Roentgens to Coulomb/kilograms (R to C/kg)
Free online roentgen to coulomb/kilogram converter. Type a value, get an instant exact result — plus the formula, a ready-made conversion table, and reverse conversion.
RADIATION EXPOSURE CONVERTER — INSTANT RESULT
Formula: multiply the roentgen value by 0.000258 — i.e. C/kg = R × 0.000258
Quick check: 1 R = 0.000258 C/kg
Quick check: 1 R = 0.000258 C/kg
Roentgens to Coulomb/kilograms conversion table
| Roentgens (R) | Coulomb/kilograms (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 |
| 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 |
How to convert roentgens to coulomb/kilograms
To convert roentgens to coulomb/kilograms, multiply the amount in roentgens by 0.000258. For example, 10 R = 0.00258 C/kg. To convert in the other direction, divide by the same factor, or use the ⇄ swap button above.
Convert ionizing radiation exposure between coulombs per kilogram and roentgens. One roentgen is exactly 2.58×10⁻⁴ C/kg.
Frequently asked questions
How many coulomb/kilograms are in one roentgen?
One roentgen is exactly 0.000258 coulomb/kilograms.
How do I convert R to C/kg?
Multiply the R value by 0.000258 to get C/kg. The converter at the top of this page does this automatically and works in both directions.
How much is 100 roentgens in coulomb/kilograms?
100 roentgens equals 0.0258 coulomb/kilograms.