Convert Millisieverts to Sieverts (mSv to Sv)
1 millisievert (mSv) = 0.001 sieverts (Sv). 1 Sv = 1000 mSv. Example: 15 mSv = 15 × 0.001 = 0.015 Sv.
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1 mSv = 0.001 Sv
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk millisievert to sievert converter to paste a column from Excel.
How to Convert Millisievert to Sievert
- 1 mSv = 0.001 Sv
- 1 Sv = 1000 mSv
- Example: convert 15 mSv to Sv: 15 mSv = 15 × 0.001 Sv = 0.015 Sv
Formula
Sv = mSv ÷ 1000
Derivation from SI units:
- 1 mSv = 10⁻³ Sv.
- 1 Sv = 1 J/kg weighted for radiation type (and tissue for effective dose).
Both units are defined exactly, so the factor is exact. Millisievert definition: millisievert; Sievert definition: sievert.
Worked examples
- A reading of 2.4 mSv converts to 0.0024 Sv.
2.4 mSv × 0.001 = 0.0024 Sv - A value of 10 mSv is 0.01 Sv.
10 mSv × 0.001 = 0.01 Sv
Millisievert to Sievert conversion table
| Millisieverts (mSv) | Sieverts (Sv) |
|---|---|
| 0.01 mSv | 0.00001 Sv |
| 0.1 mSv | 0.0001 Sv |
| 1 mSv | 0.001 Sv |
| 2.4 mSv | 0.0024 Sv |
| 3 mSv | 0.003 Sv |
| 7 mSv | 0.007 Sv |
| 10 mSv | 0.01 Sv |
| 20 mSv | 0.02 Sv |
| 50 mSv | 0.05 Sv |
| 100 mSv | 0.1 Sv |
Where it's used
Millisieverts are used for annual dose limits, while sieverts appear in radiation protection limits. Both measure equivalent and effective radiation dose, so the conversion is a fixed factor.
Millisievert to other equivalent dose units
| Conversion | 1 mSv equals |
|---|---|
| millisievert to sievert | 0.001 Sv |
| millisievert to microsievert | 1000 µSv |
| millisievert to rem | 0.1 rem |
| millisievert to millirem | 100 mrem |
| millisievert to nanosievert | 1000000 nSv |
Frequently asked questions
How many sieverts are in 1 millisievert?
1 mSv = 0.001 Sv.
How do I convert millisieverts to sieverts?
Multiply the value in mSv by 0.001, or divide it by 1000. For example, 15 mSv × 0.001 = 0.015 Sv.
Is the mSv to Sv conversion exact?
Yes. Both units are defined exactly, and 1 mSv is exactly 0.001 Sv.
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). Convert Millisieverts to Sieverts (mSv to Sv). Retrieved October 25, 2026, from https://scientificconverters.com/equivalent-dose/millisieverts-to-sieverts/
IEEE
Scientific Converters, "Convert Millisieverts to Sieverts (mSv to Sv)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/equivalent-dose/millisieverts-to-sieverts/