E-Bike Range Calculator
Estimate how far an electric bicycle can travel from its usable battery energy, or work backward from a target trip distance to the battery capacity required.
Ride assumptions
Edit battery or range; the other value is solved automatically.
Usable energy shown on the battery label. Accepted format: 680 or 0.68.
Efficient favors flat, gentle riding; Extreme represents steep, rough, or high-assist use.
Estimated one-charge distance, or your target distance when sizing a battery.
Live result
Calculated from battery capacity
Estimated range is 34.00 miles under average riding conditions.
How riding conditions change range
Same battery, three planning assumptions
The average estimate sits between a favorable 14 Wh/mi case and a demanding 26 Wh/mi case.
Scenario comparison
Calculated from the current battery capacity
| Riding condition | Energy use | Range (mi) | Range (km) |
|---|
These scenarios are planning benchmarks, not a guarantee. Wind, temperature, tire pressure, speed, payload, motor efficiency, assistance level, and battery age can move actual range materially.
How to use the e-bike range calculator
What this calculator does
This calculator estimates the distance an electric bicycle can cover from usable battery energy and a simplified riding-condition factor. It also works in reverse: enter a target trip distance and it estimates the battery capacity needed for that scenario. The model is intended for route planning, battery comparison, commuting checks, and early purchase decisions. It does not predict the exact range of a particular bicycle because real performance also depends on the motor, controller, rider and cargo weight, speed, hills, wind, tire pressure, temperature, battery health, and the amount of pedaling assistance supplied by the rider.
When to use it
Use the calculator before a commute to check whether one charge should cover the round trip; when comparing two batteries with different watt-hour ratings; when planning a recreational route with a sensible reserve; or when deciding what battery size is appropriate for a desired distance. Bosch explains that watt-hours describe the energy stored in an e-bike battery and are directly relevant to achievable range in its e-bike battery guide.
How to calculate
- The calculator opens with a ready-to-use demonstration: 680 Wh, Average conditions, and a calculated range of 34.00 mi. The example Excel workbook is available immediately.
- To estimate range, replace Battery capacity with the usable watt-hour rating printed on the battery, choose Wh or kWh, and select the Riding condition scenario. Editing battery capacity makes range the solved value.
- To size a battery, type your target into Range, choose mi or km, and select the riding scenario. Editing range makes battery capacity the solved value.
- Read Estimated range or Required battery capacity as the primary result. Review the supporting cards, chart, and scenario table before committing to a route.
- Select Download Excel to create a current-state workbook with inputs, outputs, scenario comparisons, and model notes. Reset clears the demonstration and all calculated content; Excel export stays disabled until a complete valid value is entered again.
Input guide
Battery capacity is a required positive decimal when estimating range. Enter a value such as 680 in Wh or 0.68 in kWh. The parser accepts a decimal point and optional U.S.-style thousands separators; it rejects decimal commas, scientific notation, negative values, and unsupported symbols. Higher capacity increases estimated range in direct proportion. Do not confuse watt-hours, which measure stored energy, with watts, which measure instantaneous power.
Battery capacity unit switches between Wh and kWh and converts the current value rather than merely relabeling it. One kWh equals 1,000 Wh. Riding condition scenario is required and offers Efficient, Average, and Extreme. Efficient uses 14 Wh/mi for gentle riding on favorable terrain; Average uses 20 Wh/mi for mixed daily use; Extreme uses 26 Wh/mi for steep, rough, high-assist, or otherwise demanding riding. A more demanding scenario lowers range for the same battery and raises required capacity for the same target distance.
Range is the solved distance when battery capacity was edited most recently, or a required positive target when range itself was edited. Enter values such as 34 mi or 55 km using the adjacent Range unit. The unit switch converts the current value between miles and kilometers. Avoid entering a promotional “maximum range” from a product page as though it were a measured trip requirement; use the actual route distance and include a reserve.
Output guide
Estimated range is the one-charge planning estimate in the selected distance unit. In reverse mode, the primary result becomes Required battery capacity. Battery energy reports the canonical watt-hour value used by the model. Energy consumption is the scenario factor in Wh/mi. Metric range shows the same distance in kilometers, and 10% reserve distance reduces the estimated range to 90% for a modest planning buffer. Zero is not treated as a useful ride plan; missing, nonnumeric, or nonpositive values produce a validation message instead of a result.
The How riding conditions change range chart and the Scenario comparison table use the same current battery capacity. Each table row lists Riding condition, Energy use, Range (mi), and Range (km). The highlighted row is the selected scenario. A taller bar or larger table value means greater estimated distance, not greater battery drain. These outputs are estimates derived from fixed benchmark consumption factors, not measurements from the bicycle.
Worked example
With the startup values, the model divides 680 Wh by the Average consumption assumption of 20 Wh/mi: 680 ÷ 20 = 34.00 mi. Converting miles to kilometers gives 54.72 km. Applying a 10% route reserve gives 30.60 mi. The same battery produces about 48.57 mi in Efficient conditions and 26.15 mi in Extreme conditions. Those exact values populate the opening cards, chart, table, and downloadable workbook.
How the range estimate works
The underlying relationship is energy divided by energy use per unit of distance. Battery capacity is normalized to watt-hours and distance is normalized to miles before calculation.
The reverse calculation multiplies target range by consumption. Because the relationship is linear, doubling usable battery capacity doubles the estimate when every other assumption stays unchanged. Similarly, moving from the 14 Wh/mi Efficient case to the 26 Wh/mi Extreme case cuts the estimated distance by roughly 46% for the same battery.
These benchmark factors reproduce the calculator's scenario logic and provide a transparent planning model. Real bicycles can vary widely. REI's introduction to electric-bike range factors notes that assist mode, hills, total weight, cadence, and cold temperatures can all alter battery life. For a more equipment-specific estimate, compare this result with the manufacturer's specifications or a detailed tool such as the Bosch eBike Range Assistant.
Planning with uncertainty and battery reserve
A route plan should normally use a distance lower than the theoretical estimate. The 10% reserve card is a quick starting point, but a larger margin may be appropriate for winter temperatures, long climbs, headwinds, cargo, older batteries, high assistance levels, or limited charging options. On an unfamiliar route, compare the Efficient, Average, and Extreme rows instead of relying on one number. If the trip is still feasible in the Extreme case, the plan has more resilience.
Battery labels usually show nominal capacity, while usable energy can be lower because the battery-management system protects cells near full charge and deep discharge. Battery aging can also reduce effective capacity. For conservative planning, enter the capacity you realistically expect to use, not necessarily the original advertised value.