Pressure Converter — PSI, Bar, kPa & Atm

Convert between psi, bar, kilopascals, atmospheres, torr, and mmHg using NIST SP 811 factors.

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How this conversion works. Every unit is converted through the pascal (SI) with conversion factors from NIST Special Publication 811.

How to use

  1. Pick the unit you are converting from, such as Pascal (Pa) or Kilopascal (kPa).
  2. Type the value and every other unit updates as you type.
  3. Copy the figure you need, or use the swap button to reverse the direction, Kilogram-force per cm² (kgf/cm²) included.

Frequently asked questions

How do I convert psi to bar?

1 psi = 0.0689476 bar. Choose "PSI (lbf/in²)" as From and "Bar (bar)" as To, type a value, and the result updates instantly.

How many psi is 1 bar?

1 bar = 14.503774 psi, and 1 psi = 0.0689476 bar. Tire pressures around 32 psi are roughly 2.2 bar.

What is the difference between torr and mmHg?

They differ by less than 0.000015%. The torr is defined as exactly 1/760 atm; the conventional mmHg is 133.322387415 Pa. For lab work they are interchangeable.

Is my data sent to a server?

No. Conversions run entirely in your browser using fixed factors — nothing is uploaded or logged.

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