How to convert rads to grays
Gy = rad × 0.01Multiply the value in rads by 0.01. To go the other way, multiply by 100 (or divide by 0.01).
A rad is smaller than a gray: it takes 100 rads to make one gray.
Worked examples
- 1 rad1 rad × 0.01 = 0.01 Gy
- 5 rads5 rad × 0.01 = 0.05 Gy
- 10 rads10 rad × 0.01 = 0.1 Gy
- 20 rads20 rad × 0.01 = 0.2 Gy
- 100 rads100 rad × 0.01 = 1 Gy
Rads to grays conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Rads (rad) | Grays (Gy) |
|---|---|
| 0.1 rad | 0.001 Gy |
| 0.25 rad | 0.0025 Gy |
| 0.5 rad | 0.005 Gy |
| 1 rad | 0.01 Gy |
| 2 rad | 0.02 Gy |
| 3 rad | 0.03 Gy |
| 4 rad | 0.04 Gy |
| 5 rad | 0.05 Gy |
| 6 rad | 0.06 Gy |
| 7 rad | 0.07 Gy |
| 8 rad | 0.08 Gy |
| 9 rad | 0.09 Gy |
| 10 rad | 0.1 Gy |
| Rads (rad) | Grays (Gy) |
|---|---|
| 12 rad | 0.12 Gy |
| 15 rad | 0.15 Gy |
| 20 rad | 0.2 Gy |
| 25 rad | 0.25 Gy |
| 30 rad | 0.3 Gy |
| 40 rad | 0.4 Gy |
| 50 rad | 0.5 Gy |
| 75 rad | 0.75 Gy |
| 100 rad | 1 Gy |
| 250 rad | 2.5 Gy |
| 500 rad | 5 Gy |
| 1,000 rad | 10 Gy |
About the units
Rad (rad)
100 erg/g, exactly 0.01 Gy.
Gray (Gy)
One joule of radiation energy absorbed per kilogram.
Frequently asked questions
How many grays are in one rad?
There are 0.01 grays in one rad, and this value is exact by definition.
How do I convert rads to grays?
Multiply the number of rads by 0.01. For example, 10 rad × 0.01 = 0.1 Gy.
How many rads are in one gray?
One gray equals 100 rads. That is the reverse factor, 1 ÷ 0.01.
What is 10 rads in grays?
10 rad = 0.1 Gy.
Is this rad to Gy converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.