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Electric charge is measured in Coulombs in the formal SI system, but battery capacities are almost always labeled in milliampere-hours (mAh) or ampere-hours (Ah) instead — a related but differently-scaled unit.
This calculator converts between Coulombs, milliampere-hours, ampere-hours, and microcoulombs.
How it works
Enter a value and select the unit you're converting from and to. The tool converts your value to Coulombs (the base SI unit) as an intermediate step, then to your target unit.
- Enter value.
- Enter from.
- Enter to.
- Click Calculate to see your results.
Examples
A 2,000 mAh phone battery
A 2,000 mAh battery capacity converts to 7,200 Coulombs.
Who should use it
- Comparing battery capacities specified in different units.
- Converting a battery's charge rating for use in an electronics or engineering calculation.
Industry applications
- Electronics and battery engineering
- Consumer electronics specifications
Advantages
- Covers the battery-industry-standard mAh/Ah units alongside the formal SI Coulomb.
- Simple, exact conversions.
Limitations
- Doesn't calculate battery life or runtime directly — only converts between charge units.
Common mistakes to avoid
- Confusing mAh (a charge/capacity unit) with mA (a current unit) — they're related but not interchangeable without a time factor.
Best practices
- When comparing battery capacities, make sure you're comparing the same unit (mAh vs. Ah) — a mismatch can make capacities look very different when they aren't.
Tips
- 1 Ah always equals 1,000 mAh — a quick mental check when comparing battery specs listed in different units.