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