Charge Converter

Electric charge is a fundamental property of matter that causes it to experience a force in an electric field — it's the underlying quantity behind every electrical phenomenon, from the static cling of a balloon to the current flowing through a wire. Charge is measured in coulombs (C), where 1 coulomb corresponds to the charge carried by about 6.242 × 10¹⁸ electrons.

Our Charge converter supports the SI unit, coulomb, along with its metric multiples — kilocoulomb and megacoulomb for large charges, and millicoulomb, microcoulomb, nanocoulomb, and picocoulomb for the small charges typical of capacitors and electronic components. The CGS system contributes the abcoulomb (EMU of charge) and statcoulomb (also called the franklin, or ESU of charge) — two different CGS charge definitions that arise from different underlying unit systems and appear in older physics references. Practical current-time units — ampere-hour, ampere-minute, and ampere-second — round out the list, since charge is simply current integrated over time.

To use the converter, select your starting and target units from the dropdown lists and enter a value — the result is calculated instantly to up to 12 significant digits. For example, converting a typical AA battery's capacity of 2,000 milliampere-hours (2 A·h) to coulombs gives 7,200 C, a conversion useful when working through battery energy calculations in SI units.

Charge conversions are essential in battery and energy storage specification (capacity ratings in ampere-hours or milliampere-hours need to be converted to coulombs for physics-based calculations), capacitor design (the charge stored on a capacitor equals its capacitance multiplied by voltage), and electrochemistry, where Faraday's laws of electrolysis relate the total charge passed through a solution to the amount of substance deposited or liberated at an electrode — a calculation used in electroplating, metal refining, and battery chemistry research.

All conversion factors used in this tool are drawn from standard, internationally recognized unit definitions, so results are dependable for electronics design, battery specification work, and physics coursework. The converter is free, requires no account, and works equally well on desktop and mobile devices.