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Guide

E-Bike Range Estimator

E-bike range estimator: calculate distance from battery Wh, assist level, rider weight, and wind/terrain factors. Physics-based Wh/km planning—free, instant.

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Brochure range rarely matches your commute. This guide walks through the e-bike range estimator—usable watt-hours, assist multiplier, and terrain—before you plan a long ride or size a battery upgrade.

Benefits

  • Range = usable Wh ÷ Wh/km with transparent assist, weight, and wind/terrain multipliers.
  • Pack efficiency input separates nameplate Wh from energy that reaches the motor.
  • Pairs with voltage-sag and charging-cost tools for full ride and ownership planning.

How it works

  1. Enter battery capacity (Wh) and pack efficiency (typical 88–95%).
  2. Set base Wh/km, pedal-assist level (1–5), total rider+bike mass, and wind/terrain factor.
  3. Review estimated range in km and the effective Wh/km used in the calculation.

FAQ

How do I estimate e-bike range?

Divide usable battery Wh by consumption Wh/km. Example: 500 Wh at 92% efficiency → 460 Wh usable; at 12 Wh/km effective consumption that is about 38 km. Raise assist level or headwind factors to see range drop.

What is a typical Wh/km for e-bikes?

Many commuters fall between 8–12 Wh/km on flat ground at moderate assist. Hills, strong headwinds, heavy loads, and max assist can push 15–20+ Wh/km—use the wind/terrain factor and assist level inputs to bracket your route.

Why is my real range lower than the calculator?

Cold batteries, voltage sag on climbs, stop-and-go traffic, and under-inflated tyres all raise Wh/km. Start with manufacturer Wh and your usual assist level, then add margin for winter or hilly return legs.

Technical specifications

  • Usable Wh = battery_Wh × pack_efficiency.
  • Wh/km ≈ base_Wh/km × assist_multiplier × wind_terrain_factor + weight_penalty.
  • Range_km = usable_Wh ÷ Wh/km.
  • Related: ebike-voltage-sag, ebike-charging-cost, ebike-weight-performance.

Assist level drives consumption

Higher pedal-assist levels multiply baseline Wh/km—Level 5 can draw roughly 2.5× the energy of Level 1 on the same route. Commute planning should use the assist you actually ride, not the eco mode from the marketing page.

Weight and terrain compound

Total mass (rider, cargo, bike) adds a Wh/km penalty above a reference weight. Wind and grade factors stack on top. A flat outbound leg with a headwind return can mean two different consumption figures—rerun the estimator for worst-case direction.