Convert Millirem to Rem (mrem to rem)
1 millirem (mrem) = 0.001 rem. 1 rem = 1000 mrem. Example: 15 mrem = 15 × 0.001 = 0.015 rem.
Also searched as millirem to rem, millirem in rem, millirem into rem, mrem to rem, mrem in rem, mrem into rem, mrem to rem converter and how many rem in a millirem.
1 mrem = 0.001 rem
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk millirem to rem converter to paste a column from Excel.
How to Convert Millirem to Rem
- 1 mrem = 0.001 rem
- 1 rem = 1000 mrem
- Example: convert 15 mrem to rem: 15 mrem = 15 × 0.001 rem = 0.015 rem
Formula
rem = mrem ÷ 1000
Derivation from SI units:
- 1 mrem = 10⁻⁵ Sv = 10 µSv.
- 1 rem = 0.01 Sv.
- 1 mrem = 0.00001 Sv ÷ 0.01 Sv per rem = 0.001 rem
Both units are defined exactly, so the factor is exact. Millirem definition: millirem; Rem definition: rem.
Worked examples
- A reading of 20 mrem converts to 0.02 rem.
20 mrem × 0.001 = 0.02 rem - A value of 620 mrem is 0.62 rem.
620 mrem × 0.001 = 0.62 rem
Millirem to Rem conversion table
| Millirem (mrem) | Rem |
|---|---|
| 1 mrem | 0.001 rem |
| 2 mrem | 0.002 rem |
| 10 mrem | 0.01 rem |
| 20 mrem | 0.02 rem |
| 100 mrem | 0.1 rem |
| 310 mrem | 0.31 rem |
| 620 mrem | 0.62 rem |
| 1000 mrem | 1 rem |
| 5000 mrem | 5 rem |
| 10000 mrem | 10 rem |
Where it's used
Millirem are used for US public dose limit (100 mrem/yr), while rem appear in US NRC dose limits (5 rem/yr occupational). Both measure equivalent and effective radiation dose, so the conversion is a fixed factor.
Millirem to other equivalent dose units
| Conversion | 1 mrem equals |
|---|---|
| millirem to rem | 0.001 rem |
| millirem to sievert | 0.00001 Sv |
| millirem to millisievert | 0.01 mSv |
| millirem to microsievert | 10 µSv |
| millirem to nanosievert | 10000 nSv |
Frequently asked questions
How many rem are in 1 millirem?
1 mrem = 0.001 rem.
How do I convert millirem to rem?
Multiply the value in mrem by 0.001, or divide it by 1000. For example, 15 mrem × 0.001 = 0.015 rem.
Is the mrem to rem conversion exact?
Yes. Both units are defined exactly, and 1 mrem is exactly 0.001 rem.
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). Convert Millirem to Rem (mrem to rem). Retrieved October 25, 2026, from https://scientificconverters.com/equivalent-dose/millirem-to-rem/
IEEE
Scientific Converters, "Convert Millirem to Rem (mrem to rem)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/equivalent-dose/millirem-to-rem/