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Battery: Convert Charge and Energy

Calculator for charge in ampere hours, energy in watt hours and voltage. The specifications of a battery often states only nominal charge (sometimes incorrectly referred to as capacity) and voltage. The more important value for the battery size is the energy, this is calculated as charge times voltage.

Nominal charge Q:
Voltage U:
Energy E:

Please choose the units, then enter two values, the third value will be calculated.

Formula: E = Q * U

Example: with a nominal charge of 20000 milliampere hours and a voltage of 5 volts, the battery has an energy of 100 watt hours when it is fully charged.

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German: Akku Rechner