How to convert grays to rads
rad = Gy × 100Multiply the value in grays by 100. To go the other way, multiply by 0.01 (or divide by 100).
A gray is larger than a rad: one gray contains 100 rads.
Worked examples
- 1 gray1 Gy × 100 = 100 rad
- 5 grays5 Gy × 100 = 500 rad
- 10 grays10 Gy × 100 = 1,000 rad
- 20 grays20 Gy × 100 = 2,000 rad
- 100 grays100 Gy × 100 = 10,000 rad
Grays to rads conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Grays (Gy) | Rads (rad) |
|---|---|
| 0.1 Gy | 10 rad |
| 0.25 Gy | 25 rad |
| 0.5 Gy | 50 rad |
| 1 Gy | 100 rad |
| 2 Gy | 200 rad |
| 3 Gy | 300 rad |
| 4 Gy | 400 rad |
| 5 Gy | 500 rad |
| 6 Gy | 600 rad |
| 7 Gy | 700 rad |
| 8 Gy | 800 rad |
| 9 Gy | 900 rad |
| 10 Gy | 1,000 rad |
| Grays (Gy) | Rads (rad) |
|---|---|
| 12 Gy | 1,200 rad |
| 15 Gy | 1,500 rad |
| 20 Gy | 2,000 rad |
| 25 Gy | 2,500 rad |
| 30 Gy | 3,000 rad |
| 40 Gy | 4,000 rad |
| 50 Gy | 5,000 rad |
| 75 Gy | 7,500 rad |
| 100 Gy | 10,000 rad |
| 250 Gy | 25,000 rad |
| 500 Gy | 50,000 rad |
| 1,000 Gy | 100,000 rad |
About the units
Gray (Gy)
One joule of radiation energy absorbed per kilogram.
Rad (rad)
100 erg/g, exactly 0.01 Gy.
Frequently asked questions
How many rads are in one gray?
There are 100 rads in one gray, and this value is exact by definition.
How do I convert grays to rads?
Multiply the number of grays by 100. For example, 10 Gy × 100 = 1,000 rad.
How many grays are in one rad?
One rad equals 0.01 grays. That is the reverse factor, 1 ÷ 100.
What is 10 grays in rads?
10 Gy = 1,000 rad.
Is this Gy to rad 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.