Convert Roentgen to Rem
Input the number of roentgens you want to convert to rem.
How to Convert Roentgens to Rem
The roentgen and rem are both units of radiation dose. 1 rem equals 1.1402508552 roentgens. This means to convert roentgens to rem, you divide by 1.1402508552.
Formula
Step-by-Step Example
Convert 5 R to rem:
We need to convert roentgens to rem
Since 1 rem = 1.1402508552 R, divide by 1.1402508552
5 ÷ 1.1402508552 = 4.385
5 R = 4.385 rem
Roentgen to Rem Conversion Table
Quick reference table for common roentgen to rem conversions. Click any value for detailed calculation.
| Roentgens (R) | Rem (rem) |
|---|---|
| 1 R | 0.877 rem |
| 2 R | 1.754 rem |
| 5 R | 4.385 rem |
| 10 R | 8.77 rem |
| 15 R | 13.155 rem |
| 20 R | 17.54 rem |
| 25 R | 21.925 rem |
| 50 R | 43.85 rem |
| 100 R | 87.7 rem |
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.
Rem (rem)
The rem (Roentgen Equivalent Man) is the traditional unit of equivalent dose. One sievert = 100 rem exactly. Still used in US nuclear industry and regulations. Annual occupational limit: 5 rem/year. Natural background: 0.3 rem/year. Acute 450 rem ≈ LD50.
Frequently Asked Questions
How do I convert roentgens to rem?
To convert roentgens to rem, divide the value by 1.1402508552. For example, 10 R = 8.77 rem.
How many rem are in 1 roentgen?
1 roentgen equals 0.877 rem.
What is the formula for roentgens to rem?
The formula is: rem = R ÷ 1.1402508552.