Electric Charge Converter
Convert C, mC, µC, Ah and mAh. Battery capacity in mAh measures charge; Wh measures energy.
- InstantResults update as you type
- 27 categoriesFrom length to data storage
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How to use this tool
Steps for using the Unit Converter.
- Type a number into From — milliampere-hours are preselected. Commas and scientific notation such as 2.5e3 are accepted.
- Pick the units to convert between; the result in coulombs (or whichever unit you choose) updates as you type. Use the swap button to reverse the conversion.
- Set the decimal places, turn on Show formula to see the calculation, and copy or share the result.
- Below the converter, the table lists every electric charge unit with its exact definition, and the links open dedicated pages for the most common pairs.
Example
3,000 milliampere-hours to coulombs
3,000 mAh10,800 C
Formula: C = mAh × 3.6Common use cases
- Battery and power-bank capacities.
- Electrochemistry and electroplating.
- Electrostatics problems.
Electric Charge unit table
| Unit | Symbol | System | Definition | In coulombs |
|---|---|---|---|---|
| Microcoulomb | µC | Metric | 10⁻⁶ C | 0.000001 |
| Millicoulomb | mC | Metric | 1/1000 C | 0.001 |
| Coulomb | C | SI | 1 A·s, the SI unit of charge | 1 |
| Milliampere-hour | mAh | Other | 1 mA for 1 hour = 3.6 C | 3.6 |
| Ampere-hour | Ah | Other | 1 A for 1 hour = 3,600 C | 3,600 |
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About electric charge units
The coulomb is the SI unit of electric charge: the charge moved by a current of one ampere in one second. An ampere-hour is one amp for an hour, 3,600 C, and a milliampere-hour is 3.6 C.
Battery capacity in mAh is a charge, not an energy. To compare batteries with different voltages, use energy: Wh = Ah × V. A 3,000 mAh phone battery at 3.85 V stores about 11.6 Wh, while a 3,000 mAh pack at 12 V stores 36 Wh.
Limitations
- Results are rounded for display only; the calculation keeps full precision (15 significant digits).
Frequently asked questions
How many coulombs is 1 mAh?
3.6 C (0.001 A × 3,600 s).
Can I convert mAh to Wh here?
Not directly — it needs the battery voltage. Multiply Ah by volts: 5 Ah × 3.7 V = 18.5 Wh.
How many mAh are in an Ah?
1,000 mAh.
Are these electric charge conversions exact?
Each unit is defined from its official definition (for example 1 inch = 2.54 cm exactly). Results are calculated in double precision and only rounded to the decimal places you choose when shown.