Quick reference table
Common radiation absorbed dose conversions
| From | To |
|---|---|
| 1 rad | 0.01 Gy |
| 1 Gy | 1 rad |
| 1 mGy | 1 mrad (dose) |
| 1 kGy | 1,000 Gy |
How to convert radiation absorbed dose
Absorbed dose is the energy deposited by radiation per kilogram of material. The SI unit is the gray (Gy), and the older unit is the rad.
Every radiation absorbed dose unit is a fixed multiple of one base unit, the Gy. To convert a value, multiply it by the size of the starting unit and divide by the size of the target unit. For example, to convert rad to Gy, multiply by 0.01. To go the other way, divide by 0.01.
The converter above does this for you and shows the exact formula under the result.
Worked examples
Rads to Grays
| Rads (rad) | Grays (Gy) |
|---|---|
| 1 rad | 0.01 Gy |
| 2 rad | 0.02 Gy |
| 5 rad | 0.05 Gy |
| 10 rad | 0.10 Gy |
| 25 rad | 0.25 Gy |
| 50 rad | 0.50 Gy |
| 100 rad | 1.00 Gy |
| 1,000 rad | 10.00 Gy |
Grays to Rads
| Grays (Gy) | Rads (rad) |
|---|---|
| 1 Gy | 1 rad |
| 2 Gy | 2 rad |
| 5 Gy | 5 rad |
| 10 Gy | 1 rad |
| 25 Gy | 25 rad |
| 50 Gy | 5 rad |
| 100 Gy | 1 rad |
| 1,000 Gy | 1 rad |
Radiation absorbed dose units explained
| Unit | Symbol | Equals |
|---|---|---|
| Nanograys | nGy | 1 nGy = 1 × 10⁻⁹ Gy |
| Micrograys | µGy | 1 µGy = 0.000001 Gy |
| Milligrays | mGy | 1 mGy = 0.001 Gy |
| Grays | Gy | 1 Gy = 1 Gy |
| Kilograys | kGy | 1 kGy = 1,000 Gy |
| Rads | rad | 1 rad = 0.01 Gy |
| Millirads | mrad (dose) | 1 mrad (dose) = 0.00001 Gy |
| Joules per kilogram | J/kg | 1 J/kg = 1 Gy |
| Ergs per gram | erg/g | 1 erg/g = 0.0001 Gy |
Popular conversions: rad to gray, gray to rad.
Frequently asked questions
How many rads is 1 gray?
One gray is 100 rads.
How do I convert rad to Gy?
Multiply the value in rad by 0.01 to get Gy. For example, 10 rad = 0.10 Gy.
How many Gy is 1 rad?
1 rad = 0.01 Gy, and 1 Gy = 1 rad.
Does this radiation absorbed dose converter work offline?
Yes. After the page has loaded once, all calculations run in your browser, so it keeps working without an internet connection.