Convert rad to gray instantly. Type in either field — results update live.
Selected rad values converted to Gy using the exact factor from this tool.
| rad | Gy |
|---|---|
| 0.01 | 0.0001 |
| 0.1 | 0.001 |
| 1 | 0.01 |
| 2 | 0.02 |
| 3 | 0.03 |
| 5 | 0.05 |
| 10 | 0.1 |
| 20 | 0.2 |
| 50 | 0.5 |
| 100 | 1 |
| 1,000 | 10 |
Exact conversion factors in both directions, plus a worked example.
1 rad = 0.01 Gy
1 Gy = 100 rad
To convert rad to gray, multiply by 0.01.
To convert gray to rad, multiply by 100.
Example: convert 10 rad to Gy
10 × 0.01 = 0.1 Gy
Short background on the units used in this conversion.
The rad equals 0.01 gray — the legacy CGS unit of absorbed dose, still common in US clinical radiology.
Rads label patient dose on older equipment, regulatory limits, and clinical radiography — the most searched absorbed-dose conversion with gray.
The gray (Gy) equals one joule per kilogram of absorbed dose — the SI unit of energy deposited by ionizing radiation per unit mass.
Grays quantify absorbed dose in radiotherapy, CT dosimetry, and radiation biology — 1 gray = 100 rad.
Gy = rad × 0.01rad = Gy × 100, using the same exact factors as this converter.