How to convert millisieverts to sieverts
Sv = mSv × 0.001Multiply the value in millisieverts by 0.001. To go the other way, multiply by 1,000 (or divide by 0.001).
A millisievert is smaller than a sievert: it takes 1,000 millisieverts to make one sievert.
Worked examples
- 1 millisievert1 mSv × 0.001 = 0.001 Sv
- 5 millisieverts5 mSv × 0.001 = 0.005 Sv
- 10 millisieverts10 mSv × 0.001 = 0.01 Sv
- 20 millisieverts20 mSv × 0.001 = 0.02 Sv
- 100 millisieverts100 mSv × 0.001 = 0.1 Sv
Millisieverts to sieverts conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Millisieverts (mSv) | Sieverts (Sv) |
|---|---|
| 0.1 mSv | 0.0001 Sv |
| 0.25 mSv | 0.00025 Sv |
| 0.5 mSv | 0.0005 Sv |
| 1 mSv | 0.001 Sv |
| 2 mSv | 0.002 Sv |
| 3 mSv | 0.003 Sv |
| 4 mSv | 0.004 Sv |
| 5 mSv | 0.005 Sv |
| 6 mSv | 0.006 Sv |
| 7 mSv | 0.007 Sv |
| 8 mSv | 0.008 Sv |
| 9 mSv | 0.009 Sv |
| 10 mSv | 0.01 Sv |
| Millisieverts (mSv) | Sieverts (Sv) |
|---|---|
| 12 mSv | 0.012 Sv |
| 15 mSv | 0.015 Sv |
| 20 mSv | 0.02 Sv |
| 25 mSv | 0.025 Sv |
| 30 mSv | 0.03 Sv |
| 40 mSv | 0.04 Sv |
| 50 mSv | 0.05 Sv |
| 75 mSv | 0.075 Sv |
| 100 mSv | 0.1 Sv |
| 250 mSv | 0.25 Sv |
| 500 mSv | 0.5 Sv |
| 1,000 mSv | 1 Sv |
About the units
Millisievert (mSv)
Annual occupational limits and medical-imaging doses are quoted in mSv. One millisievert equals 0.001 sieverts (Sv).
Sievert (Sv)
The sievert (Sv) is a unit of equivalent dose in the International System of Units (SI).
Frequently asked questions
How many sieverts are in one millisievert?
There are 0.001 sieverts in one millisievert, and this value is exact by definition.
How do I convert millisieverts to sieverts?
Multiply the number of millisieverts by 0.001. For example, 10 mSv × 0.001 = 0.01 Sv.
How many millisieverts are in one sievert?
One sievert equals 1,000 millisieverts. That is the reverse factor, 1 ÷ 0.001.
What is 10 millisieverts in sieverts?
10 mSv = 0.01 Sv.
Is this mSv to Sv 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.