Roentgen to Coulomb per kilogram Converter
1 roentgen is exactly 0.000258 coulombs per kilogram. Convert roentgens (R) to coulombs per kilogram (C/kg) below: type a value and the result updates as you type.
R to C/kg calculator
Result
Roentgen to Coulomb per kilogram conversion
1 R = 0.000258 C/kgone roentgen in coulombs per kilogram
1 C/kg ≈ 3875.968992 Rone coulomb per kilogram in roentgens
Roentgen (R): Older unit of exposure to X-rays and gamma rays in air: exactly 2.58 × 10⁻⁴ C/kg.
Coulomb per kilogram (C/kg): SI unit of exposure: electric charge produced by X-rays or gamma rays per kilogram of air.
Source:Roentgen: NIST Special Publication 811 (2008), Appendix B.8; Coulomb per kilogram: SI Brochure, 9th edition (BIPM, 2019)
How to convert roentgens to coulombs per kilogram
To convert roentgens to coulombs per kilogram, multiply the number of roentgens by 0.000258.
Formula
C/kg = R × 0.000258
Examples
- 5 R = 5 × 0.000258 = 0.00129 C/kg
- 25 R = 25 × 0.000258 = 0.00645 C/kg
- 100 R = 100 × 0.000258 = 0.0258 C/kg
Roentgen to Coulomb per kilogram conversion table
| Roentgen (R) | Coulomb per kilogram (C/kg) |
|---|---|
| 0.1 R | 0.0000258 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 |
| 5 R | 0.00129 C/kg |
| 10 R | 0.00258 C/kg |
| 20 R | 0.00516 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 |
| 1000 R | 0.258 C/kg |
Values rounded to 10 significant digits where needed.
Frequently asked questions
- How many coulombs per kilogram are in one roentgen?
- One roentgen is exactly 0.000258 coulombs per kilogram.
- How do I convert coulombs per kilogram to roentgens?
- To convert coulombs per kilogram to roentgens, divide the number of coulombs per kilogram by 0.000258. The formula is R = C/kg ÷ 0.000258.
- Is this conversion exact?
- Yes. Both units have exact definitions and the factor 0.000258 is exact. Displayed results are only rounded when they have many decimal places.
- Which is larger, a roentgen or a coulomb per kilogram?
- A coulomb per kilogram is about 3875.968992 times larger than a roentgen. In other words, a roentgen is 0.000258 of a coulomb per kilogram.