Millisievert (mSv)
A millisievert is one thousandth of a sievert. Natural background gives about 2.4 mSv a year worldwide; a chest CT about 7 mSv; the occupational limit is 20 mSv a year averaged over five years (ICRP).
Symbol: mSv
Quantity: equivalent and effective radiation dose
SI relation: 1 mSv = 0.001 Sv (exact)
Derivation: 1 mSv = 10⁻³ Sv.
Exact: yes, by definition
Typical uses
- Annual dose limits
- Medical imaging effective doses
- Background radiation
Convert millisieverts to other units
| Conversion | 1 mSv equals | Reverse |
|---|---|---|
| millisievert to sievert | 0.001 Sv | sievert to millisievert |
| millisievert to microsievert | 1000 µSv | microsievert to millisievert |
| millisievert to rem | 0.1 rem | rem to millisievert |
| millisievert to millirem | 100 mrem | millirem to millisievert |
| millisievert to nanosievert | 1000000 nSv | nanosievert to millisievert |
Open the Radiation Dose Converter (Sv, rem) to convert any value between all units.
Sources
- 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). Millisievert (mSv). Retrieved October 25, 2026, from https://scientificconverters.com/units/millisievert/
IEEE
Scientific Converters, "Millisievert (mSv)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/units/millisievert/