Convert Milligrays to Millirads (mGy to mrad)
1 milligray (mGy) = 100 millirads (mrad). 1 mrad = 0.01 mGy. Example: 15 mGy = 15 × 100 = 1500 mrad.
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1 mGy = 100 mrad
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk milligray to millirad converter to paste a column from Excel.
How to Convert Milligray to Millirad
- 1 mGy = 100 mrad
- 1 mrad = 0.01 mGy
- Example: convert 15 mGy to mrad: 15 mGy = 15 × 100 mrad = 1500 mrad
Formula
mrad = mGy × 100
Derivation from SI units:
- 1 mGy = 10⁻³ Gy.
- 1 mrad = 10⁻⁵ Gy = 10 µGy.
- 1 mGy = 0.001 Gy ÷ 0.00001 Gy per mrad = 100 mrad
Both units are defined exactly, so the factor is exact. Milligray definition: milligray; Millirad definition: millirad.
Worked examples
- A reading of 0.5 mGy converts to 50 mrad.
0.5 mGy × 100 = 50 mrad - A value of 5 mGy is 500 mrad.
5 mGy × 100 = 500 mrad
Milligray to Millirad conversion table
| Milligrays (mGy) | Millirads (mrad) |
|---|---|
| 0.001 mGy | 0.1 mrad |
| 0.01 mGy | 1 mrad |
| 0.1 mGy | 10 mrad |
| 0.5 mGy | 50 mrad |
| 1 mGy | 100 mrad |
| 2 mGy | 200 mrad |
| 5 mGy | 500 mrad |
| 10 mGy | 1000 mrad |
| 50 mGy | 5000 mrad |
| 100 mGy | 10000 mrad |
Where it's used
Milligrays are used for CT dose index (CTDIvol), while millirads appear in older X-ray dose figures. Both measure absorbed dose of ionising radiation, so the conversion is a fixed factor.
Milligray to other absorbed dose units
| Conversion | 1 mGy equals |
|---|---|
| milligray to millirad | 100 mrad |
| milligray to gray | 0.001 Gy |
| milligray to rad | 0.1 rad |
| milligray to microgray | 1000 µGy |
| milligray to centigray | 0.1 cGy |
| milligray to kilogray | 0.000001 kGy |
Frequently asked questions
How many millirads are in 1 milligray?
1 mGy = 100 mrad.
How do I convert milligrays to millirads?
Multiply the value in mGy by 100. For example, 15 mGy × 100 = 1500 mrad.
Is the mGy to mrad conversion exact?
Yes. Both units are defined exactly, and 1 mGy is exactly 100 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 Milligrays to Millirads (mGy to mrad). Retrieved October 25, 2026, from https://scientificconverters.com/absorbed-dose/milligrays-to-millirads/
IEEE
Scientific Converters, "Convert Milligrays to Millirads (mGy to mrad)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/absorbed-dose/milligrays-to-millirads/