Battery Capacity Converter
Convert battery capacity between mAh, Ah, Wh, and kWh.
Adjustable voltage for accurate conversions.
Enter voltage and any capacity value — the others update instantly.
Battery capacity can be measured in amp-hours (Ah) or watt-hours (Wh). Converting between them requires knowing the voltage.
Core formulas:
- Wh = Ah × Voltage
- Ah = Wh / Voltage
- mAh = Ah × 1,000
- kWh = Wh / 1,000
Common battery voltages:
| Battery Type | Nominal Voltage |
|---|---|
| AA/AAA (NiMH) | 1.2 V |
| AA/AAA (Alkaline) | 1.5 V |
| Li-ion cell (18650) | 3.7 V |
| Phone battery | 3.7-3.85 V |
| Laptop battery | 11.1-14.8 V |
| Car battery (12V) | 12.6 V |
| EV battery pack | 350-800 V |
Example conversions:
- Phone: 5,000 mAh at 3.7V = 18.5 Wh
- Power bank: 20,000 mAh at 3.7V = 74 Wh
- Laptop: 56 Wh at 11.1V = 5,045 mAh
- Tesla Model 3: 60 kWh at 350V = 171.4 Ah
Airline limit: Most airlines allow batteries up to 100 Wh in carry-on. Batteries 100-160 Wh need airline approval.