Convert Centigrays to Milligrays (cGy to mGy)
1 centigray (cGy) = 10 milligrays (mGy). 1 mGy = 0.1 cGy. Example: 15 cGy = 15 × 10 = 150 mGy.
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1 cGy = 10 mGy
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk centigray to milligray converter to paste a column from Excel.
How to Convert Centigray to Milligray
- 1 cGy = 10 mGy
- 1 mGy = 0.1 cGy
- Example: convert 15 cGy to mGy: 15 cGy = 15 × 10 mGy = 150 mGy
Formula
mGy = cGy × 10
Derivation from SI units:
- 1 cGy = 0.01 Gy = 1 rad.
- 1 mGy = 10⁻³ Gy.
- 1 cGy = 0.01 Gy ÷ 0.001 Gy per mGy = 10 mGy
Both units are defined exactly, so the factor is exact. Centigray definition: centigray; Milligray definition: milligray.
Worked examples
- A reading of 100 cGy converts to 1000 mGy.
100 cGy × 10 = 1000 mGy - A value of 500 cGy is 5000 mGy.
500 cGy × 10 = 5000 mGy
Centigray to Milligray conversion table
| Centigrays (cGy) | Milligrays (mGy) |
|---|---|
| 1 cGy | 10 mGy |
| 10 cGy | 100 mGy |
| 50 cGy | 500 mGy |
| 100 cGy | 1000 mGy |
| 180 cGy | 1800 mGy |
| 200 cGy | 2000 mGy |
| 500 cGy | 5000 mGy |
| 1000 cGy | 10000 mGy |
| 5000 cGy | 50000 mGy |
| 7000 cGy | 70000 mGy |
Where it's used
Centigrays are used for radiotherapy plans (e.g. 200 cGy per fraction), while milligrays appear in CT dose index (CTDIvol). Both measure absorbed dose of ionising radiation, so the conversion is a fixed factor.
Centigray to other absorbed dose units
| Conversion | 1 cGy equals |
|---|---|
| centigray to milligray | 10 mGy |
| centigray to gray | 0.01 Gy |
| centigray to rad | 1 rad |
| centigray to microgray | 10000 µGy |
| centigray to kilogray | 0.00001 kGy |
| centigray to millirad | 1000 mrad |
Frequently asked questions
How many milligrays are in 1 centigray?
1 cGy = 10 mGy.
How do I convert centigrays to milligrays?
Multiply the value in cGy by 10. For example, 15 cGy × 10 = 150 mGy.
Is the cGy to mGy conversion exact?
Yes. Both units are defined exactly, and 1 cGy is exactly 10 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 Centigrays to Milligrays (cGy to mGy). Retrieved October 25, 2026, from https://scientificconverters.com/absorbed-dose/centigrays-to-milligrays/
IEEE
Scientific Converters, "Convert Centigrays to Milligrays (cGy to mGy)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/absorbed-dose/centigrays-to-milligrays/