Convert Rem to Millisieverts (rem to mSv)
1 rem = 10 millisieverts (mSv). 1 mSv = 0.1 rem. Example: 15 rem = 15 × 10 = 150 mSv.
Also searched as rem to mSv, rem in mSv, rem into millisieverts, rem in millisieverts, rem into millisievert, rem to millisievert, rem to millisieverts converter and how many millisieverts in a rem.
1 rem = 10 mSv
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk rem to millisievert converter to paste a column from Excel.
How to Convert Rem to Millisievert
- 1 rem = 10 mSv
- 1 mSv = 0.1 rem
- Example: convert 15 rem to mSv: 15 rem = 15 × 10 mSv = 150 mSv
Formula
mSv = rem × 10
Derivation from SI units:
- 1 rem = 0.01 Sv.
- 1 mSv = 10⁻³ Sv.
- 1 rem = 0.01 Sv ÷ 0.001 Sv per mSv = 10 mSv
Both units are defined exactly, so the factor is exact. Rem definition: rem; Millisievert definition: millisievert.
Worked examples
- A reading of 5 rem converts to 50 mSv.
5 rem × 10 = 50 mSv - A value of 50 rem is 500 mSv.
50 rem × 10 = 500 mSv
Rem to Millisievert conversion table
| Rem | Millisieverts (mSv) |
|---|---|
| 0.1 rem | 1 mSv |
| 0.5 rem | 5 mSv |
| 1 rem | 10 mSv |
| 5 rem | 50 mSv |
| 10 rem | 100 mSv |
| 25 rem | 250 mSv |
| 50 rem | 500 mSv |
| 100 rem | 1000 mSv |
| 400 rem | 4000 mSv |
| 1000 rem | 10000 mSv |
Where it's used
Rem are used for US NRC dose limits (5 rem/yr occupational), while millisieverts appear in annual dose limits. Both measure equivalent and effective radiation dose, so the conversion is a fixed factor.
Rem to other equivalent dose units
| Conversion | 1 rem equals |
|---|---|
| rem to millisievert | 10 mSv |
| rem to sievert | 0.01 Sv |
| rem to microsievert | 10000 µSv |
| rem to millirem | 1000 mrem |
| rem to nanosievert | 10000000 nSv |
Frequently asked questions
How many millisieverts are in 1 rem?
1 rem = 10 mSv.
How do I convert rem to millisieverts?
Multiply the value in rem by 10. For example, 15 rem × 10 = 150 mSv.
Is the rem to mSv conversion exact?
Yes. Both units are defined exactly, and 1 rem is exactly 10 mSv.
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".
- 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).
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 Rem to Millisieverts (rem to mSv). Retrieved October 25, 2026, from https://scientificconverters.com/equivalent-dose/rem-to-millisieverts/
IEEE
Scientific Converters, "Convert Rem to Millisieverts (rem to mSv)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/equivalent-dose/rem-to-millisieverts/