Millirem (mrem)
A millirem is one thousandth of a rem, 10 microsieverts. The average US dose is about 620 mrem a year (NCRP 160); the public limit is 100 mrem.
Symbol: mrem
Quantity: equivalent and effective radiation dose
SI relation: 1 mrem = 0.00001 Sv (exact)
Derivation: 1 mrem = 10⁻⁵ Sv = 10 µSv.
Exact: yes, by definition
Typical uses
- US public dose limit (100 mrem/yr)
- Badge dosimeter reports in the US
Convert millirem to other units
| Conversion | 1 mrem equals | Reverse |
|---|---|---|
| millirem to sievert | 0.00001 Sv | sievert to millirem |
| millirem to millisievert | 0.01 mSv | millisievert to millirem |
| millirem to microsievert | 10 µSv | microsievert to millirem |
| millirem to rem | 0.001 rem | rem to millirem |
| millirem to nanosievert | 10000 nSv | nanosievert to millirem |
Open the Radiation Dose Converter (Sv, rem) to convert any value between all units.
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, "rem".
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). Millirem (mrem). Retrieved October 25, 2026, from https://scientificconverters.com/units/millirem/
IEEE
Scientific Converters, "Millirem (mrem)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/units/millirem/