Convert Centigrays to Rads (cGy to rad)
1 centigray (cGy) = 1 rad. 1 rad = 1 cGy. Example: 15 cGy = 15 × 1 = 15 rad.
Also searched as centigrays to rad, centigrays in rad, centigrays into rads, cGy to rad, cGy in rads, cGy into rad, centigray to rad, cGy to rads converter and how many rads in a centigray.
1 cGy = 1 rad
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk centigray to rad converter to paste a column from Excel.
How to Convert Centigray to Rad
- 1 cGy = 1 rad
- 1 rad = 1 cGy
- Example: convert 15 cGy to rad: 15 cGy = 15 × 1 rad = 15 rad
Formula
rad = cGy × 1
Derivation from SI units:
- 1 cGy = 0.01 Gy = 1 rad.
- 1 rad = 100 erg/g = 0.01 Gy.
- 1 cGy = 0.01 Gy ÷ 0.01 Gy per rad = 1 rad
Both units are defined exactly, so the factor is exact. Centigray definition: centigray; Rad definition: rad.
Worked examples
- A reading of 100 cGy converts to 100 rad.
100 cGy × 1 = 100 rad - A value of 500 cGy is 500 rad.
500 cGy × 1 = 500 rad
Centigray to Rad conversion table
| Centigrays (cGy) | Rads (rad) |
|---|---|
| 1 cGy | 1 rad |
| 10 cGy | 10 rad |
| 50 cGy | 50 rad |
| 100 cGy | 100 rad |
| 180 cGy | 180 rad |
| 200 cGy | 200 rad |
| 500 cGy | 500 rad |
| 1000 cGy | 1000 rad |
| 5000 cGy | 5000 rad |
| 7000 cGy | 7000 rad |
Where it's used
Centigrays are used for radiotherapy plans (e.g. 200 cGy per fraction), while rads appear in US radiation safety and older literature. Both measure absorbed dose of ionising radiation, so the conversion is a fixed factor.
Centigray to other absorbed dose units
| Conversion | 1 cGy equals |
|---|---|
| centigray to rad | 1 rad |
| centigray to gray | 0.01 Gy |
| centigray to milligray | 10 mGy |
| centigray to microgray | 10000 µGy |
| centigray to kilogray | 0.00001 kGy |
| centigray to millirad | 1000 mrad |
Frequently asked questions
How many rads are in 1 centigray?
1 cGy = 1 rad.
How do I convert centigrays to rads?
Multiply the value in cGy by 1. For example, 15 cGy × 1 = 15 rad.
Is the cGy to rad conversion exact?
Yes. Both units are defined exactly, and 1 cGy is exactly 1 rad.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4 (becquerel, gray, sievert, lux) and Table 2 (candela).
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "rad (absorbed dose)".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Centigrays to Rads (cGy to rad). Retrieved October 25, 2026, from https://scientificconverters.com/absorbed-dose/centigrays-to-rads/
IEEE
Scientific Converters, "Convert Centigrays to Rads (cGy to rad)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/absorbed-dose/centigrays-to-rads/