About This Calculator
An e-bike battery’s total energy is usually measured in watt-hours (Wh). Watt-hours tell you how much energy the battery can store, which makes it one of the most useful numbers when comparing different e-bike batteries for range and overall capacity.
The basic relationship is simple: watt-hours = volts × amp-hours. Voltage represents electrical pressure, while amp-hours represent how much current the battery can deliver over time. If you know any two of these values, you can calculate the third and better understand your battery pack specifications.
This ebike battery calculator is useful when shopping for a replacement battery, comparing 36V, 48V, or 52V systems, or checking whether a listed battery capacity makes sense. Keep in mind that real-world range also depends on rider weight, terrain, tire pressure, assist level, wind, and motor efficiency.
Frequently Asked Questions
How do I calculate e-bike battery watt-hours?
Multiply battery voltage by amp-hours. For example, a 48V 15Ah battery has 720Wh of energy capacity.
Is a higher Wh battery better for range?
Usually yes. A higher watt-hour rating means the battery stores more energy, which can increase range under similar riding conditions.
Can two batteries with the same Wh have different volts and Ah?
Yes. For example, 36V 20Ah and 48V 15Ah are both 720Wh, even though their voltage and amp-hour values differ.