mAh to Wh Battery Capacity Calculator
Enter one cell's capacity in mAh, Ah or Wh with its nominal voltage, then set how many cells are in series and in parallel to get the pack totals.
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Formula
Wh = Ah × VandAh = mAh ÷ 1000- Pack voltage:
V_pack = V_cell × series count - Pack capacity:
Ah_pack = Ah_cell × parallel count - Pack energy:
Wh_pack = V_pack × Ah_pack
Worked example
A 3000 mAh, 3.7 V cell is 3 Ah × 3.7 V = 11.1 Wh. Wired as 4 in series and 2 in parallel (4S2P) the pack is 4 × 3.7 = 14.8 V, 2 × 3000 = 6000 mAh and 14.8 × 6 = 88.8 Wh.
Frequently asked questions
How do I convert mAh to Wh?
Divide mAh by 1000 to get Ah, then multiply by the voltage. A 3000 mAh cell at 3.7 V is 3 x 3.7 = 11.1 Wh.
How do I convert Wh to mAh?
Divide Wh by the voltage to get Ah, then multiply by 1000. 11.1 Wh at 3.7 V is 3 Ah, which is 3000 mAh. Without the voltage the conversion is not possible.
How do series and parallel cells combine?
Cells in series add voltage and keep the capacity; strings in parallel add capacity and keep the voltage. A 4S2P pack of 3000 mAh, 3.7 V cells is 14.8 V, 6000 mAh and 88.8 Wh.
Is the nominal voltage the real voltage?
No. Voltage falls as a cell discharges, so Wh from the nominal voltage is an estimate. Check the datasheet. Results are for learning and design checks, not safety certification.