Rontosievert is 1e-27 sievert units.
Rontosieverts to Femtosieverts Converter — rSv to fSv
Convert Rontosievert (rSv) to Femtosievert (fSv) using the exact conversion factor (1 rontosievert = 1e-12 femtosievert). See the formula, worked examples, and conversion table.
Rontosieverts 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-27 / 1e-15.
Equivalent Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Rontosieverts to Femtosieverts
Rontosievert 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: Rontosievert is 1e-27 sievert units, and femtosievert is 1e-15 sievert units.
Formula
femtosieverts = rontosieverts × 1e-12
This factor comes from each unit's defined relationship to the category's base unit: 1 rontosievert equals 1e-27 base units, and 1 femtosievert equals 1e-15 base units, so dividing one by the other gives the direct rontosievert-to-femtosievert factor of 1e-12.
Simple example
1 rSv × 1e-12 = 1e-12 fSv
1 rontosievert = 1e-12 femtosieverts.
Real-world example
10 rSv × 1e-12 = 1e-11 fSv
10 rontosieverts = 1e-11 femtosieverts.
Conversion table
| Rontosievert (rSv) | Femtosievert (fSv) |
|---|---|
| 0.001 rSv | 1e-15 fSv |
| 0.01 rSv | 1e-14 fSv |
| 0.1 rSv | 1e-13 fSv |
| 1 rSv | 1e-12 fSv |
| 10 rSv | 1e-11 fSv |
| 100 rSv | 1e-10 fSv |
Reverse conversion: Femtosievert to Rontosievert
1e-12 fSv × 1e+12 = 1 rSv
1e-12 femtosieverts = 1 rontosievert.
rontosieverts = femtosieverts × 1e+12
For a page dedicated to this direction, see Femtosievert to Rontosievert.
Understanding the Rontosievert (rSv)
Rontosievert is 1e-27 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 rontosievert?
1 rontosievert equals 1e-12 femtosieverts, using the exact defined conversion factor rather than an estimate.
How do I convert rontosievert to femtosievert?
Multiply the rontosievert value by 1e-12. The converter above does this instantly to whatever precision you set.
How do I convert femtosievert back to rontosievert?
Use the reverse factor: 1 femtosievert equals 1e+12 rontosieverts. You can also use the swap control in the converter above to flip the direction instantly.
What is a rontosievert?
Rontosievert (rSv) is a unit of radiation.
What is a femtosievert?
Femtosievert (fSv) is a unit of radiation.
Is the rontosievert to femtosievert conversion exact?
Yes. Both rontosievert and femtosievert are defined by fixed standards rather than physical artifacts, so the factor of 1e-12 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.