Device Charging Time Calculator

Free tool

Enter the battery capacity, charger power, and current battery percentage to find out the real charging time, accounting for energy lost as heat.

Battery and charger details

Battery capacity

Unit

Nominal voltage (V)

Charger power (W)

Current battery (%)

Charging efficiency (%)

Some energy is lost as heat during charging; 85% is a realistic typical value, not 100%.

Fill in the battery and charger details to see the estimated charging time.