Convert Micrograys to Milligrays (µGy to mGy)
1 microgray (µGy) = 0.001 milligrays (mGy). 1 mGy = 1000 µGy. Example: 15 µGy = 15 × 0.001 = 0.015 mGy.
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1 µGy = 0.001 mGy
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk microgray to milligray converter to paste a column from Excel.
How to Convert Microgray to Milligray
- 1 µGy = 0.001 mGy
- 1 mGy = 1000 µGy
- Example: convert 15 µGy to mGy: 15 µGy = 15 × 0.001 mGy = 0.015 mGy
Formula
mGy = µGy ÷ 1000
Derivation from SI units:
- 1 µGy = 10⁻⁶ Gy.
- 1 mGy = 10⁻³ Gy.
- 1 µGy = 0.000001 Gy ÷ 0.001 Gy per mGy = 0.001 mGy
Both units are defined exactly, so the factor is exact. Microgray definition: microgray; Milligray definition: milligray.
Worked examples
- A reading of 0.5 µGy converts to 0.0005 mGy.
0.5 µGy × 0.001 = 0.0005 mGy - A value of 5 µGy is 0.005 mGy.
5 µGy × 0.001 = 0.005 mGy
Microgray to Milligray conversion table
| Micrograys (µGy) | Milligrays (mGy) |
|---|---|
| 0.001 µGy | 0.000001 mGy |
| 0.01 µGy | 0.00001 mGy |
| 0.1 µGy | 0.0001 mGy |
| 0.5 µGy | 0.0005 mGy |
| 1 µGy | 0.001 mGy |
| 2 µGy | 0.002 mGy |
| 5 µGy | 0.005 mGy |
| 10 µGy | 0.01 mGy |
| 50 µGy | 0.05 mGy |
| 100 µGy | 0.1 mGy |
Where it's used
Micrograys are used for dental and chest X-ray air kerma, while milligrays appear in CT dose index (CTDIvol). Both measure absorbed dose of ionising radiation, so the conversion is a fixed factor.
Microgray to other absorbed dose units
| Conversion | 1 µGy equals |
|---|---|
| microgray to milligray | 0.001 mGy |
| microgray to gray | 0.000001 Gy |
| microgray to rad | 0.0001 rad |
| microgray to centigray | 0.0001 cGy |
| microgray to kilogray | 1 × 10⁻⁹ kGy |
| microgray to millirad | 0.1 mrad |
Frequently asked questions
How many milligrays are in 1 microgray?
1 µGy = 0.001 mGy.
How do I convert micrograys to milligrays?
Multiply the value in µGy by 0.001, or divide it by 1000. For example, 15 µGy × 0.001 = 0.015 mGy.
Is the µGy to mGy conversion exact?
Yes. Both units are defined exactly, and 1 µGy is exactly 0.001 mGy.
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 Micrograys to Milligrays (µGy to mGy). Retrieved October 25, 2026, from https://scientificconverters.com/absorbed-dose/micrograys-to-milligrays/
IEEE
Scientific Converters, "Convert Micrograys to Milligrays (µGy to mGy)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/absorbed-dose/micrograys-to-milligrays/