How to convert microsieverts to millisieverts
mSv = µSv × 0.001Multiply the value in microsieverts by 0.001. To go the other way, multiply by 1,000 (or divide by 0.001).
A microsievert is smaller than a millisievert: it takes 1,000 microsieverts to make one millisievert.
Worked examples
- 1 microsievert1 µSv × 0.001 = 0.001 mSv
- 5 microsieverts5 µSv × 0.001 = 0.005 mSv
- 10 microsieverts10 µSv × 0.001 = 0.01 mSv
- 20 microsieverts20 µSv × 0.001 = 0.02 mSv
- 100 microsieverts100 µSv × 0.001 = 0.1 mSv
Microsieverts to millisieverts conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Microsieverts (µSv) | Millisieverts (mSv) |
|---|---|
| 0.1 µSv | 0.0001 mSv |
| 0.25 µSv | 0.00025 mSv |
| 0.5 µSv | 0.0005 mSv |
| 1 µSv | 0.001 mSv |
| 2 µSv | 0.002 mSv |
| 3 µSv | 0.003 mSv |
| 4 µSv | 0.004 mSv |
| 5 µSv | 0.005 mSv |
| 6 µSv | 0.006 mSv |
| 7 µSv | 0.007 mSv |
| 8 µSv | 0.008 mSv |
| 9 µSv | 0.009 mSv |
| 10 µSv | 0.01 mSv |
| Microsieverts (µSv) | Millisieverts (mSv) |
|---|---|
| 12 µSv | 0.012 mSv |
| 15 µSv | 0.015 mSv |
| 20 µSv | 0.02 mSv |
| 25 µSv | 0.025 mSv |
| 30 µSv | 0.03 mSv |
| 40 µSv | 0.04 mSv |
| 50 µSv | 0.05 mSv |
| 75 µSv | 0.075 mSv |
| 100 µSv | 0.1 mSv |
| 250 µSv | 0.25 mSv |
| 500 µSv | 0.5 mSv |
| 1,000 µSv | 1 mSv |
About the units
Microsievert (µSv)
A dental X-ray is around 5 µSv. One microsievert equals 0.000001 sieverts (Sv).
Millisievert (mSv)
Annual occupational limits and medical-imaging doses are quoted in mSv. One millisievert equals 0.001 sieverts (Sv).
Frequently asked questions
How many millisieverts are in one microsievert?
There are 0.001 millisieverts in one microsievert, and this value is exact by definition.
How do I convert microsieverts to millisieverts?
Multiply the number of microsieverts by 0.001. For example, 10 µSv × 0.001 = 0.01 mSv.
How many microsieverts are in one millisievert?
One millisievert equals 1,000 microsieverts. That is the reverse factor, 1 ÷ 0.001.
What is 10 microsieverts in millisieverts?
10 µSv = 0.01 mSv.
Is this µSv to mSv converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.