mAh to Wh Calculator
Convert mAh to Wh or Wh to mAh using your battery’s nominal voltage.
EXAMPLE RESULT
Battery energy
37 Wh
- Energy
- 37 Wh
- Capacity
- 10,000 mAh
- Nominal voltage
- 3.7 V
Uses nominal battery voltage; USB conversion losses are not included.
How it works
Multiply milliamp-hours by the matching nominal battery voltage, then divide by 1,000 to get watt-hours. Reverse those steps for mAh. Use the voltage associated with the capacity label, not USB output voltage.