Rem
The rem (roentgen equivalent man) is the older unit of equivalent dose, exactly 0.01 sievert. US occupational limits are 5 rem per year.
Symbol: rem
Quantity: equivalent and effective radiation dose
SI relation: 1 rem = 0.01 Sv (exact)
Derivation: 1 rem = 0.01 Sv.
Exact: yes, by definition
Typical uses
- US NRC dose limits (5 rem/yr occupational)
- Older health-physics literature
Convert rem to other units
| Conversion | 1 rem equals | Reverse |
|---|---|---|
| rem to sievert | 0.01 Sv | sievert to rem |
| rem to millisievert | 10 mSv | millisievert to rem |
| rem to microsievert | 10000 µSv | microsievert to rem |
| rem to millirem | 1000 mrem | millirem to rem |
| rem to nanosievert | 10000000 nSv | nanosievert to rem |
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). Rem. Retrieved October 25, 2026, from https://scientificconverters.com/units/rem/
IEEE
Scientific Converters, "Rem," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/units/rem/