How to convert roentgens to coulombs per kilogram
C/kg = R × 0.000258Multiply the value in roentgens by 0.000258. To go the other way, multiply by 3,875.968992 (or divide by 0.000258).
A roentgen is smaller than a coulomb per kilogram: it takes 3,875.968992 roentgens to make one coulomb per kilogram.
Worked examples
- 1 roentgen1 R × 0.000258 = 0.000258 C/kg
- 5 roentgens5 R × 0.000258 = 0.00129 C/kg
- 10 roentgens10 R × 0.000258 = 0.00258 C/kg
- 20 roentgens20 R × 0.000258 = 0.00516 C/kg
- 100 roentgens100 R × 0.000258 = 0.0258 C/kg
Roentgens to coulombs per kilogram conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Roentgens (R) | Coulombs per kilogram (C/kg) |
|---|---|
| 0.1 R | 0.0000258 C/kg |
| 0.25 R | 0.0000645 C/kg |
| 0.5 R | 0.000129 C/kg |
| 1 R | 0.000258 C/kg |
| 2 R | 0.000516 C/kg |
| 3 R | 0.000774 C/kg |
| 4 R | 0.001032 C/kg |
| 5 R | 0.00129 C/kg |
| 6 R | 0.001548 C/kg |
| 7 R | 0.001806 C/kg |
| 8 R | 0.002064 C/kg |
| 9 R | 0.002322 C/kg |
| 10 R | 0.00258 C/kg |
| Roentgens (R) | Coulombs per kilogram (C/kg) |
|---|---|
| 12 R | 0.003096 C/kg |
| 15 R | 0.00387 C/kg |
| 20 R | 0.00516 C/kg |
| 25 R | 0.00645 C/kg |
| 30 R | 0.00774 C/kg |
| 40 R | 0.01032 C/kg |
| 50 R | 0.0129 C/kg |
| 75 R | 0.01935 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 |
About the units
Roentgen (R)
The roentgen (R) is a unit of radiation exposure. One roentgen equals 0.000258 coulombs per kilogram (C/kg).
Coulomb per kilogram (C/kg)
The coulomb per kilogram (C/kg) is a unit of radiation exposure in the International System of Units (SI).
Frequently asked questions
How many coulombs per kilogram are in one roentgen?
There are 0.000258 coulombs per kilogram in one roentgen, and this value is exact by definition.
How do I convert roentgens to coulombs per kilogram?
Multiply the number of roentgens by 0.000258. For example, 10 R × 0.000258 = 0.00258 C/kg.
How many roentgens are in one coulomb per kilogram?
One coulomb per kilogram equals 3,875.968992 roentgens. That is the reverse factor, 1 ÷ 0.000258.
What is 10 roentgens in coulombs per kilogram?
10 R = 0.00258 C/kg.
Is this R to C/kg converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.