Convert Roentgen to Milliroentgen
Input the number of roentgens you want to convert to milliroentgens.
How to Convert Roentgens to Milliroentgens
The roentgen and milliroentgen are both units of radiation dose. By definition, 1 roentgen equals exactly 1000 milliroentgens. This means to convert roentgens to milliroentgens, you multiply by 1000.
Formula
Step-by-Step Example
Convert 5 R to milliroentgens:
We need to convert roentgens to milliroentgens
Since 1 R = 1000 mR, multiply by 1000
5 × 1000 = 5000
5 R = 5000 mR
Roentgen to Milliroentgen Conversion Table
Quick reference table for common roentgen to milliroentgen conversions. Click any value for detailed calculation.
| Roentgens (R) | Milliroentgens (mR) |
|---|---|
| 0.1 R | 100 mR |
| 0.5 R | 500 mR |
| 1 R | 1000 mR |
| 2 R | 2000 mR |
| 5 R | 5000 mR |
| 10 R | 10000 mR |
| 25 R | 25000 mR |
| 50 R | 50000 mR |
| 100 R | 100000 mR |
About These Units
Roentgen (R)
The roentgen (R) measures ionization produced by X-rays or gamma rays in air. One roentgen produces 2.58×10⁻⁴ C/kg of ionization. Approximately: 1 R ≈ 8.77 mGy or 0.877 rad in soft tissue. Named after Wilhelm Röntgen, discoverer of X-rays.
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.
Frequently Asked Questions
How do I convert roentgens to milliroentgens?
To convert roentgens to milliroentgens, multiply the value by 1000. For example, 10 R = 10000 mR.
How many milliroentgens are in 1 roentgen?
1 roentgen equals 1000 milliroentgens.
What is the formula for roentgens to milliroentgens?
The formula is: mR = R × 1000.