Electric Charge Converter

Convert electric charge values among common SI, metric and customary units. Electric charge is current integrated over time. One ampere hour equals 3,600 coulombs because an ampere is one coulomb per second.

ValueSigned values are supported; scientific notation is accepted.Convert fromCoulomb (C)Millicoulomb (mC)Microcoulomb (µC)Nanocoulomb (nC)Ampere hour (Ah)Milliampere hour (mAh)Convert toCoulomb (C)Millicoulomb (mC)Microcoulomb (µC)Nanocoulomb (nC)Ampere hour (Ah)Milliampere hour (mAh)

Convert

Converted value3600 C

SI-base value3600 C

Multiply by3600

The displayed results apply to the default example. Enable JavaScript to convert other values.

How to use this converter

1. Enter the electric charge value.
2. Select its current unit and the unit you want.
3. Select Convert. The page shows the converted value, the SI-base value and the direct multiplication factor.

Conversion formula

Converted value = entered value × source-to-SI factor ÷ target-to-SI factor.

Every option is represented by its factor to coulomb (C). This one-base method keeps reciprocal conversions consistent. Calculations run in your browser, and old results are hidden when an input changes or validation fails.

Worked example

Convert 1 Ah to C. Multiply by 3600; the result is 3600 C. The same input equals 3600 C in the SI-base unit.

Accuracy and limitations

Battery amp-hour ratings depend on discharge rate, temperature, age and cutoff voltage. Converting the unit does not predict usable energy.

The calculator retains more digits internally than it displays. Round the final value to the precision supported by your measurement. Very large and very small answers may use scientific notation.

Frequently asked questions

Why is an ampere hour equal to 3,600 coulombs?

One hour has 3,600 seconds, so one ampere flowing for an hour transfers 3,600 coulombs.

Can I reverse the conversion?

Yes. Swap the From and To selections. Because both units use the same SI base, the reverse factor is the reciprocal of the forward factor.

Why was my entry rejected?

Use digits with an optional decimal point or scientific notation. Blank values, commas, fractions, words and non-finite entries are rejected. Negative values are allowed when they express direction or polarity.

Review notes and sources

Reviewed October 4, 2026. The conversion factors, default example, zero or signed boundary behavior, invalid-input handling and recovery after an error were checked. Factors follow SI definitions and published conversion guidance from the NIST Guide to the SI and the BIPM SI Brochure. Explanations and examples are original.

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