Convert Milligrays to Centigrays (mGy to cGy)
1 milligray (mGy) = 0.1 centigrays (cGy). 1 cGy = 10 mGy. Example: 15 mGy = 15 × 0.1 = 1.5 cGy.
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1 mGy = 0.1 cGy
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk milligray to centigray converter to paste a column from Excel.
How to Convert Milligray to Centigray
- 1 mGy = 0.1 cGy
- 1 cGy = 10 mGy
- Example: convert 15 mGy to cGy: 15 mGy = 15 × 0.1 cGy = 1.5 cGy
Formula
cGy = mGy ÷ 10
Derivation from SI units:
- 1 mGy = 10⁻³ Gy.
- 1 cGy = 0.01 Gy = 1 rad.
- 1 mGy = 0.001 Gy ÷ 0.01 Gy per cGy = 0.1 cGy
Both units are defined exactly, so the factor is exact. Milligray definition: milligray; Centigray definition: centigray.
Worked examples
- A reading of 0.5 mGy converts to 0.05 cGy.
0.5 mGy × 0.1 = 0.05 cGy - A value of 5 mGy is 0.5 cGy.
5 mGy × 0.1 = 0.5 cGy
Milligray to Centigray conversion table
| Milligrays (mGy) | Centigrays (cGy) |
|---|---|
| 0.001 mGy | 0.0001 cGy |
| 0.01 mGy | 0.001 cGy |
| 0.1 mGy | 0.01 cGy |
| 0.5 mGy | 0.05 cGy |
| 1 mGy | 0.1 cGy |
| 2 mGy | 0.2 cGy |
| 5 mGy | 0.5 cGy |
| 10 mGy | 1 cGy |
| 50 mGy | 5 cGy |
| 100 mGy | 10 cGy |
Where it's used
Milligrays are used for CT dose index (CTDIvol), while centigrays appear in radiotherapy plans (e.g. 200 cGy per fraction). Both measure absorbed dose of ionising radiation, so the conversion is a fixed factor.
Milligray to other absorbed dose units
| Conversion | 1 mGy equals |
|---|---|
| milligray to centigray | 0.1 cGy |
| milligray to gray | 0.001 Gy |
| milligray to rad | 0.1 rad |
| milligray to microgray | 1000 µGy |
| milligray to kilogray | 0.000001 kGy |
| milligray to millirad | 100 mrad |
Frequently asked questions
How many centigrays are in 1 milligray?
1 mGy = 0.1 cGy.
How do I convert milligrays to centigrays?
Multiply the value in mGy by 0.1, or divide it by 10. For example, 15 mGy × 0.1 = 1.5 cGy.
Is the mGy to cGy conversion exact?
Yes. Both units are defined exactly, and 1 mGy is exactly 0.1 cGy.
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 Milligrays to Centigrays (mGy to cGy). Retrieved October 25, 2026, from https://scientificconverters.com/absorbed-dose/milligrays-to-centigrays/
IEEE
Scientific Converters, "Convert Milligrays to Centigrays (mGy to cGy)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/absorbed-dose/milligrays-to-centigrays/