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EV Range Calculator Guide
The range on the dashboard assumes ideal conditions you'll rarely have. This EV range calculator adjusts for cold, speed, and climate control so you can plan a trip on a number you can actually trust.
Range = usable battery (kWh) × efficiency (miles per kWh), then adjusted for temperature, speed, and heating or air conditioning — the three things that move the number most.
How Far Can My EV Actually Go?
A 75 kWh battery at 90% charge holds 67.5 usable kWh. At 3.5 miles per kWh in mild weather that's about 236 miles. Take the same car to 20°F, drive it at 80 mph with the heater on, and realistic range falls to roughly 139 miles — a 41% drop from the same battery.
Cold Is the Biggest Range Killer
Below freezing, expect to lose around 25%. Two things happen at once: the battery's chemistry is less efficient when cold, and cabin heating draws serious power because there's no waste engine heat to borrow. Preconditioning the car while it's still plugged in helps a lot, since it heats the cabin on grid power rather than battery.
Speed Matters More Than in a Petrol Car
Aerodynamic drag rises with the square of speed, so 80 mph is dramatically thirstier than 65. EVs are especially sensitive because they have no gearbox efficiency sweet spot to fall back on. Dropping 10 mph on a motorway run is often the difference between one charging stop and two.
Always Leave a Buffer
Never plan to arrive at 0%. Aim for 10% left, which protects you against a charger being broken or occupied when you get there. Headwinds, hills, roof boxes, and a fully loaded car all cut into range too — none are in the dashboard estimate.
These are planning estimates based on typical adjustment factors. Real range varies with the specific vehicle, tyres, terrain, load, and driving style — always leave margin on a long trip.
Related: EV Charging Cost Calculator, Fuel Cost Calculator, and Gas Mileage Calculator.
Frequently Asked Questions
How do I calculate my EV's range?
Multiply usable battery capacity in kWh by your efficiency in miles per kWh, then adjust down for cold, high speed, and climate control use.
How much range do EVs lose in cold weather?
Roughly 25% below freezing, because battery chemistry is less efficient when cold and cabin heating draws significant power.
Does driving faster reduce EV range?
Yes, considerably. Aerodynamic drag rises with the square of speed, so sustained 80 mph driving can cut range around 15% against 65 mph.
How much charge should I leave as a buffer?
Plan to arrive with about 10% remaining, which covers a charger being broken, occupied, or further than expected.
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