Grays to Rads Converter
1 gray = 100 rads
Unrelated to the radian, the unit of angle.
1 gray equals 100 rads
How to convert grays to rads
Absorbed dose is deposited energy per mass: 1 Gy = 1 J/kg and 1 rad = 0.01 Gy. Converting to sieverts requires radiation weighting information, rather than a universal unit factor.
rad = Gy × 100One gray is 100 rads, so a single multiplication converts any value.
1,000 rad = 10 × 100Unrelated to the radian, the unit of angle.
Grays to rads conversion table
Common values in grays, converted to rads.
| Grays (Gy) | Rads (rad) |
|---|---|
| 1 | 100 |
| 2 | 200 |
| 3 | 300 |
| 4 | 400 |
| 5 | 500 |
| 10 | 1,000 |
| 20 | 2,000 |
| 25 | 2,500 |
| 50 | 5,000 |
| 100 | 10,000 |
| 250 | 25,000 |
| 500 | 50,000 |
| 1,000 | 100,000 |
About these units
grayGy
The SI unit of absorbed dose: one joule of radiation energy per kilogram.
radrad
The legacy unit of absorbed dose: exactly 0.01 gray.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.