Battery Capacity Converter
Convert battery capacity between Ah, mAh, Wh and kWh at any voltage — the maths that matters when sizing batteries for solar, UPS and inverter systems. Enter one value and see every unit instantly.
Result will appear here.
How to use
- Enter your battery's capacity — e.g. 200 Ah — and its voltage, e.g. 12 V.
- Pick the unit you entered; all other units update live.
- Read the converted values in Ah, mAh, Wh and kWh below.
- Use the Wh figure to compare batteries of different voltages fairly.
Tips
- Wh is the fair way to compare batteries — Ah alone means nothing without voltage.
- Usable capacity depends on depth of discharge; lead-acid should not run fully flat.
- Check the voltage printed on your battery before converting.
- For solar and UPS sizing, size from the Wh you actually need per day.
Note: Wh = Ah x Voltage. Actual usable capacity depends on battery type and depth of discharge.