Use our free mAh to Wh calculator to convert battery capacity from milliamp hours (mAh) to watt hours (Wh) using voltage — perfect for power banks, drones, laptops, and airline travel compliance.
Formula: Watt Hours = (Milliamp Hours ÷ 1000) × Voltage
Watt Hours
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Wh
How to Use the Milliamp Hours Conversion Calculator
Enter the Milliamp Hours (mAh) of your battery or device.
Enter the Voltage (V) — typically found on the battery label or product specs.
Click “Calculate Watt Hours” or simply type — results update in real time!
Your Watt Hours (Wh) result will appear instantly with a detailed breakdown.
