Kilogray is 1000 gray units.
Kilogray to Femtogray
Convert Kilogray (kGy) to Femtogray (fGy) instantly. Free online radiation converter with formulas, tables and examples.
Reserved for a responsive leaderboard above the conversion details.
Professional calculator style
World-scale conversion engine
30+ categories
6,500+ units
Instant results
Offline ready
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.
fGy = kGy × 1e+18
Results update instantly for Kilogray to Femtogray conversions.
Reserved above the conversion cards and below the converter.
Formula
1 Kilogray = 1e+18 Femtogray
fGy = kGy × 1e+18
kGy = fGy ÷ 1e+18
Conversion table
| 1 kGy | 1e+18 fGy |
| 2 kGy | 2e+18 fGy |
| 5 kGy | 5e+18 fGy |
| 10 kGy | 1e+19 fGy |
| 20 kGy | 2e+19 fGy |
| 50 kGy | 5e+19 fGy |
| 100 kGy | 1e+20 fGy |
Related conversions
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many Femtograys are in one Kilogray?
One Kilogray equals 1e+18 Femtograys.
How do I convert Kilogray to Femtogray?
Multiply the number of Kilograys by 1e+18 to get Femtograys. To go the other way, multiply Femtograys by 1e-18 (or divide by 1e+18) to get Kilograys.
Is this conversion exact?
Yes. This conversion uses the exact defined relationship between Kilogray and Femtogray, so the result shown is mathematically precise (rounded only for display).
When is Kilogray to Femtogray conversion commonly used?
It is commonly used in nuclear medicine, radiation safety, health physics, and scientific research involving radioactivity and radiation dose.
Reserved between the FAQ and the article so the page stays balanced.
About this conversion
Kilogray and Femtogray are units used in the radiation family of measurements. Both units measure absorbed radiation dose (energy deposited per unit mass). This converter uses the precise relationship 1 Kilogray = 1e+18 Femtograys (equivalently 1 Femtogray = 1e-18 Kilograys), so results stay accurate for nuclear medicine, radiation safety, health physics, and scientific research.