Electric Charge Converter

Convert electric charge between coulombs, amp-hours, milliamp-hours, elementary charges and other units.

How to use the Electric Charge Converter

  1. Type the value you want to convert in the first box.
  2. Choose the unit you are converting from and the unit you want to convert to.
  3. Read the result instantly. Use the swap button to reverse the direction, or copy the result with one click.

Popular electric charge conversions

ConversionResultFormula
Milliampere-hours to ampere-hours1 mAh = 0.001 Ahampere-hours = milliampere-hours ÷ 1,000
Ampere-hours to milliampere-hours1 Ah = 1,000 mAhmilliampere-hours = ampere-hours × 1,000
Ampere-hours to coulombs1 Ah = 3,600 Ccoulombs = ampere-hours × 3,600
Coulombs to ampere-hours1 C = 0.000277778 Ahampere-hours = coulombs ÷ 3,600
Milliampere-hours to coulombs1 mAh = 3.6 Ccoulombs = milliampere-hours × 3.6
Coulombs to milliampere-hours1 C = 0.277778 mAhmilliampere-hours = coulombs ÷ 3.6

Supported electric charge units

UnitSymbolEqual to
CoulombC1 C
KilocoulombkC1,000 C
MillicoulombmC0.001 C
MicrocoulombµC0.000001 C
NanocoulombnC0.000000001 C
PicocoulombpC1 × 10-12 C
Ampere-hourAh3,600 C
Milliampere-hourmAh3.6 C
Elementary chargee1.6022 × 10-19 C
FaradayF96,485.332 C
AbcoulombabC10 C
StatcoulombstatC3.3356 × 10-10 C

Charge and battery capacity

The coulomb is the SI unit of electric charge: the charge carried by a current of one ampere in one second. One coulomb is about 6.242 × 1018 elementary charges.

Battery capacity is normally quoted in ampere-hours or milliampere-hours. One ampere-hour is the charge delivered by one ampere flowing for an hour, equal to 3,600 coulombs. A 5,000 mAh phone battery therefore stores 5 Ah, or 18,000 C.

To compare batteries with different voltages, convert to energy: watt-hours = ampere-hours × volts.

Frequently asked questions

How many coulombs are in 1 Ah?

One ampere-hour is exactly 3,600 coulombs.

How do I convert mAh to Ah?

Divide milliampere-hours by 1,000. For example, 2,500 mAh is 2.5 Ah.

What is the charge of one electron?

The elementary charge is 1.602176634 × 10⁻¹⁹ coulombs. An electron carries this charge with a negative sign.

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