Coulombs to Milliampere-hours Converter
1 coulomb ≈ 0.277777778 milliampere-hours
Charge, not energy. Converting mAh to watt-hours needs the battery voltage as well, so it is not a unit conversion.
1 coulomb equals 0.277778 milliampere-hours
How to convert coulombs to milliampere-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.
mAh = C ÷ (18/5)One milliampere-hour corresponds to 18/5 coulombs, so divide by that figure. Displayed constants may be rounded; the converter uses the stored factor before rounding the result.
2.77778 mAh ≈ 10 ÷ (18/5)Charge, not energy. Converting mAh to watt-hours needs the battery voltage as well, so it is not a unit conversion.
Coulombs to milliampere-hours conversion table
Common values in coulombs, converted to milliampere-hours.
| Coulombs (C) | Milliampere-hours (mAh) |
|---|---|
| 1 | 0.27777778 |
| 2 | 0.55555556 |
| 3 | 0.83333333 |
| 4 | 1.1111111 |
| 5 | 1.3888889 |
| 10 | 2.7777778 |
| 20 | 5.5555556 |
| 25 | 6.9444444 |
| 50 | 13.888889 |
| 100 | 27.777778 |
| 250 | 69.444444 |
| 500 | 138.88889 |
| 1,000 | 277.77778 |
About these units
coulombC
The SI derived unit of electric charge: one ampere-second.
milliampere-hourmAh
The battery capacity unit printed on phone and laptop cells.
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.