maratoolHow to convert gray to rad (absorbed dose)
Type an absorbed dose — read Gy, cGy, mGy, or rad instantly.
US regulatory documents still cite rads while international and clinical practice uses grays. The Gray to Rad Converter applies the exact 1:100 relation.
How it works
- Pick units — "Gray (Gy)" to "Rad (rad)", or any other pair.
- Type a value — the result updates as you type, with swap and copy.
- Copy — one click, with "Copied!" feedback.
Absorbed dose conversion factors
Every unit converts through the gray (the base unit). To convert A → B, multiply by A's factor and divide by B's:
| Unit | = this many grays |
|---|---|
| Kilogray (kGy) | 1,000 |
| Gray (Gy) | 1 |
| Centigray (cGy) | 0.01 |
| Milligray (mGy) | 0.001 |
| Microgray (µGy) | 1.0000 × 10^-6 |
| Rad (rad) | 0.01 |
| Millirad (mrad) | 1.0000 × 10^-5 |
When you need it
Scale: a chest CT deposits ~7 mGy (0.7 rad) locally; a radiotherapy course delivers 60 Gy (6,000 rad) in fractions to the target volume; food irradiation runs into kilograys. This page converts units only — interpreting a dose requires the exposure context.
Sources & methodology
Conversion factors follow US NRC — Measuring Radiation; exact-by-definition factors are marked in the tool itself. All math runs client-side in your browser — nothing is uploaded. Unit conversion only — this does not assess dose, risk, or safety, and is not medical advice.
More conversion guides
- How to convert sieverts to rem (equivalent dose)
- How to convert becquerels to curies (radioactivity)
- How to convert calories, joules, kWh, and BTU
Or browse everything at once in the new unit & sizing converters roundup.