Current Converter

Electric current measures the rate of flow of electric charge past a point in a circuit — how many coulombs of charge pass by each second. It's one of the most fundamental quantities in electrical engineering, directly tied to voltage and resistance through Ohm's law, and it's the quantity that determines how much power a circuit consumes and how thick a wire needs to be to safely carry it.

Our Current converter supports the SI unit, ampere (A), along with kiloampere for large industrial currents and milliampere for the small currents typical of electronic circuits. The biot (Bi) and abampere (abA) are CGS electromagnetic units, both equal to exactly 10 amperes — the biot is named after physicist Jean-Baptiste Biot, while "abampere" reflects its origin in the "absolute" electromagnetic (EMU) unit system. The statampere (stA), a CGS electrostatic (ESU) unit, is a much smaller unit still occasionally referenced in older physics literature, along with its EMU and ESU equivalents.

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 USB charging current of 2 amperes to milliamperes gives 2,000 mA, the unit most commonly seen on phone and device charging specifications.

Current conversions are essential throughout electrical and electronics work: Ohm's law (V = I × R) requires current in consistent units to relate voltage and resistance; wire and fuse sizing depends on the current-carrying capacity required for a given circuit; and battery, power supply, and charger specifications are rated by their maximum output current, almost always in amperes or milliamperes. Understanding the older CGS current units also matters for reading historical physics papers and some international standards that still reference them.

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