Energy & Environment
Battery Capacity Calculator
Find battery capacity from voltage and amp hours.
Formula
Capacity = voltage × amp hours.
How it works
For example, 12 V × 100 Ah = 1200 Wh.
FAQs
What does the Battery Capacity Calculator do?
It takes the values you enter and works out the battery capacity calculator for you, showing the result straight away.
What should I enter?
Enter ordinary numbers in the boxes above. If a value does not make sense for this calculation, the page will ask you to check it instead of showing a wrong answer.
Can I use the result for everyday math?
Yes. It is a general-purpose math helper; for professional work, still check the steps against your own working.
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All tools are free.
Each page shows the formula it uses, so you can check the result yourself.
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