mAh to Wh
Convert milliamp-hours to watt-hours using voltage: Wh = (mAh / 1000) × V. Default 5000 mAh at 3.7 V is 18.5 Wh. Voltage is required. Not on the energy hub without voltage.
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How to convert mAh to Wh
- Enter milliamp-hours. Default is 5000 mAh.
- Enter pack or cell voltage. Default 3.7 V is a common lithium-ion nominal.
- Keep From as mAh and To as Wh, or swap units.
- Airline Wh limits need this voltage step. Nothing is uploaded.
Milliamp-hour to watt-hour
Charge times voltage
| mAh | Charge unit on many battery labels |
|---|---|
| Wh | Energy for airline and pack comparisons |
| Voltage | Required. Wh = (mAh/1000) × V |
| Default | 5000 mAh × 3.7 V = 18.5 Wh |
| Inverse | Wh to mAh on wh-to-mah page |
| Hub note | Energy hub skips mAh because V is required |
Why voltage is required
mAh is charge. Wh is energy. Without volts, mAh does not fix energy. Wh = (mAh/1000) × V. Five thousand mAh at 3.7 V is 18.5 Wh.
Airline limits
Spare lithium limits are often in Wh. Convert label mAh with the cell voltage you will declare.
Wh to mAh
Wh to mAh divides by voltage instead of multiplying.
Not power draw
Runtime current draw is separate from label conversion. See watts to amps for electrical load math.
Limits
Nominal voltage only.
The formula runs in this tab. CZNull does not receive the numbers.
How many Wh is 5000 mAh at 3.7 V?
18.5 Wh. Compute (5000/1000) × 3.7.
Why is 3.7 V the default?
It is a common single-cell lithium-ion nominal voltage for label math, not a live measurement.
Can I convert Wh back to mAh?
Yes on the wh-to-mAh page with the same voltage.
Is mAh on the energy converter hub?
No. The hub avoids mAh because it never asks for voltage.
Does this include DC-DC efficiency?
No. It converts label charge and typed voltage only.