Gray to Rad Converter — Absorbed Radiation Dose

Convert absorbed dose between grays, milligrays, centigrays, and rads.

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How this conversion works. Absorbed dose is converted through the gray (1 J/kg); the rad relation (1 Gy = 100 rad exactly) follows US NRC — Measuring Radiation. Unit conversion only — this does not assess dose, risk, or safety, and is not medical advice.

How to use

  1. Pick the unit you are converting from, such as Kilogray (kGy) or Gray (Gy).
  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, Millirad (mrad) included.

Frequently asked questions

How do I convert gray to rad?

1 gray = 100 rad. Choose "Gray (Gy)" as From and "Rad (rad)" as To, type a value, and the result updates instantly.

How many rads are in a gray?

Exactly 100 — both measure energy absorbed per mass (1 Gy = 1 J/kg = 100 rad). Radiotherapy uses cGy because 1 cGy = 1 rad, easing the transition from older records.

What is the difference between absorbed and equivalent dose?

Absorbed dose (Gy, rad) is raw energy deposited. Equivalent dose (Sv, rem) weights it by radiation type for biological effect. Same numbers for X-rays; very different for alpha particles.

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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