Convert Millirads to Milligrays (mrad to mGy)
1 millirad (mrad) = 0.01 milligrays (mGy). 1 mGy = 100 mrad. Example: 15 mrad = 15 × 0.01 = 0.15 mGy.
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1 mrad = 0.01 mGy
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk millirad to milligray converter to paste a column from Excel.
How to Convert Millirad to Milligray
- 1 mrad = 0.01 mGy
- 1 mGy = 100 mrad
- Example: convert 15 mrad to mGy: 15 mrad = 15 × 0.01 mGy = 0.15 mGy
Formula
mGy = mrad ÷ 100
Derivation from SI units:
- 1 mrad = 10⁻⁵ Gy = 10 µGy.
- 1 mGy = 10⁻³ Gy.
- 1 mrad = 0.00001 Gy ÷ 0.001 Gy per mGy = 0.01 mGy
Both units are defined exactly, so the factor is exact. Millirad definition: millirad; Milligray definition: milligray.
Worked examples
- A reading of 0.5 mrad converts to 0.005 mGy.
0.5 mrad × 0.01 = 0.005 mGy - A value of 5 mrad is 0.05 mGy.
5 mrad × 0.01 = 0.05 mGy
Millirad to Milligray conversion table
| Millirads (mrad) | Milligrays (mGy) |
|---|---|
| 0.001 mrad | 0.00001 mGy |
| 0.01 mrad | 0.0001 mGy |
| 0.1 mrad | 0.001 mGy |
| 0.5 mrad | 0.005 mGy |
| 1 mrad | 0.01 mGy |
| 2 mrad | 0.02 mGy |
| 5 mrad | 0.05 mGy |
| 10 mrad | 0.1 mGy |
| 50 mrad | 0.5 mGy |
| 100 mrad | 1 mGy |
Where it's used
Millirads are used for older X-ray dose figures, while milligrays appear in CT dose index (CTDIvol). 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 milligray | 0.01 mGy |
| millirad to gray | 0.00001 Gy |
| millirad to rad | 0.001 rad |
| millirad to microgray | 10 µGy |
| millirad to centigray | 0.001 cGy |
| millirad to kilogray | 1 × 10⁻⁸ kGy |
Frequently asked questions
How many milligrays are in 1 millirad?
1 mrad = 0.01 mGy.
How do I convert millirads to milligrays?
Multiply the value in mrad by 0.01, or divide it by 100. For example, 15 mrad × 0.01 = 0.15 mGy.
Is the mrad to mGy conversion exact?
Yes. Both units are defined exactly, and 1 mrad is exactly 0.01 mGy.
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 Milligrays (mrad to mGy). Retrieved October 25, 2026, from https://scientificconverters.com/absorbed-dose/millirads-to-milligrays/
IEEE
Scientific Converters, "Convert Millirads to Milligrays (mrad to mGy)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/absorbed-dose/millirads-to-milligrays/