Battery Capacity Calculator

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Calculates battery capacity (e.g., in mAh or Wh) based on voltage and charge/discharge characteristics.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Voltage (V), Current (mA), and Discharge time (hours) in the units shown.

Step 2

Read Capacity (Wh) and Capacity (mAh) 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.

Voltage (V): 3.7 V; Current (mA): 1,500 mA; Discharge time (hours): 1.5 h

Capacity (Wh): 8.325 Wh; Capacity (mAh): 2,250 mAh

Voltage (V): 1.5 V; Current (mA): 2,700 mA; Discharge time (hours): 0.5 h

Capacity (Wh): 2.025 Wh; Capacity (mAh): 1,350 mAh

Voltage (V): 14.8 V; Current (mA): 3,000 mA; Discharge time (hours): 2 h

Capacity (Wh): 88.8 Wh; Capacity (mAh): 6,000 mAh

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