Convert Centigrays to Millirads (cGy to mrad)
1 centigray (cGy) = 1000 millirads (mrad). 1 mrad = 0.001 cGy. Example: 15 cGy = 15 × 1000 = 15000 mrad.
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1 cGy = 1000 mrad
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk centigray to millirad converter to paste a column from Excel.
How to Convert Centigray to Millirad
- 1 cGy = 1000 mrad
- 1 mrad = 0.001 cGy
- Example: convert 15 cGy to mrad: 15 cGy = 15 × 1000 mrad = 15000 mrad
Formula
mrad = cGy × 1000
Derivation from SI units:
- 1 cGy = 0.01 Gy = 1 rad.
- 1 mrad = 10⁻⁵ Gy = 10 µGy.
- 1 cGy = 0.01 Gy ÷ 0.00001 Gy per mrad = 1000 mrad
Both units are defined exactly, so the factor is exact. Centigray definition: centigray; Millirad definition: millirad.
Worked examples
- A reading of 100 cGy converts to 100000 mrad.
100 cGy × 1000 = 100000 mrad - A value of 500 cGy is 500000 mrad.
500 cGy × 1000 = 500000 mrad
Centigray to Millirad conversion table
| Centigrays (cGy) | Millirads (mrad) |
|---|---|
| 1 cGy | 1000 mrad |
| 10 cGy | 10000 mrad |
| 50 cGy | 50000 mrad |
| 100 cGy | 100000 mrad |
| 180 cGy | 180000 mrad |
| 200 cGy | 200000 mrad |
| 500 cGy | 500000 mrad |
| 1000 cGy | 1000000 mrad |
| 5000 cGy | 5000000 mrad |
| 7000 cGy | 7000000 mrad |
Where it's used
Centigrays are used for radiotherapy plans (e.g. 200 cGy per fraction), while millirads appear in older X-ray dose figures. 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 millirad | 1000 mrad |
| centigray to gray | 0.01 Gy |
| centigray to milligray | 10 mGy |
| centigray to rad | 1 rad |
| centigray to microgray | 10000 µGy |
| centigray to kilogray | 0.00001 kGy |
Frequently asked questions
How many millirads are in 1 centigray?
1 cGy = 1000 mrad.
How do I convert centigrays to millirads?
Multiply the value in cGy by 1000. For example, 15 cGy × 1000 = 15000 mrad.
Is the cGy to mrad conversion exact?
Yes. Both units are defined exactly, and 1 cGy is exactly 1000 mrad.
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 Millirads (cGy to mrad). Retrieved October 25, 2026, from https://scientificconverters.com/absorbed-dose/centigrays-to-millirads/
IEEE
Scientific Converters, "Convert Centigrays to Millirads (cGy to mrad)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/absorbed-dose/centigrays-to-millirads/