Amp-Hours (Ah) to Watt-Hours (Wh) Conversion Calculator: What It Measures
Convert battery capacity from amp-hours to watt-hours using the battery voltage. This calculator uses the displayed units and keeps the calculation transparent so you can check the result against a nameplate, battery specification, or electrical design estimate. It is useful for sizing equipment, comparing energy ratings, and translating between common electrical quantities.
How to Calculate Amp-Hours (Ah) to Watt-Hours (Wh) Conversion Calculator
Step One: Multiply amp-hours by voltage
Start with the first relationship in the calculation.
watt-hours = amp-hours × voltage
Using the calculator’s default values:
100 Ah × 12 V = 1,200 Wh
Step Two: Report the result in watt-hours
Apply the unit conversion or electrical factor needed for the final result.
energy = amp-hours × voltage
Using the same example:
1,200 Wh
Important Assumptions
Use the correct nominal voltage, phase arrangement, power factor, resistance, time period, and efficiency for the equipment being evaluated. The result is an estimate for planning and education, not a substitute for manufacturer data, local electrical code, or a qualified electrician.