Electric Charge Converter — Coulombs, Ah & mAh

Convert between coulombs, ampere-hours, milliamp-hours, and faradays.

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How this conversion works. Every unit is converted through the coulomb (1 A·s) using exact time factors and constants from NIST Special Publication 811.

How to use

  1. Choose the units to convert from and to.
  2. Enter a value — the converted result updates instantly.
  3. Click Copy to copy the result to your clipboard.

Frequently asked questions

How do I convert milliampere-hour to coulomb?

1 milliampere-hour = 3.6 coulomb. Choose "Milliampere-hour (mAh)" as From and "Coulomb (C)" as To, type a value, and the result updates instantly.

How many coulombs are in a 3000 mAh battery?

3,000 mAh × 3.6 = 10,800 C. Each mAh is exactly 3.6 coulombs (0.001 A × 3600 s).

Is mAh a measure of energy?

No — it is charge. Energy = charge × voltage: a 3,000 mAh cell at 3.7 V holds 11.1 Wh. Comparing batteries by mAh only works at the same voltage.

Is my data sent to a server?

No. Conversions run entirely in your browser using fixed factors — nothing is uploaded or logged.

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