Femtosievert is 1e-15 sievert units.
Femtosieverts to Nanosieverts Converter — fSv to nSv
Convert Femtosievert (fSv) to Nanosievert (nSv) using the exact conversion factor (1 femtosievert = 0.000001 nanosievert). See the formula, worked examples, and conversion table.
Femtosieverts to Nanosieverts 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.
Nanosievert is 1e-9 sievert units.
Result = input x 1e-15 / 1e-9.
Equivalent Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Femtosieverts to Nanosieverts
Femtosievert and Nanosievert 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: Femtosievert is 1e-15 sievert units, and nanosievert is 1e-9 sievert units.
Formula
nanosieverts = femtosieverts × 0.000001
This factor comes from each unit's defined relationship to the category's base unit: 1 femtosievert equals 1e-15 base units, and 1 nanosievert equals 1e-9 base units, so dividing one by the other gives the direct femtosievert-to-nanosievert factor of 0.000001.
Simple example
1 fSv × 0.000001 = 0.000001 nSv
1 femtosievert = 0.000001 nanosieverts.
Real-world example
10 fSv × 0.000001 = 0.00001 nSv
10 femtosieverts = 0.00001 nanosieverts.
Conversion table
| Femtosievert (fSv) | Nanosievert (nSv) |
|---|---|
| 0.001 fSv | 1e-9 nSv |
| 0.01 fSv | 1e-8 nSv |
| 0.1 fSv | 1e-7 nSv |
| 1 fSv | 0.000001 nSv |
| 10 fSv | 0.00001 nSv |
| 100 fSv | 0.0001 nSv |
Reverse conversion: Nanosievert to Femtosievert
0.000001 nSv × 1000000 = 1 fSv
0.000001 nanosieverts = 1 femtosievert.
femtosieverts = nanosieverts × 1000000
For a page dedicated to this direction, see Nanosievert to Femtosievert.
Understanding the Femtosievert (fSv)
Femtosievert is 1e-15 sievert units.
Understanding the Nanosievert (nSv)
Nanosievert is 1e-9 sievert units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many nanosieverts are in 1 femtosievert?
1 femtosievert equals 0.000001 nanosieverts, using the exact defined conversion factor rather than an estimate.
How do I convert femtosievert to nanosievert?
Multiply the femtosievert value by 0.000001. The converter above does this instantly to whatever precision you set.
How do I convert nanosievert back to femtosievert?
Use the reverse factor: 1 nanosievert equals 1,000,000 femtosieverts. You can also use the swap control in the converter above to flip the direction instantly.
What is a femtosievert?
Femtosievert (fSv) is a unit of radiation.
What is a nanosievert?
Nanosievert (nSv) is a unit of radiation.
Is the femtosievert to nanosievert conversion exact?
Yes. Both femtosievert and nanosievert 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.