Convert Millirads to Kilograys (mrad to kGy)
1 millirad (mrad) = 1 × 10⁻⁸ kilograys (kGy). 1 kGy = 100000000 mrad. Example: 15 mrad = 15 × 1 × 10⁻⁸ = 1.5 × 10⁻⁷ kGy.
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1 mrad = 1e-8 kGy
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk millirad to kilogray converter to paste a column from Excel.
How to Convert Millirad to Kilogray
- 1 mrad = 1 × 10⁻⁸ kGy
- 1 kGy = 100000000 mrad
- Example: convert 15 mrad to kGy: 15 mrad = 15 × 1 × 10⁻⁸ kGy = 1.5 × 10⁻⁷ kGy
Formula
kGy = mrad ÷ 100000000
Derivation from SI units:
- 1 mrad = 10⁻⁵ Gy = 10 µGy.
- 1 kGy = 10³ Gy.
- 1 mrad = 0.00001 Gy ÷ 1000 Gy per kGy = 1 × 10⁻⁸ kGy
Both units are defined exactly, so the factor is exact. Millirad definition: millirad; Kilogray definition: kilogray.
Worked examples
- A reading of 0.5 mrad converts to 5 × 10⁻⁹ kGy.
0.5 mrad × 1 × 10⁻⁸ = 5 × 10⁻⁹ kGy - A value of 5 mrad is 5 × 10⁻⁸ kGy.
5 mrad × 1 × 10⁻⁸ = 5 × 10⁻⁸ kGy
Millirad to Kilogray conversion table
| Millirads (mrad) | Kilograys (kGy) |
|---|---|
| 0.001 mrad | 1 × 10⁻¹¹ kGy |
| 0.01 mrad | 1 × 10⁻¹⁰ kGy |
| 0.1 mrad | 1 × 10⁻⁹ kGy |
| 0.5 mrad | 5 × 10⁻⁹ kGy |
| 1 mrad | 1 × 10⁻⁸ kGy |
| 2 mrad | 2 × 10⁻⁸ kGy |
| 5 mrad | 5 × 10⁻⁸ kGy |
| 10 mrad | 1 × 10⁻⁷ kGy |
| 50 mrad | 5 × 10⁻⁷ kGy |
| 100 mrad | 0.000001 kGy |
Where it's used
Millirads are used for older X-ray dose figures, while kilograys appear in sterilisation of medical devices (25 kGy). Both measure absorbed dose of ionising radiation, so the conversion is a fixed factor.
Millirad to other absorbed dose units
| Conversion | 1 mrad equals |
|---|---|
| millirad to kilogray | 1 × 10⁻⁸ kGy |
| millirad to gray | 0.00001 Gy |
| millirad to milligray | 0.01 mGy |
| millirad to rad | 0.001 rad |
| millirad to microgray | 10 µGy |
| millirad to centigray | 0.001 cGy |
Frequently asked questions
How many kilograys are in 1 millirad?
1 mrad = 1 × 10⁻⁸ kGy.
How do I convert millirads to kilograys?
Multiply the value in mrad by 1 × 10⁻⁸, or divide it by 100000000. For example, 15 mrad × 1 × 10⁻⁸ = 1.5 × 10⁻⁷ kGy.
Is the mrad to kGy conversion exact?
Yes. Both units are defined exactly, and 1 mrad is exactly 1 × 10⁻⁸ 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 Millirads to Kilograys (mrad to kGy). Retrieved October 25, 2026, from https://scientificconverters.com/absorbed-dose/millirads-to-kilograys/
IEEE
Scientific Converters, "Convert Millirads to Kilograys (mrad to kGy)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/absorbed-dose/millirads-to-kilograys/