mAh to Wh Converter
Convert battery capacity between milliamp-hours and watt-hours
mAh to Wh Converter
Convert battery capacity between milliamp-hours and watt-hours
Common Battery Types
About mAh and Wh
mAh (milliamp-hours) represents electric charge, indicating how much current a battery can deliver over time.
Wh (watt-hours) represents energy capacity, showing the total energy a battery can store and deliver.
Converting between them requires knowing the battery voltage, as energy equals charge multiplied by voltage.
Key Formulas
Practical Tips
• Higher Wh means more energy storage
• Airlines limit batteries by Wh, not mAh
• Compare batteries using Wh for accuracy
• Higher voltage needs fewer mAh for same Wh
• Always check voltage when comparing
Understanding the Conversion
What is mAh?
Milliamp-hours (mAh) measure electric charge capacity. A 3000mAh battery can deliver 3000 milliamps for one hour, or 1500 milliamps for two hours.
What is Wh?
Watt-hours (Wh) measure energy capacity. It represents the actual energy stored in the battery, accounting for both charge and voltage.
Why Voltage Matters
Two batteries with the same mAh but different voltages store different amounts of energy. Higher voltage means more energy storage.
Common Applications
Smartphone Batteries
Typically 3000-5000mAh at 3.7V, equivalent to 11-19Wh
Laptop Batteries
Usually 40-100Wh at 11-15V for extended runtime
Power Banks
Range from 20-100Wh, often limited by airline regulations
Electric Vehicles
Large battery packs measured in kWh (1000Wh = 1kWh)
Battery Comparison Examples
| Device | Capacity (mAh) | Voltage (V) | Energy (Wh) |
|---|---|---|---|
| iPhone 14 | 3279 mAh | 3.83 V | 12.56 Wh |
| Samsung Galaxy S23 | 3900 mAh | 3.85 V | 15.02 Wh |
| MacBook Air | 4382 mAh | 11.47 V | 50.26 Wh |
| 20000mAh Power Bank | 20000 mAh | 3.7 V | 74 Wh |
How to Use This Converter
Select Conversion Direction
Choose whether to convert from mAh to Wh or from Wh to mAh based on your needs.
Enter Values
Input the capacity value and voltage. You can use the preset buttons for common battery types.
View Results
Get instant conversion results with detailed metrics including joules and alternative units.
Common Batteries
About
Convert battery capacity between mAh and Wh. mAh measures charge while Wh measures energy.
Tips
• Use Wh for accurate battery comparison
• Airlines limit batteries by Wh rating
• Higher voltage = more energy per mAh