Convert Roentgen to Rad
Input the number of roentgens you want to convert to rads.
How to Convert Roentgens to Rads
The roentgen and rad are both units of radiation dose. 1 rad equals 1.1402508552 roentgens. This means to convert roentgens to rads, you divide by 1.1402508552.
Formula
Step-by-Step Example
Convert 5 R to rads:
We need to convert roentgens to rads
Since 1 rad = 1.1402508552 R, divide by 1.1402508552
5 ÷ 1.1402508552 = 4.385
5 R = 4.385 rad
Roentgen to Rad Conversion Table
Quick reference table for common roentgen to rad conversions. Click any value for detailed calculation.
| Roentgens (R) | Rads (rad) |
|---|---|
| 1 R | 0.877 rad |
| 2 R | 1.754 rad |
| 5 R | 4.385 rad |
| 10 R | 8.77 rad |
| 15 R | 13.155 rad |
| 20 R | 17.54 rad |
| 25 R | 21.925 rad |
| 50 R | 43.85 rad |
| 100 R | 87.7 rad |
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.
Rad (rad)
The rad (Radiation Absorbed Dose) is the traditional unit of absorbed dose. One gray = 100 rads exactly. One rad = 100 ergs/gram = 0.01 J/kg. Still used in US medical and nuclear industries. One rad = one centigray = one rem for gamma/X-rays.
Frequently Asked Questions
How do I convert roentgens to rads?
To convert roentgens to rads, divide the value by 1.1402508552. For example, 10 R = 8.77 rad.
How many rads are in 1 roentgen?
1 roentgen equals 0.877 rads.
What is the formula for roentgens to rads?
The formula is: rad = R ÷ 1.1402508552.