Online Tool Store
Charge Converter
Enter an electric charge value in coulombs, amp-hours, or milliamp-hours and see it converted to every other unit instantly. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Converted
Example shown — replace it with your own value and unit.
How it works
- Enter a charge value and its unit.
- The value converts to every other charge unit at once.
- Read off the result you need.
One amp-hour equals 3,600 coulombs (one amp of current for 3,600 seconds), and milliamp-hours are a thousandth of an amp-hour — this converter applies those fixed ratios to move between units.
FAQ
Is my data uploaded anywhere?
No. Conversion happens entirely in your browser — nothing is sent to a server.
What units are supported?
Coulomb, amp-hour, and milliamp-hour all convert to each other.
Why does battery capacity use amp-hours instead of coulombs?
Amp-hours are a more practical size for battery capacity — a typical phone battery is a few thousand mAh, versus tens of thousands of coulombs.
How is charge related to current?
Charge (coulombs) equals current (amps) multiplied by time (seconds) — an amp-hour is simply one amp of current sustained for one hour.
How we compare
| Feature | Online Tool Store | Calculator app | Physics textbook table |
|---|---|---|---|
| Shows every unit at once | ✓ | One conversion at a time | Requires manual lookup |
| Free, no setup | ✓ | ✓ | ✓ |
A textbook table needs manual lookup. Charge Converter gives an instant, exact result between coulombs, amp-hours, and milliamp-hours.