Use our lithium (LiFePO4) battery watt-hour calculator to convert the battery capacity from amp hours (Ah), or milliamp hours (mAh) to watt hours (Wh).
Lithium (LiFePO4) Battery Watt-Hour Calculator
Usable Watt Hours(WH)
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1 – Enter the battery capacity and select the unit type. The unit types are amp-hours (Ah), and milliamp-hours (mAh). For example, if you have a 100ah battery, enter 100 and select the unit type to Ah.
2 – Enter the battery voltage. Is this a 6v, 12v, 24v, or a 48v battery? It should be mentioned on the specs sheet of your battery or on the battery itself.
3 – Optional: Enter the number of batteries if you’re using multiple batteries. (Default value will be 1)
How Do You Calculate Lithium Battery Watt-Hours?
Multiply the battery capacity in amp-hours (Ah) by the battery voltage to calculate watt hours (Wh).
Formula: Battery capacity Watt-hours = Battery capacity Ah × Battery voltage
Example
Let’s say you have a 12v 200ah lithium battery.
12v 200Ah battery into watt hours = 200 × 12 = 2400WhLithium Battery Amp-Hours To Watt Hour Calculation
AdvertisementsHere’s a chart about different capacity (Ah) lithium batteries into watt hours @ 12v, 24, and 48v.
| Battery Ah | watt-hours @ 12v | watt-hours @ 24v | watt-hours @ 48v |
|---|---|---|---|
| 20Ah | 240 Wh | 480 Wh | 960 Wh |
| 50Ah | 600 Wh | 1200 Wh | 2400 Wh |
| 70Ah | 840 Wh | 1680 Wh | 3360 Wh |
| 100Ah | 1200 Wh | 2400 Wh | 4800 Wh |
| 120Ah | 1440 Wh | 2880 Wh | 5760 Wh |
| 150Ah | 1800 Wh | 3600 Wh | 7200 Wh |
| 200Ah | 2400 Wh | 4800 Wh | 9600 Wh |
| 300Ah | 3600 Wh | 7200 Wh | 14,400 Wh |
| 400Ah | 4800 Wh | 9600 Wh | 19,200 Wh |
Why Calculate Battery Watt-Hours?
Energy is equal to amp-hours multiplied by volts. Converting battery amp hours to watt-hours will give an idea of how much actual energy your battery can store or deliver.
For example, A 36v 12.8ah battery can store or deliver more energy than a 12v 30ah battery.
36v * 12.8ah = 460.8Wh12v * 30ah = 360WhThe benefit of converting battery amp hours to watt-hours:
- Makes it easy to calculate the battery runtime on a specific load. The energy or power consumption for most of the appliances is mentioned in watts or watt-hours. So, converting battery capacity in watt hours will make it easy for you to estimate the battery runtime on a load.
