CYCLE CALCULATORS

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 as a reserve.

Inputs

Units
Total climbing ÷ distance. 600 m over 30 km is 2%.

Results

Estimated range
38 km
Consumption
11.9 Wh/km

The Result is indicative and educational. It does not constitute a design, a technical opinion or medical advice and does not replace calculations or verification by a person with the appropriate qualifications and authorisations. Before purchase, installation or use in practice – in particular in electrical installations – the Result should be verified by a qualified specialist. Details: Terms of Service, point 4.

How the number is made

Watt-hours per km start at 5.5 (eco), 8.5 (trail) or 11 (turbo) on the flat, then multiply by (1 + gradient% ÷ 5), so a 5% average doubles them. Range km = battery Wh × 0.9 ÷ that consumption. Example: 500 Wh, trail, 2% → 8.5 × 1.4 = 11.9 Wh/km → 450 ÷ 11.9 = 38 km.

Motor watt rating is not an input. Flat-road tests of Bosch motors land near 5.5, 8 and 10.5 Wh/km. The gradient factor matches a BIKE magazine test within 5%: an 8.5% road climbed until a 400 Wh pack was empty gave 1110 m in turbo, 1525 m in tour and about 2200 m in eco. The bands assume about 100 kg of rider and bike. Your own pedalling, extra weight, wind, tyres and cold are outside the model. Ten percent of the pack is held back.

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Questions

Why 90% of the watt-hours?

It is a reserve. Cold weather and an ageing pack both cut the usable capacity, and the last climb is no place to run out.

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.

Example products

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