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