Other Calculators

Battery Life Calculator

Estimate how many hours a battery will last given its capacity and your device's current draw.

Estimated battery life —

About the Battery Life Calculator

A battery's runtime depends on how much energy it stores versus how quickly your device consumes it. Capacity is measured in milliamp-hours (mAh) and current draw in milliamps (mA).

Formula: Battery Life (hours) = Battery Capacity (mAh) ÷ Current Draw (mA)

This is a simplified estimate that assumes a constant current draw; real-world usage (screen brightness, network activity, background apps) causes draw to vary, so actual battery life is often somewhat lower than this theoretical maximum.