Convert Millirem to Nanosieverts (mrem to nSv)
1 millirem (mrem) = 10000 nanosieverts (nSv). 1 nSv = 0.0001 mrem. Example: 15 mrem = 15 × 10000 = 150000 nSv.
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1 mrem = 10000 nSv
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk millirem to nanosievert converter to paste a column from Excel.
How to Convert Millirem to Nanosievert
- 1 mrem = 10000 nSv
- 1 nSv = 0.0001 mrem
- Example: convert 15 mrem to nSv: 15 mrem = 15 × 10000 nSv = 150000 nSv
Formula
nSv = mrem × 10000
Derivation from SI units:
- 1 mrem = 10⁻⁵ Sv = 10 µSv.
- 1 nSv = 10⁻⁹ Sv.
- 1 mrem = 0.00001 Sv ÷ 1 × 10⁻⁹ Sv per nSv = 10000 nSv
Both units are defined exactly, so the factor is exact. Millirem definition: millirem; Nanosievert definition: nanosievert.
Worked examples
- A reading of 20 mrem converts to 200000 nSv.
20 mrem × 10000 = 200000 nSv - A value of 620 mrem is 6200000 nSv.
620 mrem × 10000 = 6200000 nSv
Millirem to Nanosievert conversion table
| Millirem (mrem) | Nanosieverts (nSv) |
|---|---|
| 1 mrem | 10000 nSv |
| 2 mrem | 20000 nSv |
| 10 mrem | 100000 nSv |
| 20 mrem | 200000 nSv |
| 100 mrem | 1000000 nSv |
| 310 mrem | 3100000 nSv |
| 620 mrem | 6200000 nSv |
| 1000 mrem | 10000000 nSv |
| 5000 mrem | 50000000 nSv |
| 10000 mrem | 100000000 nSv |
Where it's used
Millirem are used for US public dose limit (100 mrem/yr), while nanosieverts appear in environmental radiation monitoring networks. 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 nanosievert | 10000 nSv |
| millirem to sievert | 0.00001 Sv |
| millirem to millisievert | 0.01 mSv |
| millirem to microsievert | 10 µSv |
| millirem to rem | 0.001 rem |
Frequently asked questions
How many nanosieverts are in 1 millirem?
1 mrem = 10000 nSv.
How do I convert millirem to nanosieverts?
Multiply the value in mrem by 10000. For example, 15 mrem × 10000 = 150000 nSv.
Is the mrem to nSv conversion exact?
Yes. Both units are defined exactly, and 1 mrem is exactly 10000 nSv.
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 Millirem to Nanosieverts (mrem to nSv). Retrieved October 25, 2026, from https://scientificconverters.com/equivalent-dose/millirem-to-nanosieverts/
IEEE
Scientific Converters, "Convert Millirem to Nanosieverts (mrem to nSv)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/equivalent-dose/millirem-to-nanosieverts/