Convert Milligray to Gray
Use this free converter to change milligray (mGy) into gray (Gy). Milligray and gray both measure radiation (absorbed dose). As a quick reference, 1 mGy equals 0.001 Gy, and 1 Gy equals 1000 mGy.
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Gray (Gy)
0.001
1 mGy = 0.001 Gy
Radiation (Absorbed Dose) conversion table
| Milligray | Gray |
|---|---|
| 0.01 | 0.00001 |
| 0.1 | 0.0001 |
| 0.5 | 0.0005 |
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 5 | 0.005 |
| 10 | 0.01 |
| 20 | 0.02 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
| 1,000 | 1 |
How to convert Milligray to Gray
Multiply the milligray value by 0.001 to get gray.
- Enter the number of milligray you want to convert.
- The converter instantly shows the equivalent value in gray.
- Worked example: 15 mGy × 0.001 = 0.015 Gy.
- Use the swap button to reverse the conversion (gray to milligray).
About these units
Milligray (mGy)
- Definition
- A milligray (mGy) is one thousandth of a gray.
- History
- A metric sub-multiple of the gray used for lower diagnostic doses.
- Current use
- CT scans typically deliver organ doses of 10–30 mGy; milligray is standard in diagnostic radiology.
Gray (Gy)
- Definition
- The gray (Gy) is the SI unit of absorbed radiation dose, equal to one joule of energy deposited per kilogram of matter.
- History
- Named after British radiobiologist Louis Harold Gray and adopted by the CGPM in 1975, replacing the older rad.
- Current use
- Grays describe doses in radiation therapy, nuclear accidents, and radiobiology research.
Frequently asked questions
How many gray are in a milligray?
There are 0.001 Gy in 1 mGy. To convert, multiply the number of milligray by 0.001.
How do I convert milligray to gray?
Multiply the milligray value by 0.001 to get gray. For example, 10 mGy = 0.01 Gy.
Is this milligray-to-gray converter free?
Yes. This converter is completely free, runs entirely in your browser, and requires no sign-up. Your inputs never leave your device.
Convert Milligray to other radiation (absorbed dose) units
| Unit | 1 Milligray equals |
|---|---|
| Gray (Gy) | 0.001 Gy |
| Centigray (cGy) | 0.1 cGy |
| Microgray (µGy) | 1000 µGy |
| Rad (rad) | 0.1 rad |