Microsievert is 0.000001 sievert units.
Microsieverts to Millisieverts Converter — uSv to mSv
Convert Microsievert (uSv) to Millisievert (mSv) using the exact conversion factor (1 microsievert = 0.001 millisievert). See the formula, worked examples, and conversion table.
Microsieverts to Millisieverts converter
Converter
Radiation Converter
Convert radioactivity, absorbed dose, and equivalent dose units by compatible radiation family.
Context values
Some unit families need one extra value for a physically accurate result.
Millisievert is 0.001 sievert units.
Result = input x 1e-6 / 0.001.
Equivalent Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Microsieverts to Millisieverts
Microsievert and Millisievert both belong to the radiation-measurement family, though radiation quantities fall into genuinely distinct categories: absorbed dose (gray, rad) measures energy deposited in matter, equivalent dose (sievert, rem) weights that for biological harm, and activity (becquerel, curie) measures how often a radioactive source decays — this page only converts between units of the same kind. Specifically: Microsievert is 0.000001 sievert units, and millisievert is 0.001 sievert units.
Formula
millisieverts = microsieverts × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 microsievert equals 0.000001 base units, and 1 millisievert equals 0.001 base units, so dividing one by the other gives the direct microsievert-to-millisievert factor of 0.001.
Simple example
1 uSv × 0.001 = 0.001 mSv
1 microsievert = 0.001 millisieverts.
Real-world example
10 uSv × 0.001 = 0.01 mSv
10 microsieverts = 0.01 millisieverts.
Conversion table
| Microsievert (uSv) | Millisievert (mSv) |
|---|---|
| 0.001 uSv | 0.000001 mSv |
| 0.01 uSv | 0.00001 mSv |
| 0.1 uSv | 0.0001 mSv |
| 1 uSv | 0.001 mSv |
| 10 uSv | 0.01 mSv |
| 100 uSv | 0.1 mSv |
Reverse conversion: Millisievert to Microsievert
0.001 mSv × 1000 = 1 uSv
0.001 millisieverts = 1 microsievert.
microsieverts = millisieverts × 1000
For a page dedicated to this direction, see Millisievert to Microsievert.
Understanding the Microsievert (uSv)
Microsievert is 0.000001 sievert units.
Understanding the Millisievert (mSv)
Millisievert is 0.001 sievert units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many millisieverts are in 1 microsievert?
1 microsievert equals 0.001 millisieverts, using the exact defined conversion factor rather than an estimate.
How do I convert microsievert to millisievert?
Multiply the microsievert value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert millisievert back to microsievert?
Use the reverse factor: 1 millisievert equals 1,000 microsieverts. You can also use the swap control in the converter above to flip the direction instantly.
What is a microsievert?
Microsievert (uSv) is a unit of radiation.
What is a millisievert?
Millisievert (mSv) is a unit of radiation.
Is the microsievert to millisievert conversion exact?
Yes. Both microsievert and millisievert are defined by fixed standards rather than physical artifacts, so the factor of 0.001 used above is exact to as many digits as you choose to display.
What's the difference between absorbed dose, equivalent dose, and activity?
Absorbed dose (gray, rad) measures the energy radiation deposits in matter. Equivalent dose (sievert, rem) adjusts that figure for how harmful different types of radiation are to biological tissue. Activity (becquerel, curie) measures how often a radioactive source decays, independent of how much dose a person actually receives from it.