Microsievert is 0.000001 sievert units.
Microsieverts to Femtosieverts Converter — uSv to fSv
Convert Microsievert (uSv) to Femtosievert (fSv) using the exact conversion factor (1 microsievert = 1,000,000,000 femtosievert). See the formula, worked examples, and conversion table.
Microsieverts to Femtosieverts 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.
Femtosievert is 1e-15 sievert units.
Result = input x 1e-6 / 1e-15.
Equivalent Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Microsieverts to Femtosieverts
Microsievert and Femtosievert 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 femtosievert is 1e-15 sievert units.
Formula
femtosieverts = microsieverts × 1000000000
This factor comes from each unit's defined relationship to the category's base unit: 1 microsievert equals 0.000001 base units, and 1 femtosievert equals 1e-15 base units, so dividing one by the other gives the direct microsievert-to-femtosievert factor of 1000000000.
Simple example
1 uSv × 1000000000 = 1,000,000,000 fSv
1 microsievert = 1,000,000,000 femtosieverts.
Real-world example
10 uSv × 1000000000 = 10,000,000,000 fSv
10 microsieverts = 10,000,000,000 femtosieverts.
Conversion table
| Microsievert (uSv) | Femtosievert (fSv) |
|---|---|
| 0.001 uSv | 1,000,000 fSv |
| 0.01 uSv | 10,000,000 fSv |
| 0.1 uSv | 100,000,000 fSv |
| 1 uSv | 1,000,000,000 fSv |
| 10 uSv | 10,000,000,000 fSv |
| 100 uSv | 100,000,000,000 fSv |
Reverse conversion: Femtosievert to Microsievert
1 fSv × 1e-9 = 1e-9 uSv
1 femtosievert = 1e-9 microsieverts.
microsieverts = femtosieverts × 1e-9
For a page dedicated to this direction, see Femtosievert to Microsievert.
Understanding the Microsievert (uSv)
Microsievert is 0.000001 sievert units.
Understanding the Femtosievert (fSv)
Femtosievert is 1e-15 sievert units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many femtosieverts are in 1 microsievert?
1 microsievert equals 1,000,000,000 femtosieverts, using the exact defined conversion factor rather than an estimate.
How do I convert microsievert to femtosievert?
Multiply the microsievert value by 1000000000. The converter above does this instantly to whatever precision you set.
How do I convert femtosievert back to microsievert?
Use the reverse factor: 1 femtosievert equals 1e-9 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 femtosievert?
Femtosievert (fSv) is a unit of radiation.
Is the microsievert to femtosievert conversion exact?
Yes. Both microsievert and femtosievert are defined by fixed standards rather than physical artifacts, so the factor of 1000000000 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.