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