Radiation Dose
GytomGy
Convert grays (Gy) to milligrays (mGy).
Factor1 Gy = 1000 mGy
Converter
Gy
Accepts numbers or expressions, e.g. 150 + 14.7
Result
mGy
Rendered to 6 significant figures.
Formula
Formula
mGy = Gy × 1000
Multiply any value in grays by 1000 to obtain the value in milligrays.
Worked example
Convert 1 Gy to mGy.
- 01Start with 1 Gy.
- 02Multiply by the conversion factor: 1 × 1000 = 1000 mGy.
Result1 Gy = 1000 mGy
Conversion table
| Gy | mGy |
|---|---|
| 1 | 1000 |
| 2 | 2000 |
| 5 | 5000 |
| 10 | 10000 |
| 20 | 20000 |
| 50 | 50000 |
| 100 | 1.0000e+5 |
| 200 | 2.0000e+5 |
| 500 | 5.0000e+5 |
| 1000 | 1.0000e+6 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from Gy to mGy?
1 Gy equals 1000 mGy. To convert, multiply the value in grays by 1000.
How do I convert 1 Gy to mGy?
1 Gy = 1000 mGy. For any value, multiply by 1000.
How do I convert mGy back to Gy?
Divide by the same factor — or equivalently, multiply by 0.001. So 1 mGy = 0.001 Gy.
When would I need to convert gray to milligray?
Radiation absorbed-dose conversions between Gy and mGy are used in radiological protection, medical physics, and nuclear-industry health physics. Gray (Gy) is the SI standard; rad remains common in older US health-physics documentation (1 Gy = 100 rad).
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).