Convert Microsieverts to Millisieverts (µSv to mSv)
1 microsievert (µSv) = 0.001 millisieverts (mSv). 1 mSv = 1000 µSv. Example: 15 µSv = 15 × 0.001 = 0.015 mSv.
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1 µSv = 0.001 mSv
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk microsievert to millisievert converter to paste a column from Excel.
How to Convert Microsievert to Millisievert
- 1 µSv = 0.001 mSv
- 1 mSv = 1000 µSv
- Example: convert 15 µSv to mSv: 15 µSv = 15 × 0.001 mSv = 0.015 mSv
Formula
mSv = µSv ÷ 1000
Derivation from SI units:
- 1 µSv = 10⁻⁶ Sv.
- 1 mSv = 10⁻³ Sv.
- 1 µSv = 0.000001 Sv ÷ 0.001 Sv per mSv = 0.001 mSv
Both units are defined exactly, so the factor is exact. Microsievert definition: microsievert; Millisievert definition: millisievert.
Worked examples
- A reading of 5 µSv converts to 0.005 mSv.
5 µSv × 0.001 = 0.005 mSv - A value of 40 µSv is 0.04 mSv.
40 µSv × 0.001 = 0.04 mSv
Microsievert to Millisievert conversion table
| Microsieverts (µSv) | Millisieverts (mSv) |
|---|---|
| 0.1 µSv | 0.0001 mSv |
| 0.27 µSv | 0.00027 mSv |
| 1 µSv | 0.001 mSv |
| 5 µSv | 0.005 mSv |
| 10 µSv | 0.01 mSv |
| 20 µSv | 0.02 mSv |
| 40 µSv | 0.04 mSv |
| 100 µSv | 0.1 mSv |
| 1000 µSv | 1 mSv |
| 5000 µSv | 5 mSv |
Where it's used
Microsieverts are used for geiger counter and dosimeter readings (µSv/h), while millisieverts appear in annual dose limits. Both measure equivalent and effective radiation dose, so the conversion is a fixed factor.
Microsievert to other equivalent dose units
| Conversion | 1 µSv equals |
|---|---|
| microsievert to millisievert | 0.001 mSv |
| microsievert to sievert | 0.000001 Sv |
| microsievert to rem | 0.0001 rem |
| microsievert to millirem | 0.1 mrem |
| microsievert to nanosievert | 1000 nSv |
Frequently asked questions
How many millisieverts are in 1 microsievert?
1 µSv = 0.001 mSv.
How do I convert microsieverts to millisieverts?
Multiply the value in µSv by 0.001, or divide it by 1000. For example, 15 µSv × 0.001 = 0.015 mSv.
Is the µSv to mSv conversion exact?
Yes. Both units are defined exactly, and 1 µSv is exactly 0.001 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 Microsieverts to Millisieverts (µSv to mSv). Retrieved October 25, 2026, from https://scientificconverters.com/equivalent-dose/microsieverts-to-millisieverts/
IEEE
Scientific Converters, "Convert Microsieverts to Millisieverts (µSv to mSv)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/equivalent-dose/microsieverts-to-millisieverts/