Try it out below, Inputs via the two sliders and output at the bottom in yellow. Several battery sizes (Amp-hours) are provided, depending on the voltage of your battery. I’ve added some more detail below about the math behind the calculator if you’re interested.
Head back to the calculator main page here.
The Math Behind the Calculator is fairly simple, using the following units and terms:
Battery Capacity Required (Wh) = Power Demand per distance traveled (Wh / mile or km) x Typical Distance Traveled (miles or km)
Watt-Hour (Wh) is a unit of energy used to describe the amount of power (watts) used in one hour. This number is an indication of the size of your battery and the subsequent range of your ebike.
Watt-Hour (Wh) = Amp-hours (Ah) x Volts (v)
Amp Hours (Ah) is the amount of current a battery can discharge over one hour.
Volts (V) the difference of potential that would drive one ampere of current against one ohm resistance. Typical Voltage in Electric Bike batteries is 36v, 48v, 52v, and 72v. These are typically multiples of 12 volts.
Some Other Calculator Options
Bosch has a pretty extensive range calculator where you are able to change all sorts of variables, from rider weight, terrain, type of bike, tires, etc. Understandably, this calculator is limited to the Bosch line of products but has some helpful information.
Grin Technologies has a very detailed simulator with the ability to add custom batteries and controllers and set a wide variety of vehicle parameters to see how factors such as throttle level, bike weight, hill grade affect the performance of an ebike.
Ready to Buy a new Battery Pack for your Ebike?
I’ve put together another post about the cost of a new ebike battery and below are a few options for ebike battery sources:
- Amazon has a number of ebike batteries available, however, these are generally cheaper Chinese imports, so do your research and know that quality on these will often be less than the other options below
- Luna Cycle has a large selection of high-quality ebike batteries (US-based)
- Grin Technologies has a large selection of high-quality ebike batteries (Based in Canada)