Rad (absorbed dose) to Gray Converter
1 rad is exactly 0.01 grays. Convert rads (rd) to grays (Gy) below: type a value and the result updates as you type.
rd to Gy calculator
Result
Rad (absorbed dose) to Gray conversion
1 rd = 0.01 Gyone rad in grays
1 Gy = 100 rdone gray in rads
Rad (absorbed dose) (rd): Older unit of absorbed dose: exactly 0.01 Gy. Its symbol is often written "rad" (not to be confused with the radian).
Gray (Gy): SI unit of absorbed dose: one joule of radiation energy absorbed per kilogram of matter.
Source:Rad (absorbed dose): NIST Special Publication 811 (2008), Appendix B.8; Gray: SI Brochure, 9th edition (BIPM, 2019)
How to convert rads to grays
To convert rads to grays, multiply the number of rads by 0.01.
Formula
Gy = rd × 0.01
Examples
- 5 rd = 5 × 0.01 = 0.05 Gy
- 25 rd = 25 × 0.01 = 0.25 Gy
- 100 rd = 100 × 0.01 = 1 Gy
Rad (absorbed dose) to Gray conversion table
| Rad (absorbed dose) (rd) | Gray (Gy) |
|---|---|
| 0.1 rd | 0.001 Gy |
| 0.5 rd | 0.005 Gy |
| 1 rd | 0.01 Gy |
| 2 rd | 0.02 Gy |
| 3 rd | 0.03 Gy |
| 5 rd | 0.05 Gy |
| 10 rd | 0.1 Gy |
| 20 rd | 0.2 Gy |
| 25 rd | 0.25 Gy |
| 50 rd | 0.5 Gy |
| 100 rd | 1 Gy |
| 250 rd | 2.5 Gy |
| 500 rd | 5 Gy |
| 1000 rd | 10 Gy |
Values rounded to 10 significant digits where needed.
Frequently asked questions
- How many grays are in one rad?
- One rad is exactly 0.01 grays.
- How do I convert grays to rads?
- To convert grays to rads, multiply the number of grays by 100. The formula is rd = Gy × 100.
- Is this conversion exact?
- Yes. Both units have exact definitions and the factor 0.01 is exact. Displayed results are only rounded when they have many decimal places.
- Which is larger, a rad or a gray?
- A gray is 100 times larger than a rad. In other words, a rad is exactly 1/100 of a gray.