Independent calculator · transparent inputs
E-Bike Range Calculator
Plan a riding-energy and charge window from your own battery and consumption evidence. Example inputs are visible assumptions, with no automatic rider-weight, weather or battery-age coefficients.
Sources checked 9 October 2026. Example inputs are scenarios; use your own bill, equipment or trip measurements.
Your inputs
The default is an illustrative input, not a manufacturer specification. Nominal pack-label Wh can exceed energy accessible in use.
Use measurements from comparable rides. The default is a worked-example assumption; the tool does not infer this rate from assist mode, rider weight or weather.
Include the return journey if there is no planned recharge.
Your calculation
Use a riding measurement instead of a universal multiplier
Distance budget = usable full-charge Wh × (start − reserve) ÷ 100 ÷ battery Wh/mile
This is an energy-budget calculation. It assumes the usable state-of-charge percentage is approximately proportional to battery energy and that consumption remains similar to the sample you enter. A few display bars or nominal voltage readings do not establish a precise energy measurement. Results are scenarios and are not an assurance that a particular ride is achievable.
If a display reports reliable battery energy, divide the energy used by the ride distance. With only a reasonably informative percentage gauge and a usable-energy estimate, 20 miles using 40% of a 500 Wh usable pack implies about 10 Wh/mile: 500 × 0.40 ÷ 20. This is a worked example. Use several similar rides; do not deliberately run the battery to empty to obtain a measurement. A wall charging meter measures charger-input energy and can include losses, so it should not be substituted directly for battery energy used.
Build an assist-specific e-bike record
Bosch identifies temperature, cadence, stopping, gearing, tire pressure and total load among the factors that change e-bike range. The calculator does not turn those influences into universal percentage deductions. Record the assist setting, route, rider and luggage, and use a sample that resembles the planned ride.
A low-assist leisure ride and a high-assist cargo commute describe different electric demands. Rider pedaling is already reflected in a measured battery-consumption figure; adding an assumed human-power bonus on top would change the evidence. A nominal motor wattage also describes power, rather than watt-hours consumed per mile, and does not determine range by itself.
For a tour, record the full outward and return distance, stops with dependable charging and any substantial climbs. If the route has unfamiliar gradients or wind, test a comparable shorter ride first and select a reserve that leaves options. The tool does not guarantee a lower assist setting will rescue an otherwise over-budget journey.
Worked e-bike charge window
With an illustrative 500 Wh usable-energy input and consumption of 10 Wh/mile, leaving at 80% and keeping 10% makes 350 Wh available. That yields 35.0 miles. A 20-mile ride uses 200 Wh and ends at an estimated 40% charge. Those numbers describe the inputs, not a tested range for every 500 Wh e-bike.
Battery and charging instructions remain model-specific
CPSC guidance says to use the supplied charger, an approved replacement battery and the manufacturer’s charging instructions, and to remain present while charging. A matching plug or an energy calculation does not establish charger or range-extender compatibility. Check the exact product for applicable recall or safety notices.
Use the manufacturer’s storage and charging-temperature guidance for the battery you own. This tool adds no universal annual degradation curve, charging-temperature rule or lifespan promise. If a pack’s usable capacity has changed, use appropriate measured evidence or manufacturer diagnostics instead of inferring a fixed loss from its age.
Questions and answers
Are the default battery and consumption figures tested product ratings?
No. They are illustrative example inputs. Enter usable-energy and consumption evidence for your own vehicle and comparable riding conditions.
Does the tool automatically adjust for weight, weather or riding mode?
No. Those influences should be reflected in a comparable consumption measurement. The calculator adds no universal weight, temperature, terrain or mode multiplier.
Can I use nominal volts times amp-hours as usable battery energy?
Nominal voltage times amp-hours estimates nominal pack watt-hours. Accessible energy can differ because of battery management, condition and temperature; do not label a nominal figure as a verified usable measurement.