Convert Millirads to Centigrays (mrad to cGy)
1 millirad (mrad) = 0.001 centigrays (cGy). 1 cGy = 1000 mrad. Example: 15 mrad = 15 × 0.001 = 0.015 cGy.
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1 mrad = 0.001 cGy
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk millirad to centigray converter to paste a column from Excel.
How to Convert Millirad to Centigray
- 1 mrad = 0.001 cGy
- 1 cGy = 1000 mrad
- Example: convert 15 mrad to cGy: 15 mrad = 15 × 0.001 cGy = 0.015 cGy
Formula
cGy = mrad ÷ 1000
Derivation from SI units:
- 1 mrad = 10⁻⁵ Gy = 10 µGy.
- 1 cGy = 0.01 Gy = 1 rad.
- 1 mrad = 0.00001 Gy ÷ 0.01 Gy per cGy = 0.001 cGy
Both units are defined exactly, so the factor is exact. Millirad definition: millirad; Centigray definition: centigray.
Worked examples
- A reading of 0.5 mrad converts to 0.0005 cGy.
0.5 mrad × 0.001 = 0.0005 cGy - A value of 5 mrad is 0.005 cGy.
5 mrad × 0.001 = 0.005 cGy
Millirad to Centigray conversion table
| Millirads (mrad) | Centigrays (cGy) |
|---|---|
| 0.001 mrad | 0.000001 cGy |
| 0.01 mrad | 0.00001 cGy |
| 0.1 mrad | 0.0001 cGy |
| 0.5 mrad | 0.0005 cGy |
| 1 mrad | 0.001 cGy |
| 2 mrad | 0.002 cGy |
| 5 mrad | 0.005 cGy |
| 10 mrad | 0.01 cGy |
| 50 mrad | 0.05 cGy |
| 100 mrad | 0.1 cGy |
Where it's used
Millirads are used for older X-ray dose figures, while centigrays appear in radiotherapy plans (e.g. 200 cGy per fraction). Both measure absorbed dose of ionising radiation, so the conversion is a fixed factor.
Millirad to other absorbed dose units
| Conversion | 1 mrad equals |
|---|---|
| millirad to centigray | 0.001 cGy |
| millirad to gray | 0.00001 Gy |
| millirad to milligray | 0.01 mGy |
| millirad to rad | 0.001 rad |
| millirad to microgray | 10 µGy |
| millirad to kilogray | 1 × 10⁻⁸ kGy |
Frequently asked questions
How many centigrays are in 1 millirad?
1 mrad = 0.001 cGy.
How do I convert millirads to centigrays?
Multiply the value in mrad by 0.001, or divide it by 1000. For example, 15 mrad × 0.001 = 0.015 cGy.
Is the mrad to cGy conversion exact?
Yes. Both units are defined exactly, and 1 mrad is exactly 0.001 cGy.
Sources
- 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)".
- 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).
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 Millirads to Centigrays (mrad to cGy). Retrieved October 25, 2026, from https://scientificconverters.com/absorbed-dose/millirads-to-centigrays/
IEEE
Scientific Converters, "Convert Millirads to Centigrays (mrad to cGy)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/absorbed-dose/millirads-to-centigrays/