Convert Rads to Kilograys (rad to kGy)
1 rad = 0.00001 kilograys (kGy). 1 kGy = 100000 rad. Example: 15 rad = 15 × 0.00001 = 0.00015 kGy.
Also searched as rads to kGy, rads in kGy, rads into kilograys, rad to kGy, rad in kilograys, rad into kilogray, rad to kilogray, rad to kilograys converter and how many kilograys in a rad.
1 rad = 0.00001 kGy
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk rad to kilogray converter to paste a column from Excel.
How to Convert Rad to Kilogray
- 1 rad = 0.00001 kGy
- 1 kGy = 100000 rad
- Example: convert 15 rad to kGy: 15 rad = 15 × 0.00001 kGy = 0.00015 kGy
Formula
kGy = rad ÷ 100000
Derivation from SI units:
- 1 rad = 100 erg/g = 0.01 Gy.
- 1 kGy = 10³ Gy.
- 1 rad = 0.01 Gy ÷ 1000 Gy per kGy = 0.00001 kGy
Both units are defined exactly, so the factor is exact. Rad definition: rad; Kilogray definition: kilogray.
Worked examples
- A reading of 0.5 rad converts to 0.000005 kGy.
0.5 rad × 0.00001 = 0.000005 kGy - A value of 5 rad is 0.00005 kGy.
5 rad × 0.00001 = 0.00005 kGy
Rad to Kilogray conversion table
| Rads (rad) | Kilograys (kGy) |
|---|---|
| 0.001 rad | 1 × 10⁻⁸ kGy |
| 0.01 rad | 1 × 10⁻⁷ kGy |
| 0.1 rad | 0.000001 kGy |
| 0.5 rad | 0.000005 kGy |
| 1 rad | 0.00001 kGy |
| 2 rad | 0.00002 kGy |
| 5 rad | 0.00005 kGy |
| 10 rad | 0.0001 kGy |
| 50 rad | 0.0005 kGy |
| 100 rad | 0.001 kGy |
Where it's used
Rads are used for US radiation safety and older literature, while kilograys appear in sterilisation of medical devices (25 kGy). Both measure absorbed dose of ionising radiation, so the conversion is a fixed factor.
Rad to other absorbed dose units
| Conversion | 1 rad equals |
|---|---|
| rad to kilogray | 0.00001 kGy |
| rad to gray | 0.01 Gy |
| rad to milligray | 10 mGy |
| rad to microgray | 10000 µGy |
| rad to centigray | 1 cGy |
| rad to millirad | 1000 mrad |
Frequently asked questions
How many kilograys are in 1 rad?
1 rad = 0.00001 kGy.
How do I convert rads to kilograys?
Multiply the value in rad by 0.00001, or divide it by 100000. For example, 15 rad × 0.00001 = 0.00015 kGy.
Is the rad to kGy conversion exact?
Yes. Both units are defined exactly, and 1 rad is exactly 0.00001 kGy.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "rad (absorbed dose)".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4 (becquerel, gray, sievert, lux) and Table 2 (candela).
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Rads to Kilograys (rad to kGy). Retrieved October 25, 2026, from https://scientificconverters.com/absorbed-dose/rads-to-kilograys/
IEEE
Scientific Converters, "Convert Rads to Kilograys (rad to kGy)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/absorbed-dose/rads-to-kilograys/