How To Calculate Watt Hours Of A Battery


Estimating the energy capacity of a battery is essential for various applications, from electronics to renewable energy systems. Our Watt-Hour calculator simplifies this process by calculating the Watt-Hours of a battery based on its voltage and capacity.


The formula for calculating Watt-Hours of a battery is given by:

Watt-Hours=Voltage (Volts)×Capacity (Ah)Watt-Hours=Voltage (Volts)×Capacity (Ah)

How to Use

Follow these simple steps to calculate the Watt-Hours of a battery:

  1. Enter the voltage of the battery in volts in the “Voltage” input field.
  2. Input the capacity of the battery in ampere-hours (Ah) in the “Capacity” input field.
  3. Click the “Calculate” button to obtain the Watt-Hours.
  4. The result will display the calculated Watt-Hours with precision.


For example, if a battery has a voltage of 12 volts and a capacity of 50 ampere-hours, the calculator would display “Watt-Hours: 600 Wh.”


  1. Q: Why is it important to calculate Watt-Hours for a battery?
    • A: Calculating Watt-Hours helps determine how much energy a battery can store, aiding in selecting the right battery for specific applications.
  2. Q: Can I use the calculator for different battery chemistries?
    • A: Yes, the calculator is applicable to batteries of various chemistries. Ensure consistent units for accurate results.
  3. Q: Does the calculator consider battery efficiency?
    • A: No, the calculator provides the raw energy capacity. Consider efficiency separately for a comprehensive assessment.
  4. Q: Is this calculator suitable for automotive batteries?
    • A: Yes, the calculator can be used for automotive batteries by inputting the battery’s voltage and capacity.
  5. Q: How can I convert Watt-Hours to other energy units?
    • A: To convert Watt-Hours to kilowatt-hours (kWh), divide by 1000. kWh=Watt-Hours1000kWh=1000Watt-Hours​.


Understanding the energy capacity of a battery is crucial for designing efficient systems. Use our Watt-Hour calculator to quickly assess the Watt-Hours of a battery based on its voltage and capacity. This tool is valuable for anyone working with batteries, ensuring optimal performance in diverse applications.

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