EV Range Calculator
How far an electric car goes on a charge from its battery size and energy consumption — city, mixed, motorway and winter — with the range left at a 20% reserve.
Range is usable battery energy divided by consumption.
How the ev range calculator works
Range is usable battery energy divided by consumption. Manufacturers quote gross battery size; 90–95% is usable. Consumption varies more than most people expect: around 150 Wh/km in town, 170 mixed, 200–220 at motorway speed, and 25–40% more in winter because of heating and cold-battery losses. The reserve row is the practical range, because nobody plans to arrive at 0%.
Formula: range = battery kWh × usable share ÷ (Wh/km ÷ 1,000)
Worked examples
| Inputs | Range on a full charge | Note |
|---|---|---|
| 60 kWh, mixed driving | 325 km | 325 km |
| Same car on the motorway | 263 km | 263 km |
| 77 kWh at 160 Wh/km | 457 km | 457 km |
FAQFrequently asked questions
Why is my real range less than the brochure?
Official test cycles (WLTP, EPA) run at modest speeds in mild weather. Motorway speed, cold, heating, roof racks, a full load and hills all raize consumption; a WLTP figure is typically 15–25% above real mixed driving.
What does winter do?
Cabin heating can draw 2–5 kW, the battery is less efficient when cold, and regenerative braking is limited until it warms — together 20–40% less range. Pre-conditioning while plugged in recovers part of it.
Why keep a 20% reserve?
Chargers can be occupied or broken, and the last few percent charge slowly and are hard on the battery. Planning to arrive at 10–20% is the norm for road trips.
How do I find my car’s consumption?
The trip computer shows it, usually as kWh/100 km or mi/kWh. Divide kWh/100 km by 10 for Wh/km; for mi/kWh, Wh/km = 621 ÷ (mi/kWh).
Where these figures come from
- ISO 4000 / ETRTO — tyre designation and dimensions — the width / aspect ratio / rim marking this page decodes
- US Environmental Protection Agency — fueleconomy.gov — the official US fuel economy database
Last checked: September 2026. Tyre dimensions follow the ISO metric marking standard; engine formulas are the standard textbook forms.