Millisievert is 0.001 sievert units.
Millisieverts to Microsieverts Converter — mSv to uSv
Convert Millisievert (mSv) to Microsievert (uSv) using the exact conversion factor (1 millisievert = 1,000 microsievert). See the formula, worked examples, and conversion table.
Millisieverts to Microsieverts 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.
Microsievert is 0.000001 sievert units.
Result = input x 0.001 / 1e-6.
Equivalent Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Millisieverts to Microsieverts
Millisievert and Microsievert 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: Millisievert is 0.001 sievert units, and microsievert is 0.000001 sievert units.
Formula
microsieverts = millisieverts × 1000
This factor comes from each unit's defined relationship to the category's base unit: 1 millisievert equals 0.001 base units, and 1 microsievert equals 0.000001 base units, so dividing one by the other gives the direct millisievert-to-microsievert factor of 1000.
Simple example
1 mSv × 1000 = 1,000 uSv
1 millisievert = 1,000 microsieverts.
Real-world example
10 mSv × 1000 = 10,000 uSv
10 millisieverts = 10,000 microsieverts.
Conversion table
| Millisievert (mSv) | Microsievert (uSv) |
|---|---|
| 0.001 mSv | 1 uSv |
| 0.01 mSv | 10 uSv |
| 0.1 mSv | 100 uSv |
| 1 mSv | 1,000 uSv |
| 10 mSv | 10,000 uSv |
| 100 mSv | 100,000 uSv |
Reverse conversion: Microsievert to Millisievert
1 uSv × 0.001 = 0.001 mSv
1 microsievert = 0.001 millisieverts.
millisieverts = microsieverts × 0.001
For a page dedicated to this direction, see Microsievert to Millisievert.
Understanding the Millisievert (mSv)
Millisievert is 0.001 sievert units.
Understanding the Microsievert (uSv)
Microsievert is 0.000001 sievert units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many microsieverts are in 1 millisievert?
1 millisievert equals 1,000 microsieverts, using the exact defined conversion factor rather than an estimate.
How do I convert millisievert to microsievert?
Multiply the millisievert value by 1000. The converter above does this instantly to whatever precision you set.
How do I convert microsievert back to millisievert?
Use the reverse factor: 1 microsievert equals 0.001 millisieverts. You can also use the swap control in the converter above to flip the direction instantly.
What is a millisievert?
Millisievert (mSv) is a unit of radiation.
What is a microsievert?
Microsievert (uSv) is a unit of radiation.
Is the millisievert to microsievert conversion exact?
Yes. Both millisievert and microsievert are defined by fixed standards rather than physical artifacts, so the factor of 1000 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.