Microgray is 0.000001 gray units.
Micrograys to Milligrays Converter — uGy to mGy
Convert Microgray (uGy) to Milligray (mGy) using the exact conversion factor (1 microgray = 0.001 milligray). See the formula, worked examples, and conversion table.
Micrograys to Milligrays 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.
Milligray is 0.001 gray units.
Result = input x 1e-6 / 0.001.
Absorbed Dose units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Micrograys to Milligrays
Microgray and Milligray 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: Microgray is 0.000001 gray units, and milligray is 0.001 gray units.
Formula
milligrays = micrograys × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 microgray equals 0.000001 base units, and 1 milligray equals 0.001 base units, so dividing one by the other gives the direct microgray-to-milligray factor of 0.001.
Simple example
1 uGy × 0.001 = 0.001 mGy
1 microgray = 0.001 milligrays.
Real-world example
10 uGy × 0.001 = 0.01 mGy
10 micrograys = 0.01 milligrays.
Conversion table
| Microgray (uGy) | Milligray (mGy) |
|---|---|
| 0.001 uGy | 0.000001 mGy |
| 0.01 uGy | 0.00001 mGy |
| 0.1 uGy | 0.0001 mGy |
| 1 uGy | 0.001 mGy |
| 10 uGy | 0.01 mGy |
| 100 uGy | 0.1 mGy |
Reverse conversion: Milligray to Microgray
0.001 mGy × 1000 = 1 uGy
0.001 milligrays = 1 microgray.
micrograys = milligrays × 1000
For a page dedicated to this direction, see Milligray to Microgray.
Understanding the Microgray (uGy)
Microgray is 0.000001 gray units.
Understanding the Milligray (mGy)
Milligray is 0.001 gray units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many milligrays are in 1 microgray?
1 microgray equals 0.001 milligrays, using the exact defined conversion factor rather than an estimate.
How do I convert microgray to milligray?
Multiply the microgray value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert milligray back to microgray?
Use the reverse factor: 1 milligray equals 1,000 micrograys. You can also use the swap control in the converter above to flip the direction instantly.
What is a microgray?
Microgray (uGy) is a unit of radiation.
What is a milligray?
Milligray (mGy) is a unit of radiation.
Is the microgray to milligray conversion exact?
Yes. Both microgray and milligray are defined by fixed standards rather than physical artifacts, so the factor of 0.001 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.