Convert Milligrays to Kilograys (mGy to kGy)
1 milligray (mGy) = 0.000001 kilograys (kGy). 1 kGy = 1000000 mGy. Example: 15 mGy = 15 × 0.000001 = 0.000015 kGy.
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1 mGy = 0.000001 kGy
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk milligray to kilogray converter to paste a column from Excel.
How to Convert Milligray to Kilogray
- 1 mGy = 0.000001 kGy
- 1 kGy = 1000000 mGy
- Example: convert 15 mGy to kGy: 15 mGy = 15 × 0.000001 kGy = 0.000015 kGy
Formula
kGy = mGy ÷ 1000000
Derivation from SI units:
- 1 mGy = 10⁻³ Gy.
- 1 kGy = 10³ Gy.
- 1 mGy = 0.001 Gy ÷ 1000 Gy per kGy = 0.000001 kGy
Both units are defined exactly, so the factor is exact. Milligray definition: milligray; Kilogray definition: kilogray.
Worked examples
- A reading of 0.5 mGy converts to 5 × 10⁻⁷ kGy.
0.5 mGy × 0.000001 = 5 × 10⁻⁷ kGy - A value of 5 mGy is 0.000005 kGy.
5 mGy × 0.000001 = 0.000005 kGy
Milligray to Kilogray conversion table
| Milligrays (mGy) | Kilograys (kGy) |
|---|---|
| 0.001 mGy | 1 × 10⁻⁹ kGy |
| 0.01 mGy | 1 × 10⁻⁸ kGy |
| 0.1 mGy | 1 × 10⁻⁷ kGy |
| 0.5 mGy | 5 × 10⁻⁷ kGy |
| 1 mGy | 0.000001 kGy |
| 2 mGy | 0.000002 kGy |
| 5 mGy | 0.000005 kGy |
| 10 mGy | 0.00001 kGy |
| 50 mGy | 0.00005 kGy |
| 100 mGy | 0.0001 kGy |
Where it's used
Milligrays are used for CT dose index (CTDIvol), while kilograys appear in sterilisation of medical devices (25 kGy). Both measure absorbed dose of ionising radiation, so the conversion is a fixed factor.
Milligray to other absorbed dose units
| Conversion | 1 mGy equals |
|---|---|
| milligray to kilogray | 0.000001 kGy |
| milligray to gray | 0.001 Gy |
| milligray to rad | 0.1 rad |
| milligray to microgray | 1000 µGy |
| milligray to centigray | 0.1 cGy |
| milligray to millirad | 100 mrad |
Frequently asked questions
How many kilograys are in 1 milligray?
1 mGy = 0.000001 kGy.
How do I convert milligrays to kilograys?
Multiply the value in mGy by 0.000001, or divide it by 1000000. For example, 15 mGy × 0.000001 = 0.000015 kGy.
Is the mGy to kGy conversion exact?
Yes. Both units are defined exactly, and 1 mGy is exactly 0.000001 kGy.
Sources
- 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 Milligrays to Kilograys (mGy to kGy). Retrieved October 25, 2026, from https://scientificconverters.com/absorbed-dose/milligrays-to-kilograys/
IEEE
Scientific Converters, "Convert Milligrays to Kilograys (mGy to kGy)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/absorbed-dose/milligrays-to-kilograys/