mAh to Wh Calculator
Convert milliamp-hours (mAh) to watt-hours (Wh) to compare battery energy across devices.
mAh
V
ENERGY
18.5 Wh
IN kWh
0.0185 kWh
FORMULA
Wh = mAh ร V / 1000
mAh to Wh โ Battery Table (3.7V Li-ion)
| mAh | Wh (3.7V) | Wh (3.85V) | Wh (7.4V) |
|---|---|---|---|
| 1,000 | 3.7 | 3.9 | 7.4 |
| 2,000 | 7.4 | 7.7 | 14.8 |
| 3,000 | 11.1 | 11.6 | 22.2 |
| 4,000 | 14.8 | 15.4 | 29.6 |
| 5,000 | 18.5 | 19.3 | 37 |
| 6,000 | 22.2 | 23.1 | 44.4 |
| 8,000 | 29.6 | 30.8 | 59.2 |
| 10,000 | 37 | 38.5 | 74 |
| 15,000 | 55.5 | 57.8 | 111 |
| 20,000 | 74 | 77 | 148 |
๐ก How to Convert mAh to Wh
Formula
Wh = (mAh ร V) / 1,000
Example: 5,000 mAh at 3.7V โ Wh = (5,000 ร 3.7) / 1,000 = 18.5 Wh
Example: 5,000 mAh at 3.7V โ Wh = (5,000 ร 3.7) / 1,000 = 18.5 Wh
This conversion is important for airline travel โ the TSA/FAA limit for carry-on lithium batteries is 100 Wh (160 Wh with airline approval).
5,000 mAh ร 3.7V / 1,000 = 18.5 Wh. TSA limit: 100 Wh for carry-on batteries.