Convert Sieverts to Millisieverts (Sv to mSv)
1 sievert (Sv) = 1000 millisieverts (mSv). 1 mSv = 0.001 Sv. Example: 15 Sv = 15 × 1000 = 15000 mSv.
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1 Sv = 1000 mSv
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk sievert to millisievert converter to paste a column from Excel.
How to Convert Sievert to Millisievert
- 1 Sv = 1000 mSv
- 1 mSv = 0.001 Sv
- Example: convert 15 Sv to mSv: 15 Sv = 15 × 1000 mSv = 15000 mSv
Formula
mSv = Sv × 1000
Derivation from SI units:
- 1 Sv = 1 J/kg weighted for radiation type (and tissue for effective dose).
- 1 mSv = 10⁻³ Sv.
Both units are defined exactly, so the factor is exact. Sievert definition: sievert; Millisievert definition: millisievert.
Worked examples
- A reading of 0.05 Sv converts to 50 mSv.
0.05 Sv × 1000 = 50 mSv - A value of 0.5 Sv is 500 mSv.
0.5 Sv × 1000 = 500 mSv
Sievert to Millisievert conversion table
| Sieverts (Sv) | Millisieverts (mSv) |
|---|---|
| 0.001 Sv | 1 mSv |
| 0.01 Sv | 10 mSv |
| 0.02 Sv | 20 mSv |
| 0.05 Sv | 50 mSv |
| 0.1 Sv | 100 mSv |
| 0.25 Sv | 250 mSv |
| 0.5 Sv | 500 mSv |
| 1 Sv | 1000 mSv |
| 4 Sv | 4000 mSv |
| 10 Sv | 10000 mSv |
Where it's used
Sieverts are used for radiation protection limits, while millisieverts appear in annual dose limits. Both measure equivalent and effective radiation dose, so the conversion is a fixed factor.
Sievert to other equivalent dose units
| Conversion | 1 Sv equals |
|---|---|
| sievert to millisievert | 1000 mSv |
| sievert to microsievert | 1000000 µSv |
| sievert to rem | 100 rem |
| sievert to millirem | 100000 mrem |
| sievert to nanosievert | 1000000000 nSv |
Frequently asked questions
How many millisieverts are in 1 sievert?
1 Sv = 1000 mSv.
How do I convert sieverts to millisieverts?
Multiply the value in Sv by 1000. For example, 15 Sv × 1000 = 15000 mSv.
Is the Sv to mSv conversion exact?
Yes. Both units are defined exactly, and 1 Sv is exactly 1000 mSv.
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 Sieverts to Millisieverts (Sv to mSv). Retrieved October 25, 2026, from https://scientificconverters.com/equivalent-dose/sieverts-to-millisieverts/
IEEE
Scientific Converters, "Convert Sieverts to Millisieverts (Sv to mSv)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/equivalent-dose/sieverts-to-millisieverts/