Convert Rads to Millirads (rad to mrad)
1 rad = 1000 millirads (mrad). 1 mrad = 0.001 rad. Example: 15 rad = 15 × 1000 = 15000 mrad.
Also searched as rads to mrad, rads in mrad, rads into millirads, rad to mrad, rad in millirads, rad into millirad, rad to millirad, rad to millirads converter and how many millirads in a rad.
1 rad = 1000 mrad
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk rad to millirad converter to paste a column from Excel.
How to Convert Rad to Millirad
- 1 rad = 1000 mrad
- 1 mrad = 0.001 rad
- Example: convert 15 rad to mrad: 15 rad = 15 × 1000 mrad = 15000 mrad
Formula
mrad = rad × 1000
Derivation from SI units:
- 1 rad = 100 erg/g = 0.01 Gy.
- 1 mrad = 10⁻⁵ Gy = 10 µGy.
- 1 rad = 0.01 Gy ÷ 0.00001 Gy per mrad = 1000 mrad
Both units are defined exactly, so the factor is exact. Rad definition: rad; Millirad definition: millirad.
Worked examples
- A reading of 0.5 rad converts to 500 mrad.
0.5 rad × 1000 = 500 mrad - A value of 5 rad is 5000 mrad.
5 rad × 1000 = 5000 mrad
Rad to Millirad conversion table
| Rads (rad) | Millirads (mrad) |
|---|---|
| 0.001 rad | 1 mrad |
| 0.01 rad | 10 mrad |
| 0.1 rad | 100 mrad |
| 0.5 rad | 500 mrad |
| 1 rad | 1000 mrad |
| 2 rad | 2000 mrad |
| 5 rad | 5000 mrad |
| 10 rad | 10000 mrad |
| 50 rad | 50000 mrad |
| 100 rad | 100000 mrad |
Where it's used
Rads are used for US radiation safety and older literature, while millirads appear in older X-ray dose figures. Both measure absorbed dose of ionising radiation, so the conversion is a fixed factor.
Rad to other absorbed dose units
| Conversion | 1 rad equals |
|---|---|
| rad to millirad | 1000 mrad |
| rad to gray | 0.01 Gy |
| rad to milligray | 10 mGy |
| rad to microgray | 10000 µGy |
| rad to centigray | 1 cGy |
| rad to kilogray | 0.00001 kGy |
Frequently asked questions
How many millirads are in 1 rad?
1 rad = 1000 mrad.
How do I convert rads to millirads?
Multiply the value in rad by 1000. For example, 15 rad × 1000 = 15000 mrad.
Is the rad to mrad conversion exact?
Yes. Both units are defined exactly, and 1 rad is exactly 1000 mrad.
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 Rads to Millirads (rad to mrad). Retrieved October 25, 2026, from https://scientificconverters.com/absorbed-dose/rads-to-millirads/
IEEE
Scientific Converters, "Convert Rads to Millirads (rad to mrad)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/absorbed-dose/rads-to-millirads/