistic Gmail email screenshots. From, to, subject, body with the official Gmail UI.

Build UTM-tagged URLs for Google Analytics campaign tracking. Add source, medium, and campaign parameters to any link.

Calculate A/B test statistical significance. Enter control and variant visitors and conversions to see p-value, lift, and significance.

Calculate marketing campaign ROI, ROAS, and profit. Enter revenue and ad spend for instant results.

Calculate customer acquisition cost, lifetime value, LTV:CAC ratio, and payback period for your marketing funnel.