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EV Range at Speed Calculator

Enter usable battery capacity, consumption at your cruising speed (Wh/km) and the speed to get range and driving time.

Result

395
3.3

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.

Worked example

A car has 75 kWh of usable battery and, at 120 km/h on the motorway, uses 190 Wh/km. Convert the battery to Wh: 75 × 1000 = 75,000 Wh. Range: 75,000 ÷ 190 = 394.7, shown as 395 km. Driving time at 120 km/h: 394.7 ÷ 120 = 3.3 hours, or roughly 3 hours 18 minutes. In practice you would plan the first charge stop well before that, since you will not want to arrive on 0 %.

Try this example →

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.

About this calculator

An electric car's real-world range depends heavily on driving speed, because aerodynamic drag rises with the square of speed, which pushes energy consumption (Wh/km) up sharply above about 100 km/h — meaning the range at a steady highway cruise can be noticeably lower than at city speeds or the manufacturer's combined-cycle rating. This calculator does not estimate that rise itself: you enter the consumption you expect at your cruising speed, for example from your trip computer. Range is usable battery capacity (kWh) ÷ consumption at that speed (Wh/km) × 1000, and driving time is range divided by the speed you enter; the speed does not change the range.

EV drivers planning a road trip use this calculation because charging stops need to be planned around real range at highway speed, not the optimistic combined-cycle figure on the window sticker — consumption typically quoted at 110–130 km/h can be 30–50% higher than at 90 km/h, which directly shortens usable range between charges.

Divide usable battery capacity by your consumption in Wh/km at the speed you plan to cruise, and you have the real range and how long you can drive at that speed, a sounder basis for charging stops than the sticker range.

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