Milligray is 0.001 gray units.
Milligrays to Kilograys Converter — mGy to kGy
Convert Milligray (mGy) to Kilogray (kGy) using the exact conversion factor (1 milligray = 0.000001 kilogray). See the formula, worked examples, and conversion table.
Milligrays to Kilograys 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.
Kilogray is 1000 gray units.
Result = input x 0.001 / 1000.
Absorbed Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Milligrays to Kilograys
Milligray and Kilogray 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: Milligray is 0.001 gray units, and kilogray is 1000 gray units.
Formula
kilograys = milligrays × 0.000001
This factor comes from each unit's defined relationship to the category's base unit: 1 milligray equals 0.001 base units, and 1 kilogray equals 1000 base units, so dividing one by the other gives the direct milligray-to-kilogray factor of 0.000001.
Simple example
1 mGy × 0.000001 = 0.000001 kGy
1 milligray = 0.000001 kilograys.
Real-world example
10 mGy × 0.000001 = 0.00001 kGy
10 milligrays = 0.00001 kilograys.
Conversion table
| Milligray (mGy) | Kilogray (kGy) |
|---|---|
| 0.001 mGy | 1e-9 kGy |
| 0.01 mGy | 1e-8 kGy |
| 0.1 mGy | 1e-7 kGy |
| 1 mGy | 0.000001 kGy |
| 10 mGy | 0.00001 kGy |
| 100 mGy | 0.0001 kGy |
Reverse conversion: Kilogray to Milligray
0.000001 kGy × 1000000 = 1 mGy
0.000001 kilograys = 1 milligray.
milligrays = kilograys × 1000000
For a page dedicated to this direction, see Kilogray to Milligray.
Understanding the Milligray (mGy)
Milligray is 0.001 gray units.
Understanding the Kilogray (kGy)
Kilogray is 1000 gray units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many kilograys are in 1 milligray?
1 milligray equals 0.000001 kilograys, using the exact defined conversion factor rather than an estimate.
How do I convert milligray to kilogray?
Multiply the milligray value by 0.000001. The converter above does this instantly to whatever precision you set.
How do I convert kilogray back to milligray?
Use the reverse factor: 1 kilogray equals 1,000,000 milligrays. You can also use the swap control in the converter above to flip the direction instantly.
What is a milligray?
Milligray (mGy) is a unit of radiation.
What is a kilogray?
Kilogray (kGy) is a unit of radiation.
Is the milligray to kilogray conversion exact?
Yes. Both milligray and kilogray are defined by fixed standards rather than physical artifacts, so the factor of 0.000001 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.