Charge Converter
Convert between coulombs, ampere-hours and milliampere-hours in one click.
The Charge Converter is a free online tool that converts electric charge between coulombs (C), ampere-hours (Ah) and milliampere-hours (mAh) instantly. No sign-up required — just enter a value and get an accurate result. It's especially useful when comparing battery specs across brands or working through basic electrical engineering problems.
What is electric charge?
Electric charge measures the amount of electricity that flows through a circuit over time. Coulombs are the SI base unit, while ampere-hours and milliampere-hours are the everyday units used to rate batteries — from phone batteries measured in mAh to car batteries measured in Ah. Converting between them helps you compare battery capacity or work through electrical formulas. This distinction matters because most consumer product listings use mAh or Ah, while textbooks and formulas typically rely on coulombs.
How to use the Charge Converter
- Enter the charge value you want to convert.
- Select the unit to convert from — coulombs, Ah, or mAh.
- Click Calculate to see the equivalent in the other units.
Key features
- Covers coulombs, ampere-hours and milliampere-hours.
- Handy for comparing battery capacities across devices.
- Instant, accurate, two-way conversion.
- Free and works directly in your browser.
Related tools
Also working with electrical values? Try the Current Converter, Voltage Converter, or Energy Converter.
Frequently asked questions
Is the Charge Converter free?
Yes, it's completely free with no sign-up or limits. Feel free to convert as many values as you need for coursework or product research.
How do I convert mAh to Ah?
Divide the mAh value by 1,000. For example, 3,000 mAh equals 3 Ah. This simple decimal shift makes it easy to compare small and large battery capacities side by side.
How does ampere-hours relate to coulombs?
One ampere-hour equals 3,600 coulombs, since one amp flowing for one hour (3,600 seconds) transfers 3,600 coulombs of charge. Understanding this relationship helps when converting between textbook physics units and everyday battery ratings.
Why are batteries rated in mAh?
Milliampere-hours indicate how much current a battery can supply over time, giving a practical measure of battery capacity for small electronics. A higher mAh rating generally means the battery can power a device for longer between charges, assuming similar power draw.
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