Battery runtime calculator

Usable watt-hours ÷ load, with efficiency losses.

NEED A DETAIL

Battery capacity is missing — enter Wh, or mAh with the voltage.

Battery runtime — inputs

Capacity (optional)

Or enter mAh plus voltage below.

Capacity (mAh) (optional)

mAh

Battery voltage (optional)

Needed to convert mAh to Wh. Phone/power-bank cells are usually rated at their nominal voltage — check the label.

Device power draw

Usable capacity

Assumption: Assumes the full rated capacity is usable; many systems reserve some.

Conversion efficiency

Assumption: Assumed inverter/converter loss — check your device’s spec.

Links and cards contain only the calculator inputs and result — never the question you typed.