Coulombs to Ampere-hours Converter
1 coulomb ≈ 0.000277777778 ampere-hours
1 coulomb equals 0.000277778 ampere-hours
How to convert coulombs to ampere-hours
Charge is current integrated over time: 1 Ah = 3600 C. Battery mAh is a charge rating; converting it to Wh additionally requires voltage and is not a charge-unit conversion.
Ah = C ÷ 3600One ampere-hour corresponds to 3600 coulombs, so divide by that figure. Displayed constants may be rounded; the converter uses the stored factor before rounding the result.
0.00277778 Ah ≈ 10 ÷ 3600Coulombs to ampere-hours conversion table
Common values in coulombs, converted to ampere-hours.
| Coulombs (C) | Ampere-hours (Ah) |
|---|---|
| 1 | 0.00027777778 |
| 2 | 0.00055555556 |
| 3 | 0.00083333333 |
| 4 | 0.0011111111 |
| 5 | 0.0013888889 |
| 10 | 0.0027777778 |
| 20 | 0.0055555556 |
| 25 | 0.0069444444 |
| 50 | 0.013888889 |
| 100 | 0.027777778 |
| 250 | 0.069444444 |
| 500 | 0.13888889 |
| 1,000 | 0.27777778 |
About these units
coulombC
The SI derived unit of electric charge: one ampere-second.
ampere-hourAh
The charge delivered by one ampere for one hour: exactly 3,600 coulombs.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.