Independent calculator · transparent inputs
EV Range Calculator Map
Visualize a charge-window distance budget as a conceptual radius diagram, with a road-distance ratio supplied by you. Use actual navigation and charging information for a journey.
Sources checked 9 October 2026. Example inputs are scenarios; use your own bill, equipment or trip measurements.
Your inputs
Use a named rating or your measured full-charge equivalent. The default is an illustrative 300-mile scenario.
This is your explicit assumption. No age, temperature or heat-pump multiplier is inferred.
Enter a ratio supported by your route measurement. Default 1 draws a mathematical outer bound, not a typical road estimate.
Your calculation
What the circles represent
The outer circle represents your distance budget divided by the road-to-straight-line ratio you enter. The inner circle divides that radius by two for an outward-and-return journey on the same route with no recharge. It includes the selected arrival reserve across the entire journey; the reserve is not silently removed from only one direction.
The drawing has no coordinates, roads, charger database or navigation API. It is a conceptual diagram centered on an arbitrary starting point. Rivers, mountains, restricted roads and route diversions can make road distance much greater than a straight line. There is no universal 10–30% road-distance uplift that makes every point within a circle reachable.
Use a measured route ratio
Road budget = baseline × factor ÷ 100 × (departure − reserve) ÷ 100
One-way diagram radius = road budget ÷ (road distance / straight-line distance)
For example, a 300-mile baseline, 100% factor, 80% departure and 10% reserve give 210.0 road miles. If your measured road-to-straight-line ratio is 1.2, the conceptual one-way radius is 175.0 miles and the return radius is 87.5 miles. The 1.2 is an illustrative route assumption, not a research-derived constant.
For a real journey, measure the full route in a navigation system. Divide its distance by the corresponding straight-line distance only if the diagram comparison is useful. A ratio from one destination may not fit other directions. Use the vehicle’s predicted arrival charge and verify charging stops independently.
A reserve is a budget, not a safety certification
Setting a reserve leaves that fraction of charge unspent in the arithmetic. It cannot guarantee a functioning charger, changing weather or an accessible detour. A higher reserve reduces the budget; no invented age-based capacity loss or automatic temperature correction is used. Tesla’s range guidance illustrates the difference between a rated distance display and vehicle consumption/trip predictions.
Questions and answers
Is this a geographic map of reachable roads?
No. It is a conceptual radius diagram without road routing, coordinates or live charger data. A destination inside a circle is not guaranteed to be reachable.
Does a zero reserve work?
Yes. Zero is accepted as a mathematical input rather than replaced with a hidden default. It is not a recommendation to arrive with an empty battery.
Why is the return radius half the one-way radius?
It assumes traveling the same route out and back without recharging. Both legs must fit the one charge budget while keeping the chosen reserve at the end.