What this tool does
Convert between electric charge units: coulombs, ampere-hours, milliampere-hours, and more. Type an amount in coulombs, choose the units, and the tool converts it to millicoulombs. It offers 11 electric charge units and also shows the same amount in the others.
Inputs
- Value: A number.
- From: Choose one from 11 options, including Coulomb, Millicoulomb, Microcoulomb, Nanocoulomb, Picocoulomb, Ampere-hour. Starts as Coulomb.
- To: Choose one of the same 11 units as "From". Starts as Millicoulomb.
How to use
- Enter the amount you want to convert.
- Choose the unit to convert from and the unit to convert to.
- 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 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.
- Q: What is an abcoulomb?
- A: An abcoulomb is the unit of electric charge in the CGS electromagnetic system. It equals exactly 10 coulombs.
- Q: How many elementary charges are in a coulomb?
- A: One coulomb is about 6.2415 × 10¹⁸ elementary charges. The elementary charge is exactly 1.602176634 × 10⁻¹⁹ C.
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