Use our battery life calculator to estimate how long your device can work on a single charge. Enter your battery capacity and average power consumption to calculate expected runtime for laptops, smartphones, tablets and other devices.

How is battery life calculated?

Battery life is estimated by dividing battery capacity (Wh) by average power consumption (W).

Why is real battery life different from the calculator result?

Actual battery performance depends on screen brightness, processor load, applications, wireless connections and battery condition.

How many hours should a laptop battery last?

Modern laptops usually provide between 5 and 15 hours of battery life depending on hardware, battery size and usage scenario.