E-Bike Electricity Cost per 100 km Calculator
Calculate your e-bike electricity cost per 100 km from Wh/km, electricity price, and optional charging efficiency. See cost per km and energy used.
Last updated: July 2026
Estimated electricity cost per 100 km
Cost per 100 km
Based on the entered Wh/km, electricity price, and charging-efficiency assumption.
Calculation using your values
This is an estimated electricity cost based on your inputs. Actual Wh/km and charging losses can vary.
How to calculate e-bike electricity cost per 100 km
First calculate energy for 100 km as Wh/km × 100. Divide by 1,000 to convert watt-hours to kilowatt-hours. If charging losses are included, divide ride energy by charging efficiency as a decimal. Finally, multiply estimated wall energy by the electricity price per kWh.
Cost per 100 km = (Wh/km × 100 ÷ 1,000 ÷ charging efficiency) × price per kWh
For example, 90% efficiency is entered into the formula as 0.90.
What does Wh/km mean?
Wh/km means watt-hours of battery energy used to travel one kilometer. At 12 Wh/km, traveling 100 km uses 1,200 Wh, or 1.2 kWh, of ride energy before accounting for charging losses.
Why doesn't this calculator ask for battery size?
When Wh/km is known, it directly describes energy consumption over distance. Battery capacity mainly determines available range before recharging; it does not change cost per kilometer by itself. Two bikes consuming 12 Wh/km have the same travel-energy use per 100 km even if one has a 500 Wh battery and the other has a 1,000 Wh battery.
How charging losses affect wall energy
Ride energy delivered by the battery and electricity drawn from the outlet are not always identical. Charging electronics and the battery can lose energy, so the calculator lets you enter your own efficiency assumption. At 100%, losses are ignored. No lower efficiency is silently assumed or presented as universal.
Why actual e-bike energy use can vary
Speed, rider and cargo weight, hills, acceleration, wind, tire pressure, assist level, throttle use, temperature, and battery or drivetrain condition can change real Wh/km. You can account for these conditions by using energy-consumption data from your own riding rather than relying on arbitrary hidden adjustment factors.
Worked examples
12 Wh/km at 100% efficiency
At 12 Wh/km, 100 km uses 1.2 kWh. With electricity priced at 0.25 per kWh and losses ignored, cost is 1.2 × 0.25 = 0.30 per 100 km, 0.03 per 10 km, or 0.003 per km.
12 Wh/km with 90% charging efficiency
Ride energy remains 1.2 kWh. Estimated wall energy is 1.2 ÷ 0.90 = 1.333333333… kWh. At 0.25 per kWh, estimated cost is 0.333333333… per 100 km, normally displayed as approximately 0.33 in a two-decimal currency.
Higher energy use
At 20 Wh/km, 100 km uses 2 kWh. At 0.30 per kWh and 100% charging efficiency, estimated electricity cost is 0.60 per 100 km.
Free charging
At 15 Wh/km, a zero electricity price produces zero electricity cost even when estimated wall energy includes a 90% charging-efficiency assumption.
What this operating-cost estimate includes
This tool estimates electricity cost for distance based on Wh/km, wall-energy efficiency, and electricity price. It does not include purchase price, maintenance, tires, insurance, financing, depreciation, or battery replacement. It also does not calculate battery charge from one state of charge to another.
Frequently asked questions
How much electricity does an e-bike use per 100 km?
Multiply Wh/km by 100, then divide by 1,000 to express the result in kWh.
How do I calculate e-bike electricity cost?
Multiply estimated wall-energy use in kWh by the electricity price per kWh.
What does Wh/km mean?
It is the watt-hours of battery energy used per kilometer.
Does battery size change electricity cost per 100 km?
Not directly when Wh/km is already known. Battery capacity mainly affects available range.
Why does charging efficiency matter?
When charging is less than 100% efficient, more energy must be drawn from the outlet than the battery delivers for riding.
Does this include maintenance or battery replacement?
No. It estimates electricity cost only.