E-bike Range & Battery Size Calculator
Estimate e-bike range from battery energy and consumption, or work backward from your trip distance to the battery capacity you need.
Estimated riding range
20 mi.
Based on the battery energy and consumption you entered.
Wind, hills, speed, temperature, pedalling and tyre pressure all affect energy use. When choosing a pack, check its voltage, current rating, connectors and physical fit as well as its Wh rating.
How far will a 500 Wh e-bike battery go?
With 80% of its rated energy available for the ride, a 500 Wh battery provides 400 Wh. At an assumed 20 Wh per mile, that is 20 miles. At 25 Wh per mile, it is 16 miles. Enter both consumption values above to compare those outcomes.
Available Wh = nominal battery Wh × available fraction
Range = available Wh ÷ consumption per mile or kilometre
Required nominal Wh = trip distance × consumption ÷ available fraction
How much battery do I need for a 30-mile trip?
At 20 Wh per mile, the ride uses 600 Wh. If you plan to use 80% of the battery’s nominal energy, the required rating is 600 ÷ 0.8 = 750 Wh. Use the higher consumption value to plan for a more demanding ride.
Use your own riding data
Divide the battery energy used on a typical ride by the distance travelled. Check whether your result is in Wh per mile or Wh per kilometre. A meter at the wall also counts charging losses, so it will read more energy than the battery supplied during the ride. Count each reserve or loss once, either in consumption or in the available-energy percentage.
What else affects e-bike range?
This calculator uses the consumption you enter. Your route, motor and assistance level all affect that number. Bosch’s e-bike range assistant accounts for riding conditions and equipment when estimating range for a specific bike. The consumption example above is our editable starting value, not a Bosch rating.
The unit conversions follow NIST’s unit conversion reference. Battery Wh = nominal V × Ah; one mile is 1.609344 km.