Nanosievert is 1e-9 sievert units.
Nanosieverts to Millisieverts Converter — nSv to mSv
Convert Nanosievert (nSv) to Millisievert (mSv) using the exact conversion factor (1 nanosievert = 0.000001 millisievert). See the formula, worked examples, and conversion table.
Nanosieverts 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-9 / 0.001.
Equivalent Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Nanosieverts to Millisieverts
Nanosievert 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: Nanosievert is 1e-9 sievert units, and millisievert is 0.001 sievert units.
Formula
millisieverts = nanosieverts × 0.000001
This factor comes from each unit's defined relationship to the category's base unit: 1 nanosievert equals 1e-9 base units, and 1 millisievert equals 0.001 base units, so dividing one by the other gives the direct nanosievert-to-millisievert factor of 0.000001.
Simple example
1 nSv × 0.000001 = 0.000001 mSv
1 nanosievert = 0.000001 millisieverts.
Real-world example
10 nSv × 0.000001 = 0.00001 mSv
10 nanosieverts = 0.00001 millisieverts.
Conversion table
| Nanosievert (nSv) | Millisievert (mSv) |
|---|---|
| 0.001 nSv | 1e-9 mSv |
| 0.01 nSv | 1e-8 mSv |
| 0.1 nSv | 1e-7 mSv |
| 1 nSv | 0.000001 mSv |
| 10 nSv | 0.00001 mSv |
| 100 nSv | 0.0001 mSv |
Reverse conversion: Millisievert to Nanosievert
0.000001 mSv × 1000000 = 1 nSv
0.000001 millisieverts = 1 nanosievert.
nanosieverts = millisieverts × 1000000
For a page dedicated to this direction, see Millisievert to Nanosievert.
Understanding the Nanosievert (nSv)
Nanosievert is 1e-9 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 nanosievert?
1 nanosievert equals 0.000001 millisieverts, using the exact defined conversion factor rather than an estimate.
How do I convert nanosievert to millisievert?
Multiply the nanosievert value by 0.000001. The converter above does this instantly to whatever precision you set.
How do I convert millisievert back to nanosievert?
Use the reverse factor: 1 millisievert equals 1,000,000 nanosieverts. You can also use the swap control in the converter above to flip the direction instantly.
What is a nanosievert?
Nanosievert (nSv) is a unit of radiation.
What is a millisievert?
Millisievert (mSv) is a unit of radiation.
Is the nanosievert to millisievert conversion exact?
Yes. Both nanosievert and millisievert are defined by fixed standards rather than physical artifacts, so the factor of 0.000001 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.