Milligray (mGy)
A milligray is one thousandth of a gray. Diagnostic imaging doses (CT dose index, mammography) are reported in mGy.
Symbol: mGy
Quantity: absorbed dose of ionising radiation
SI relation: 1 mGy = 0.001 Gy (exact)
Derivation: 1 mGy = 10⁻³ Gy.
Exact: yes, by definition
Typical uses
- CT dose index (CTDIvol)
- Mammography glandular dose
Convert milligrays to other units
| Conversion | 1 mGy equals | Reverse |
|---|---|---|
| milligray to gray | 0.001 Gy | gray to milligray |
| milligray to rad | 0.1 rad | rad to milligray |
| milligray to microgray | 1000 µGy | microgray to milligray |
| milligray to centigray | 0.1 cGy | centigray to milligray |
| milligray to kilogray | 0.000001 kGy | kilogray to milligray |
| milligray to millirad | 100 mrad | millirad to milligray |
Open the Absorbed Radiation Dose Converter to convert any value between all units.
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). Milligray (mGy). Retrieved October 25, 2026, from https://scientificconverters.com/units/milligray/
IEEE
Scientific Converters, "Milligray (mGy)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/units/milligray/