How to convert milligrays to grays
Gy = mGy × 0.001Multiply the value in milligrays by 0.001. To go the other way, multiply by 1,000 (or divide by 0.001).
A milligray is smaller than a gray: it takes 1,000 milligrays to make one gray.
Worked examples
- 1 milligray1 mGy × 0.001 = 0.001 Gy
- 5 milligrays5 mGy × 0.001 = 0.005 Gy
- 10 milligrays10 mGy × 0.001 = 0.01 Gy
- 20 milligrays20 mGy × 0.001 = 0.02 Gy
- 100 milligrays100 mGy × 0.001 = 0.1 Gy
Milligrays to grays conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Milligrays (mGy) | Grays (Gy) |
|---|---|
| 0.1 mGy | 0.0001 Gy |
| 0.25 mGy | 0.00025 Gy |
| 0.5 mGy | 0.0005 Gy |
| 1 mGy | 0.001 Gy |
| 2 mGy | 0.002 Gy |
| 3 mGy | 0.003 Gy |
| 4 mGy | 0.004 Gy |
| 5 mGy | 0.005 Gy |
| 6 mGy | 0.006 Gy |
| 7 mGy | 0.007 Gy |
| 8 mGy | 0.008 Gy |
| 9 mGy | 0.009 Gy |
| 10 mGy | 0.01 Gy |
| Milligrays (mGy) | Grays (Gy) |
|---|---|
| 12 mGy | 0.012 Gy |
| 15 mGy | 0.015 Gy |
| 20 mGy | 0.02 Gy |
| 25 mGy | 0.025 Gy |
| 30 mGy | 0.03 Gy |
| 40 mGy | 0.04 Gy |
| 50 mGy | 0.05 Gy |
| 75 mGy | 0.075 Gy |
| 100 mGy | 0.1 Gy |
| 250 mGy | 0.25 Gy |
| 500 mGy | 0.5 Gy |
| 1,000 mGy | 1 Gy |
About the units
Milligray (mGy)
A chest CT delivers on the order of a few to ten mGy. One milligray equals 0.001 grays (Gy).
Gray (Gy)
One joule of radiation energy absorbed per kilogram.
Frequently asked questions
How many grays are in one milligray?
There are 0.001 grays in one milligray, and this value is exact by definition.
How do I convert milligrays to grays?
Multiply the number of milligrays by 0.001. For example, 10 mGy × 0.001 = 0.01 Gy.
How many milligrays are in one gray?
One gray equals 1,000 milligrays. That is the reverse factor, 1 ÷ 0.001.
What is 10 milligrays in grays?
10 mGy = 0.01 Gy.
Is this mGy to Gy converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.