Fondsites Tools
The E-Bike Workshop
Range Reality Calculator
Turn an optimistic range number into a conservative route planning estimate.
This calculator does not promise range. It helps you see how hills, cold, wind, cargo, assist level, and battery age can shrink a perfect number.
Use the result to choose reserve, lower assist, destination charging, a shorter route, transit backup, or a different vehicle.
Interactive Tool
Range Reality Calculator
Change the inputs and the result updates in your browser. Results are not saved, shared, or added to the URL.
Result
Adjust the fields to calculate a result.
How to use this tool
- Enter the optimistic range from your bike, app, or recent best-case ride.
- Choose assist level, terrain, weather, cargo, wind, battery age, and reserve.
- Treat the result as a planning margin, not a guarantee.
What the result means
Usable range is the estimated range after conditions and reserve.
If the route distance is near or above the usable range, make the plan more conservative.
Assumptions and limitations
The tool uses broad factors, not a motor model.
Battery condition, tire pressure, rider effort, speed, mechanical drag, and route details can change results.