Femtogray is 1e-15 gray units.
Femtograys to Zeptograys Converter — fGy to zGy
Convert Femtogray (fGy) to Zeptogray (zGy) using the exact conversion factor (1 femtogray = 1,000,000 zeptogray). See the formula, worked examples, and conversion table.
Femtograys to Zeptograys 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.
Zeptogray is 1e-21 gray units.
Result = input x 1e-15 / 1e-21.
Absorbed Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Femtograys to Zeptograys
Femtogray and Zeptogray 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 zeptogray is 1e-21 gray units.
Formula
zeptograys = femtograys × 1000000
This factor comes from each unit's defined relationship to the category's base unit: 1 femtogray equals 1e-15 base units, and 1 zeptogray equals 1e-21 base units, so dividing one by the other gives the direct femtogray-to-zeptogray factor of 1000000.
Simple example
1 fGy × 1000000 = 1,000,000 zGy
1 femtogray = 1,000,000 zeptograys.
Real-world example
10 fGy × 1000000 = 10,000,000 zGy
10 femtograys = 10,000,000 zeptograys.
Conversion table
| Femtogray (fGy) | Zeptogray (zGy) |
|---|---|
| 0.001 fGy | 1,000 zGy |
| 0.01 fGy | 10,000 zGy |
| 0.1 fGy | 100,000 zGy |
| 1 fGy | 1,000,000 zGy |
| 10 fGy | 10,000,000 zGy |
| 100 fGy | 100,000,000 zGy |
Reverse conversion: Zeptogray to Femtogray
1 zGy × 1e-6 = 1e-6 fGy
1 zeptogray = 1e-6 femtograys.
femtograys = zeptograys × 1e-6
For a page dedicated to this direction, see Zeptogray to Femtogray.
Understanding the Femtogray (fGy)
Femtogray is 1e-15 gray units.
Understanding the Zeptogray (zGy)
Zeptogray is 1e-21 gray units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many zeptograys are in 1 femtogray?
1 femtogray equals 1,000,000 zeptograys, using the exact defined conversion factor rather than an estimate.
How do I convert femtogray to zeptogray?
Multiply the femtogray value by 1000000. The converter above does this instantly to whatever precision you set.
How do I convert zeptogray back to femtogray?
Use the reverse factor: 1 zeptogray equals 1e-6 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 zeptogray?
Zeptogray (zGy) is a unit of radiation.
Is the femtogray to zeptogray conversion exact?
Yes. Both femtogray and zeptogray 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.