Nanosievert is 1e-9 sievert units.
Nanosieverts to Microsieverts Converter — nSv to uSv
Convert Nanosievert (nSv) to Microsievert (uSv) using the exact conversion factor (1 nanosievert = 0.001 microsievert). See the formula, worked examples, and conversion table.
Nanosieverts 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 1e-9 / 1e-6.
Equivalent Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Nanosieverts to Microsieverts
Nanosievert 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: Nanosievert is 1e-9 sievert units, and microsievert is 0.000001 sievert units.
Formula
microsieverts = nanosieverts × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 nanosievert equals 1e-9 base units, and 1 microsievert equals 0.000001 base units, so dividing one by the other gives the direct nanosievert-to-microsievert factor of 0.001.
Simple example
1 nSv × 0.001 = 0.001 uSv
1 nanosievert = 0.001 microsieverts.
Real-world example
10 nSv × 0.001 = 0.01 uSv
10 nanosieverts = 0.01 microsieverts.
Conversion table
| Nanosievert (nSv) | Microsievert (uSv) |
|---|---|
| 0.001 nSv | 0.000001 uSv |
| 0.01 nSv | 0.00001 uSv |
| 0.1 nSv | 0.0001 uSv |
| 1 nSv | 0.001 uSv |
| 10 nSv | 0.01 uSv |
| 100 nSv | 0.1 uSv |
Reverse conversion: Microsievert to Nanosievert
0.001 uSv × 1000 = 1 nSv
0.001 microsieverts = 1 nanosievert.
nanosieverts = microsieverts × 1000
For a page dedicated to this direction, see Microsievert to Nanosievert.
Understanding the Nanosievert (nSv)
Nanosievert is 1e-9 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 nanosievert?
1 nanosievert equals 0.001 microsieverts, using the exact defined conversion factor rather than an estimate.
How do I convert nanosievert to microsievert?
Multiply the nanosievert value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert microsievert back to nanosievert?
Use the reverse factor: 1 microsievert equals 1,000 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 microsievert?
Microsievert (uSv) is a unit of radiation.
Is the nanosievert to microsievert conversion exact?
Yes. Both nanosievert and microsievert 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.