Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Charge (Ah)

Required number input.

Convert battery charge in amp-hours to coulombs. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Charge (C)

The resulting charge returned as a number.

• Battery capacity, state of charge, runtime, and aging depend on chemistry, temperature, discharge profile, cutoff voltage, cell balance, charge method, rate capability, self-discharge, and prior history. Nominal amp-hour or watt-hour ratings do not guarantee usable energy under every load.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• Ah From Coulombs

  Convert charge in coulombs to battery capacity in amp-hours.

• Capacity From Energy

  Convert stored energy in watt-hours to amp-hour capacity at a nominal pack voltage.

• Battery Stored Energy Calculator

  Convert a battery charge rating into stored energy, Wh = V * Ah, so packs of different voltages can be compared on equal footing.