Convert Milliroentgen to Centigray
Convert milliroentgens to centigrays by entering a value below.
How to Convert Milliroentgens to Centigrays
The milliroentgen and centigray are both units of radiation dose. 1 centigray equals 1140.2508552 milliroentgens. This means to convert milliroentgens to centigrays, you divide by 1140.2508552.
Formula
Step-by-Step Example
Convert 5 mR to centigrays:
We need to convert milliroentgens to centigrays
Since 1 cGy = 1140.2508552 mR, divide by 1140.2508552
5 ÷ 1140.2508552 = 0.004385
5 mR = 0.004385 cGy
Milliroentgen to Centigray Conversion Table
Quick reference table for common milliroentgen to centigray conversions. Click any value for detailed calculation.
| Milliroentgens (mR) | Centigrays (cGy) |
|---|---|
| 0.1 mR | 8.77e-5 cGy |
| 0.5 mR | 0.0004385 cGy |
| 1 mR | 0.000877 cGy |
| 2 mR | 0.001754 cGy |
| 5 mR | 0.004385 cGy |
| 10 mR | 0.00877 cGy |
| 25 mR | 0.021925 cGy |
| 50 mR | 0.04385 cGy |
| 100 mR | 0.0877 cGy |
About These Units
Milliroentgen (mR)
A milliroentgen (mR) equals 0.001 roentgen. Radiation survey meters often display mR/h for monitoring X-ray and gamma fields. Natural background: 10-20 mR/year. Typical survey meter range: 0-1000 mR/h.
Centigray (cGy)
A centigray (cGy) equals 0.01 gray and exactly equals 1 rad. Standard unit in radiation oncology. Typical fraction: 180-200 cGy/day. Total treatment: 4,000-8,000 cGy. Prostate: 7,000-8,000 cGy. Breast: 5,000-6,000 cGy.
Frequently Asked Questions
How do I convert milliroentgens to centigrays?
To convert milliroentgens to centigrays, divide the value by 1140.2508552. For example, 10 mR = 0.00877 cGy.
How many centigrays are in 1 milliroentgen?
1 milliroentgen equals 0.000877 centigrays.
What is the formula for milliroentgens to centigrays?
The formula is: cGy = mR ÷ 1140.2508552.