Enter both values to calculate milliamp hours
Watt Hours (Wh)
Volts (V)
Common:
Milliamp Hours (mAh)
Result will appear here
Understanding Power Bank Capacity
Power bank capacity can be measured in mAh or Wh:
- Energy (Wh) = Capacity (mAh) × Voltage (V) ÷ 1000
- Capacity (mAh) = Energy (Wh) × 1000 ÷ Voltage (V)
For USB and Portable Power
Understanding these relationships helps you:
- Compare power banks - Use Wh for accurate comparison
- Airlines allow 100Wh - Know if your power bank is carry-on safe
- Calculate charges - How many phone charges you'll get
- Size solar chargers - Match panel to power bank capacity
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