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Coulomb Converters

Convert electric charge between coulombs and related units.

What this tool does

Convert electric charge between coulombs and related units. Type an amount in coulombs, choose the units, and the tool converts it to millicoulombs. It offers 13 electric charge units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one from 13 options, including Coulomb, Millicoulomb, Microcoulomb, Nanocoulomb, Picocoulomb, Ampere-hour. Starts as Coulomb.
  • To: Choose one of the same 13 units as "From". Starts as Millicoulomb.

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Conversions from coulombs to millicoulombs:

  • 1 C = 1,000 mC
  • 5 C = 5,000 mC
  • 10 C = 10,000 mC
  • 50 C = 50,000 mC
  • 100 C = 100,000 mC

Multiply the number of coulombs by 1,000 to get millicoulombs. Both units are exact definitions, so 1,000 is the exact factor: 1 C = 1,000 mC.

Sources: Coulomb: SI Brochure, 9th edition (2019). Millicoulomb: SI Brochure, 9th edition (2019, updated 2022), Table 7 (SI prefixes).

Limitations

  • Converts units of electric charge only. It does not turn charge into energy, because that also needs a voltage.
  • Abcoulomb and statcoulomb are historical CGS units, listed for completeness.

FAQs

Q: How many ampere-seconds is one coulomb?
A: One coulomb is exactly one ampere-second, since 1 C = 1 A x 1 s.
Q: How many coulombs is one faraday?
A: One faraday is the charge of one mole of electrons, about 96,485 coulombs.
Q: How many coulombs are in a milliampere-hour?
A: One milliampere-hour is 3.6 coulombs, because 0.001 A flowing for 3600 s moves 3.6 C. One ampere-hour is 3600 coulombs.

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