Femtogray is 1e-15 gray units.
Femtograys to Attograys Converter — fGy to aGy
Convert Femtogray (fGy) to Attogray (aGy) using the exact conversion factor (1 femtogray = 1,000 attogray). See the formula, worked examples, and conversion table.
Femtograys to Attograys 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.
Attogray is 1e-18 gray units.
Result = input x 1e-15 / 1e-18.
Absorbed Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Femtograys to Attograys
Femtogray and Attogray 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 attogray is 1e-18 gray units.
Formula
attograys = femtograys × 1000
This factor comes from each unit's defined relationship to the category's base unit: 1 femtogray equals 1e-15 base units, and 1 attogray equals 1e-18 base units, so dividing one by the other gives the direct femtogray-to-attogray factor of 1000.
Simple example
1 fGy × 1000 = 1,000 aGy
1 femtogray = 1,000 attograys.
Real-world example
10 fGy × 1000 = 10,000 aGy
10 femtograys = 10,000 attograys.
Conversion table
| Femtogray (fGy) | Attogray (aGy) |
|---|---|
| 0.001 fGy | 1 aGy |
| 0.01 fGy | 10 aGy |
| 0.1 fGy | 100 aGy |
| 1 fGy | 1,000 aGy |
| 10 fGy | 10,000 aGy |
| 100 fGy | 100,000 aGy |
Reverse conversion: Attogray to Femtogray
1 aGy × 0.001 = 0.001 fGy
1 attogray = 0.001 femtograys.
femtograys = attograys × 0.001
For a page dedicated to this direction, see Attogray to Femtogray.
Understanding the Femtogray (fGy)
Femtogray is 1e-15 gray units.
Understanding the Attogray (aGy)
Attogray is 1e-18 gray units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many attograys are in 1 femtogray?
1 femtogray equals 1,000 attograys, using the exact defined conversion factor rather than an estimate.
How do I convert femtogray to attogray?
Multiply the femtogray value by 1000. The converter above does this instantly to whatever precision you set.
How do I convert attogray back to femtogray?
Use the reverse factor: 1 attogray equals 0.001 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 attogray?
Attogray (aGy) is a unit of radiation.
Is the femtogray to attogray conversion exact?
Yes. Both femtogray and attogray are defined by fixed standards rather than physical artifacts, so the factor of 1000 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.