Wh ↔ Ah Converter – Convert Watt Hours and Amp Hours Online
Convert Watt Hours (Wh) and Amp Hours (Ah) Online
The free Wh ↔ Ah Converter from AkkuPlus allows you to quickly convert watt hours (Wh) into amp hours (Ah) and vice versa. This calculator is ideal for lithium-ion batteries, LiFePO4 batteries, e-bike batteries, power tool batteries, solar energy storage systems and custom battery packs.
Battery specifications are often provided in either watt hours (Wh) or amp hours (Ah). Understanding how to convert these values helps you compare batteries more accurately and determine the actual amount of stored energy.
Wh ↔ Ah Converter
Convert watt-hours (Wh) to ampere-hours (Ah) or vice versa.
How to Convert Wh to Ah
To calculate amp hours from watt hours, divide the energy value by the battery voltage.
Ah = Wh ÷ Voltage (V)
Example:
- Battery Energy: 360 Wh
- Voltage: 36 V
360 Wh ÷ 36 V = 10 Ah
How to Convert Ah to Wh
To calculate watt hours from amp hours, multiply the battery capacity by the battery voltage.
Wh = Voltage (V) × Ah
Example:
- Battery Voltage: 36 V
- Battery Capacity: 10 Ah
36 V × 10 Ah = 360 Wh
Why Are Watt Hours Important?
Many batteries are marketed primarily based on their amp-hour rating. However, watt hours provide a more complete picture because they include both voltage and capacity. This makes Wh the preferred value for comparing batteries operating at different voltages.
For example, two batteries may both have a capacity of 10 Ah, but if one operates at 12 volts and the other at 36 volts, their actual energy content will be significantly different.
Applications for the Wh ↔ Ah Converter
- Lithium-Ion Batteries (Li-Ion)
- Lithium Iron Phosphate Batteries (LiFePO4)
- E-Bike Batteries
- Power Tool Batteries
- Solar Energy Storage Systems
- Lead-Acid Batteries
- AGM Batteries
- Gel Batteries
- Industrial Battery Packs
- Custom Battery Solutions
Understanding Battery Capacity
Battery capacity is usually displayed in amp hours (Ah), while energy storage is displayed in watt hours (Wh). Knowing both values helps determine battery runtime, charging requirements and overall system performance.
The Wh ↔ Ah Converter provides a quick and accurate way to compare different battery technologies and battery sizes.
AkkuPlus – Your Battery Specialist
AkkuPlus offers replacement batteries, custom battery packs, battery rebuilding services, chargers and energy storage solutions for industrial and private applications. Use our Wh ↔ Ah Converter to better understand battery specifications and select the right battery for your needs.
Frequently Asked Questions
How do I convert Wh to Ah?
Divide the watt hours by the battery voltage. The formula is: Ah = Wh ÷ Voltage.
How do I convert Ah to Wh?
Multiply the battery capacity in amp hours by the battery voltage. The formula is: Wh = Voltage × Ah.
Why is Wh more important than Ah?
Watt hours include both voltage and capacity, providing a better comparison of the actual energy stored in different batteries.
Can I use this converter for e-bike batteries?
Yes. The calculator is suitable for e-bike batteries, solar batteries, power tool batteries and most rechargeable battery systems.
Are the calculations accurate?
Yes. The formulas are mathematically accurate. However, actual usable battery energy may vary due to temperature, age and operating conditions.
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Copilot said: A charge cycle describes a complete charge from 0% to 100% and back down again, whether it happens in a single session or is spread across multiple partial charges. How many of these cycles a lithium-ion battery can withstand before noticeable degradation occurs depends less on the cycle count itself and more on factors such as temperature, charging range, and depth of discharge. The industry typically defines the end of battery life, known as End of Life (EoL), at around 80% remaining capacity. In other words, charge cycles are only one piece of the puzzle and do not tell the whole story.
The most reliable method for measuring battery capacity is a controlled constant-current discharge. All other methods provide only estimates or trend indicators rather than true capacity values. In this process, the battery is discharged at a defined current down to its cutoff voltage, and the extracted charge is calculated using the formula: Capacity (Ah) = Current (A) × Time (h) The result is reproducible, compliant with industry standards, and can be directly evaluated as a measure of the battery’s State of Health (SoH).
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