Gray to Rad (absorbed dose) Converter
1 gray is exactly 100 rads. Convert grays (Gy) to rads (rd) below: type a value and the result updates as you type.
Gy to rd calculator
Result
Gray to Rad (absorbed dose) conversion
1 Gy = 100 rdone gray in rads
1 rd = 0.01 Gyone rad in grays
Gray (Gy): SI unit of absorbed dose: one joule of radiation energy absorbed per kilogram of matter.
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).
Source:Gray: SI Brochure, 9th edition (BIPM, 2019); Rad (absorbed dose): NIST Special Publication 811 (2008), Appendix B.8
How to convert grays to rads
To convert grays to rads, multiply the number of grays by 100.
Formula
rd = Gy × 100
Examples
- 5 Gy = 5 × 100 = 500 rd
- 25 Gy = 25 × 100 = 2500 rd
- 100 Gy = 100 × 100 = 10000 rd
Gray to Rad (absorbed dose) conversion table
| Gray (Gy) | Rad (absorbed dose) (rd) |
|---|---|
| 0.1 Gy | 10 rd |
| 0.5 Gy | 50 rd |
| 1 Gy | 100 rd |
| 2 Gy | 200 rd |
| 3 Gy | 300 rd |
| 5 Gy | 500 rd |
| 10 Gy | 1000 rd |
| 20 Gy | 2000 rd |
| 25 Gy | 2500 rd |
| 50 Gy | 5000 rd |
| 100 Gy | 10000 rd |
| 250 Gy | 25000 rd |
| 500 Gy | 50000 rd |
| 1000 Gy | 100000 rd |
Values rounded to 10 significant digits where needed.
Frequently asked questions
- How many rads are in one gray?
- One gray is exactly 100 rads.
- How do I convert rads to grays?
- To convert rads to grays, multiply the number of rads by 0.01. The formula is Gy = rd × 0.01.
- Is this conversion exact?
- Yes. Both units have exact definitions and the factor 100 is exact. Displayed results are only rounded when they have many decimal places.
- Which is larger, a gray or a rad?
- A gray is 100 times larger than a rad. In other words, a rad is exactly 1/100 of a gray.