Watt-hours to Amp-hours Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
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Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter the watt-hours and the voltage.
- Read the amp-hours.
How it works
Amp-hours = watt-hours ÷ voltage.
Worked example
500 Wh at 12 V. ≈ 41.7 Ah.
Common mistakes
- Using the wrong battery voltage (12 V vs 24 V vs 48 V).
- Forgetting usable capacity is less than rated (depth of discharge).
Frequently asked questions
How do I go back from Ah to Wh?
Multiply amp-hours by voltage: Wh = Ah × V.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.