mAh to Wh converter
Watt-hours = milliamp-hours × volts ÷ 1,000. Type in any box and the others update: mAh, Wh, Ah and mWh, at the voltage you choose.
The formulas
- Wh = mAh × V ÷ 1,000
- mAh = Wh × 1,000 ÷ V
- Ah = mAh ÷ 1,000, and Wh = Ah × V
- mWh = Wh × 1,000, so mAh = mWh ÷ V
Example: a 20,000 mAh power bank with 3.7 V cells holds 20,000 × 3.7 ÷ 1,000 = 74 Wh. Airlines set limits in Wh because it measures energy whatever the voltage. The watt-hour guide explains why 3.7 V, not the 5 V printed next to the USB port.
mAh to Wh at 3.7 V
| Capacity | Watt-hours | Milliwatt-hours | Amp-hours |
|---|---|---|---|
| 5,000 mAh | 18.5 Wh | 18,500 mWh | 5 Ah |
| 10,000 mAh | 37 Wh | 37,000 mWh | 10 Ah |
| 15,000 mAh | 55.5 Wh | 55,500 mWh | 15 Ah |
| 20,000 mAh | 74 Wh | 74,000 mWh | 20 Ah |
| 25,000 mAh | 92.5 Wh | 92,500 mWh | 25 Ah |
| 26,800 mAh | 99.2 Wh | 99,160 mWh | 26.8 Ah |
| 27,000 mAh | 99.9 Wh | 99,900 mWh | 27 Ah |
| 30,000 mAh | 111 Wh | 111,000 mWh | 30 Ah |
| 40,000 mAh | 148 Wh | 148,000 mWh | 40 Ah |
| 50,000 mAh | 185 Wh | 185,000 mWh | 50 Ah |