Battery Life Calculator

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Estimates how long a battery will last based on its capacity and the device's power consumption.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Battery Capacity and Device Power Consumption in the units shown.

Step 2

Read Estimated Battery Life in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Battery Capacity: 4,000 mAh; Device Power Consumption: 250 mA

Estimated Battery Life: 16 hours

Battery Capacity: 8,000 mAh; Device Power Consumption: 500 mA

Estimated Battery Life: 16 hours

Battery Capacity: 50,000 mAh; Device Power Consumption: 1,000 mA

Estimated Battery Life: 50 hours

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