Battery Capacity Calculator
Calculate battery capacity in Ah, mAh and Wh from current, runtime and voltage.
Calculator
Enter the values below. Every quantity identifies its unit or meaning.
Result
Calculated from your inputs.
How to use this calculator
What to enter
Enter or select the following as requested: Current draw; Required runtime; Battery voltage. Follow the units, valid ranges, examples, and options displayed beside each field.
What the result means
The electrical or energy result is based on the ratings, load, duration, voltage, efficiency, and other values requested by the form. Confirm units and design assumptions; real performance depends on losses, environmental conditions, and equipment specifications.
When to use it
Use this for preliminary energy estimates or equipment planning. For electrical installation, safety, or code compliance, verify the result against manufacturer data and applicable professional standards.