How to convert sieverts to millisieverts
mSv = Sv × 1,000Multiply the value in sieverts by 1,000. To go the other way, multiply by 0.001 (or divide by 1,000).
A sievert is larger than a millisievert: one sievert contains 1,000 millisieverts.
Worked examples
- 1 sievert1 Sv × 1,000 = 1,000 mSv
- 5 sieverts5 Sv × 1,000 = 5,000 mSv
- 10 sieverts10 Sv × 1,000 = 10,000 mSv
- 20 sieverts20 Sv × 1,000 = 20,000 mSv
- 100 sieverts100 Sv × 1,000 = 100,000 mSv
Sieverts to millisieverts conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Sieverts (Sv) | Millisieverts (mSv) |
|---|---|
| 0.1 Sv | 100 mSv |
| 0.25 Sv | 250 mSv |
| 0.5 Sv | 500 mSv |
| 1 Sv | 1,000 mSv |
| 2 Sv | 2,000 mSv |
| 3 Sv | 3,000 mSv |
| 4 Sv | 4,000 mSv |
| 5 Sv | 5,000 mSv |
| 6 Sv | 6,000 mSv |
| 7 Sv | 7,000 mSv |
| 8 Sv | 8,000 mSv |
| 9 Sv | 9,000 mSv |
| 10 Sv | 10,000 mSv |
| Sieverts (Sv) | Millisieverts (mSv) |
|---|---|
| 12 Sv | 12,000 mSv |
| 15 Sv | 15,000 mSv |
| 20 Sv | 20,000 mSv |
| 25 Sv | 25,000 mSv |
| 30 Sv | 30,000 mSv |
| 40 Sv | 40,000 mSv |
| 50 Sv | 50,000 mSv |
| 75 Sv | 75,000 mSv |
| 100 Sv | 100,000 mSv |
| 250 Sv | 250,000 mSv |
| 500 Sv | 500,000 mSv |
| 1,000 Sv | 1,000,000 mSv |
About the units
Sievert (Sv)
The sievert (Sv) is a unit of equivalent dose in the International System of Units (SI).
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 sievert?
There are 1,000 millisieverts in one sievert, and this value is exact by definition.
How do I convert sieverts to millisieverts?
Multiply the number of sieverts by 1,000. For example, 10 Sv × 1,000 = 10,000 mSv.
How many sieverts are in one millisievert?
One millisievert equals 0.001 sieverts. That is the reverse factor, 1 ÷ 1,000.
What is 10 sieverts in millisieverts?
10 Sv = 10,000 mSv.
Is this Sv 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.