CalculatorsE-Bike Battery Range Calculator

E-Bike Battery Range Calculator

Range is watt-hours divided by how hard the motor works. Eco on the flat stretches a pack; turbo on a climb empties it. Ten percent of the battery is held back so the estimate is not a dead-flat fantasy.

Inputs

Battery (Wh)AssistAverage gradient (%)

Results

Estimated range: 38 km
Consumption: 12.0 Wh/km

How the number is made

Watt-hours per km start at 6 (eco), 10 (trail) or 16 (turbo), then multiply by (1 + gradient% ÷ 10). Range km = battery Wh × 0.9 ÷ that consumption.

Motor watt rating is not an input. Eco, trail and turbo are fixed bands (6, 10 and 16 Wh/km) scaled by gradient, not by a named motor. Your own pedalling, wind, tyres and cold are outside the model. A 0% gradient is a flat road, not a descent credit. Ten percent of the pack is held back.

Related calculators

Calories and Carbs Calculator
The motor saves your legs; the hours still want food.
Power-to-Weight Calculator
Your own watts still move the bike between assist levels.

Questions

Why 90% of the watt-hours?

Packs are not ridden from 100% to 0%. A cutoff and a cold day both eat the last bit.

Does pedalling harder help?

Yes, and this model does not credit it. Dropping from turbo to eco is the lever the calculator does show.

Why is motor wattage not an input?

Range uses battery watt-hours, an assist rate and gradient. Motor watts are not in the formula. A climb increases consumption. A descent does not credit energy back.

Related gear

Spare charger at the turnaround
The range number is only useful if you can recharge where it says you will arrive.
$40–$150

Disclaimer — no professional advice, no liability

These calculators are simplified estimates for education. They are not a bike fit, a structural inspection, or a torque specification that overrides the number printed on a part. Confirm chain length, spoke length, tire fit and bolt torque on the bicycle before you ride.

These calculators, pages and any related content are provided “as is” and “as available”, solely for general educational and informational purposes. They are simplified mathematical estimates, not a professional bike fit, a structural inspection, a manufacturer torque specification or a training, nutrition or medical plan.

Results can be wrong, incomplete or inapplicable to your frame, wheels, tires, drivetrain or suspension. You must independently verify every figure, assume all risk, and confirm chain length before you cut, spoke length before you lace, tire and rim compatibility before you inflate, and the torque printed on the part before you tighten it.

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