Wh to mAh Calculator
Enter your battery's Energy in Wh and Voltage in V into the Wh to mAh Calculator, and you'll get the equivalent Milliamp-Hours (mAh) — so you can finally compare battery capacities on the same terms.
Results
Milliamp-Hours
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Frequently Asked Questions
How do you convert watt-hours to milliamp-hours?
To convert Wh to mAh, use the formula: mAh = (Wh × 1000) ÷ Voltage. Multiply watt-hours by 1000 and divide by the voltage in volts.
What is the difference between Wh and mAh?
Wh (watt-hours) measures energy capacity, while mAh (milliamp-hours) measures charge capacity. Wh tells you how much energy a battery can store, while mAh tells you how much current it can deliver over time.
Why do I need voltage to convert Wh to mAh?
Voltage is essential because the relationship between energy (Wh) and charge (mAh) depends on the electrical potential. The same energy at different voltages will result in different charge capacities.
Can I convert mAh back to Wh?
Yes, you can convert mAh to Wh using the formula: Wh = (mAh × Voltage) ÷ 1000. You still need to know the voltage for this conversion.
What voltage should I use for common batteries?
Common battery voltages: AA/AAA alkaline (1.5V), Lithium-ion phone batteries (3.7V), car batteries (12V), and laptop batteries (10.8V to 14.8V). Check your battery label for the exact voltage.
Is this calculator accurate for all battery types?
Yes, this calculator works for all battery types as long as you use the correct voltage. The conversion formula is universal and applies to lithium-ion, alkaline, lead-acid, and other battery chemistries.
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