Convert Milliroentgen to Gray
Enter the number of milliroentgens that you want to convert to grays.
How to Convert Milliroentgens to Grays
The milliroentgen and gray are both units of radiation dose. 1 gray equals 114025.08552 milliroentgens. This means to convert milliroentgens to grays, you divide by 114025.08552.
Formula
Step-by-Step Example
Convert 5 mR to grays:
We need to convert milliroentgens to grays
Since 1 Gy = 114025.08552 mR, divide by 114025.08552
5 ÷ 114025.08552 = 4.385e-5
5 mR = 4.385e-5 Gy
Milliroentgen to Gray Conversion Table
Quick reference table for common milliroentgen to gray conversions. Click any value for detailed calculation.
| Milliroentgens (mR) | Grays (Gy) |
|---|---|
| 0.1 mR | 8.77e-7 Gy |
| 0.5 mR | 4.385e-6 Gy |
| 1 mR | 8.77e-6 Gy |
| 2 mR | 1.754e-5 Gy |
| 5 mR | 4.385e-5 Gy |
| 10 mR | 8.77e-5 Gy |
| 25 mR | 0.00021925 Gy |
| 50 mR | 0.0004385 Gy |
| 100 mR | 0.000877 Gy |
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.
Gray (Gy)
The gray (Gy) is the SI unit of absorbed dose: energy deposited per unit mass (1 Gy = 1 J/kg). Named after Louis Harold Gray. For gamma/X-rays and beta particles, 1 Gy ≈ 1 Sv (quality factor Q=1). Radiation therapy total dose: 40-80 Gy.
Frequently Asked Questions
How do I convert milliroentgens to grays?
To convert milliroentgens to grays, divide the value by 114025.08552. For example, 10 mR = 8.77e-5 Gy.
How many grays are in 1 milliroentgen?
1 milliroentgen equals 8.77e-6 grays.
What is the formula for milliroentgens to grays?
The formula is: Gy = mR ÷ 114025.08552.