EV Range at Speed Calculator

How it is calculated

The tool divides the energy in the battery by the energy used per kilometre: range (km) = battery (kWh) × 1000 ÷ consumption (Wh/km). Driving time is hours = range ÷ speed (km/h). The consumption value is the one you type in: the tool does not model drag, so it does not change consumption with speed. Enter the Wh/km your car uses at that cruising speed, from the trip computer or a previous drive. Range is rounded to a whole kilometre and time to one decimal of an hour (3.3 h is about 3 h 18 min). The battery figure should be the usable capacity, not the gross capacity. All three values must be greater than zero, and two sanity limits apply: consumption below 5 Wh/km or a speed above 1,000 km/h gives no result. Temperature, hills, wind and the reserve you want to keep are not included.

Common mistakes

• Typing consumption in kWh/100 km. A car using 19 kWh/100 km uses 190 Wh/km; entering 19 is accepted and gives a range of 3,947 km, ten times too long.
• Using the consumption from the window sticker or a city drive while entering a motorway speed. The tool only divides, so the Wh/km must be the figure at the speed you enter.
• Entering the gross battery capacity. Usable capacity is lower, and the difference comes straight out of the range.
• Reading 3.3 hours as 3 hours 30 minutes. The time is decimal: 0.3 h is about 18 minutes.
• Treating the range as distance to drive from 100 % to 0 %. Most people plan charging stops with a buffer, so the practical distance between stops is shorter.