Electric Charge Converter

This charge converter changes mAh to coulombs, Ah to mAh, and coulombs to elementary charges. Use it to compare battery capacities or check physics homework.

Updated
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Result
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How to use the Electric Charge Converter

  1. Type the Value you want to convert.
  2. Pick the unit it is in under From, and the unit you want under To. The swap button flips them.
  3. The answer updates as you type. The table below it shows the same value in every other unit, each with its own copy button.

How it works

1 Ah = 1 A × 3,600 s = 3,600 C
1 mAh = 3.6 C
1 e = 1.602176634 × 10^-19 C (exact since 2019)
result = value × from-unit (C) ÷ to-unit (C)

Examples

  • 1 Ah = 3,600 C.
  • 3,000 mAh = 10,800 C = 3 Ah.
  • 1 C = 6.241509 × 10^18 e.
  • 20,000 mAh = 20 Ah (a large power bank).

Milliampere-hour to coulomb conversion table

Milliampere-hour (mAh)Coulomb (C)
500 mAh1,800 C
1,000 mAh3,600 C
2,000 mAh7,200 C
3,000 mAh10,800 C
4,000 mAh14,400 C
5,000 mAh18,000 C
10,000 mAh36,000 C
20,000 mAh72,000 C
26,800 mAh96,480 C
50,000 mAh180,000 C

mAh is charge, not energy

A battery's mAh rating tells you how much charge it holds, not how much energy. To get energy, multiply by the voltage: a 3,000 mAh phone battery at 3.85 V stores about 11.6 Wh. Two batteries with the same mAh but different voltages hold different amounts of energy, which is why airlines set their limits in watt-hours.

Limitations

  • Converts charge only. To get energy in Wh, multiply Ah by the battery voltage.

Frequently asked questions

How many coulombs are in a mAh?

3.6 coulombs. A milliampere flowing for one hour is 0.001 A × 3,600 s.

How do I convert mAh to Ah?

Divide by 1,000. For example, 5,000 mAh is 5 Ah.

How do I turn mAh into watt-hours?

Multiply mAh by the voltage and divide by 1,000. 10,000 mAh at 3.7 V is 37 Wh.

Often used together with the Electric Charge Converter.