Roentgen to coulombs per kilogram
Type a value in R to get it in C/kg instantly.
0.0258C/kg
That's 33× as much exposure as a minute of fluoroscopy, while a lethal whole-body exposure is 4.5× more.
Convert the other way: C/kg to R
What it means
How much exposure is that?
Information only. Medical figures are typical entrance exposures and vary widely with equipment and patient. For dose to people, use gray and sievert.
The math
How to convert R to C/kg
To convert roentgen to coulombs per kilogram, multiply by 0.000258.
Example: 100 R × 0.000258 = 0.0258 C/kg.
In the other direction, 1 C/kg = 3,875.97 R.
Every unit
Your exposure in every unit
Tables
R to C/kg conversion table
| R | C/kg |
|---|---|
| 1 R | 0.000258 C/kg |
| 5 R | 0.00129 C/kg |
| 10 R | 0.00258 C/kg |
| 15 R | 0.00387 C/kg |
| 25 R | 0.00645 C/kg |
| 50 R | 0.0129 C/kg |
| 100 R | 0.0258 C/kg |
| 250 R | 0.0645 C/kg |
| 500 R | 0.129 C/kg |
| 1,000 R | 0.258 C/kg |
| 5,000 R | 1.29 C/kg |
C/kg to R conversion table
| C/kg | R |
|---|---|
| 1 C/kg | 3,875.97 R |
| 5 C/kg | 19,379.8 R |
| 10 C/kg | 38,759.7 R |
| 15 C/kg | 58,139.5 R |
| 25 C/kg | 96,899.2 R |
| 50 C/kg | 193,798 R |
| 100 C/kg | 387,597 R |
| 250 C/kg | 968,992 R |
| 500 C/kg | 1,937,980 R |
| 1,000 C/kg | 3,875,970 R |
| 5,000 C/kg | 19,379,800 R |
Quick answers
Quick answers
- How many C/kg is 1 R?
- 1 R is 0.000258 C/kg.
- How many C/kg is 10 R?
- 10 R is 0.00258 C/kg.
- How many C/kg is 100 R?
- 100 R is 0.0258 C/kg.
The units
About these units
Roentgen (R)
The classic unit of exposure, 2.58 × 10⁻⁴ C/kg.
Coulombs per kilogram (C/kg)
The SI unit of exposure.
Keep going