Attogray is 1e-18 gray units.
Attograys to Femtograys Converter — aGy to fGy
Convert Attogray (aGy) to Femtogray (fGy) using the exact conversion factor (1 attogray = 0.001 femtogray). See the formula, worked examples, and conversion table.
Attograys 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-18 / 1e-15.
Absorbed Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Attograys to Femtograys
Attogray 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: Attogray is 1e-18 gray units, and femtogray is 1e-15 gray units.
Formula
femtograys = attograys × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 attogray equals 1e-18 base units, and 1 femtogray equals 1e-15 base units, so dividing one by the other gives the direct attogray-to-femtogray factor of 0.001.
Simple example
1 aGy × 0.001 = 0.001 fGy
1 attogray = 0.001 femtograys.
Real-world example
10 aGy × 0.001 = 0.01 fGy
10 attograys = 0.01 femtograys.
Conversion table
| Attogray (aGy) | Femtogray (fGy) |
|---|---|
| 0.001 aGy | 0.000001 fGy |
| 0.01 aGy | 0.00001 fGy |
| 0.1 aGy | 0.0001 fGy |
| 1 aGy | 0.001 fGy |
| 10 aGy | 0.01 fGy |
| 100 aGy | 0.1 fGy |
Reverse conversion: Femtogray to Attogray
0.001 fGy × 1000 = 1 aGy
0.001 femtograys = 1 attogray.
attograys = femtograys × 1000
For a page dedicated to this direction, see Femtogray to Attogray.
Understanding the Attogray (aGy)
Attogray is 1e-18 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 attogray?
1 attogray equals 0.001 femtograys, using the exact defined conversion factor rather than an estimate.
How do I convert attogray to femtogray?
Multiply the attogray value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert femtogray back to attogray?
Use the reverse factor: 1 femtogray equals 1,000 attograys. You can also use the swap control in the converter above to flip the direction instantly.
What is a attogray?
Attogray (aGy) is a unit of radiation.
What is a femtogray?
Femtogray (fGy) is a unit of radiation.
Is the attogray to femtogray conversion exact?
Yes. Both attogray and femtogray are defined by fixed standards rather than physical artifacts, so the factor of 0.001 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.