Battery Capacity Converter – mAh to Wh & Wh to mAh Calculator
Convert smartphone battery capacity between milliamp-hours (mAh) and watt-hours (Wh) effortlessly with our free battery capacity converter. Enter your battery’s voltage and capacity to get accurate conversions in both directions. Perfect for comparing phone batteries, understanding battery labels, and electrical calculations. No installation required — 100% browser-based phone battery conversion tool.
Battery Capacity Converter (mAh ↔ Wh)
Convert between milliamp-hours and watt-hours
Battery Capacity Converter (mAh ↔ Wh) Features
- Converts battery capacity between milliamp-hours (mAh) and watt-hours (Wh)
- Supports both conversion directions: mAh to Wh and Wh to mAh
- Requires voltage input for accurate energy conversion calculations
- Useful for comparing batteries across different devices and standards
- Helps understand actual energy stored in any rechargeable battery
- Displays result value and unit clearly in the output section
How to Use Battery Capacity Converter (mAh ↔ Wh)
- Select the conversion direction from the dropdown: “mAh → Wh” or “Wh → mAh”
- Enter the battery value (e.g., 5000 for mAh or the Wh value) in the “Value” field
- Enter the battery voltage in volts (e.g., 3.8) in the “Voltage” field
- Click the Calculate button
- View the converted result and its unit in the results section
- Click Reset to start a new conversion
Frequently Asked Questions
Wh = (mAh × Voltage) ÷ 1000. For example, a 4000mAh battery at 3.7V = 14.8 Wh. Our battery capacity converter performs this calculation instantly with any voltage input.
mAh = (Wh × 1000) ÷ Voltage. For example, 15 Wh at 3.7V = 4054 mAh approximately. Enter the values in our Wh to mAh calculator for instant results.
Airlines regulate battery capacity using watt-hours (Wh) because it accounts for both capacity and voltage, giving a true measure of stored energy. Batteries under 100 Wh are typically allowed in carry-on luggage.
Most lithium-ion smartphone batteries operate at a nominal voltage of 3.7V or 3.85V. Check your phone’s battery label or specifications for the exact voltage before converting.
Most smartphones have batteries between 10–20 Wh (approximately 2500–5000 mAh at 3.7V). Flagship phones with large batteries can reach 18–20 Wh or more.
Wh is technically more accurate since it accounts for voltage differences between batteries. However, mAh is more commonly used in consumer smartphone specifications for simplicity.
Yes, this mAh to Wh converter works for any lithium-ion battery — smartphones, tablets, laptops, or power banks — as long as you input the correct voltage rating.
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