Electric Vehicle Consumption Conversion Calculator
Written by Thierno Sadou Diallo, formula verified per our methodology • Last checked on 10/11/2026
An electric vehicle's consumption converts directly between its usage units: Wh/km = kWh/100km × 10, and km/kWh = 100 ÷ (kWh/100km). For 15 kWh/100km (an efficient electric city car), that's equivalent to 150 Wh/km, or about 6.67 km per kWh.
Explanation
An electric vehicle's energy consumption is expressed in several ways depending on context and country: kWh/100km is the standardized display unit in Europe, directly comparable in logic to the L/100km used for gasoline vehicles (the smaller the number, the more efficient the vehicle). Wh/km, simply a decimal-point shift from kWh/100km (multiplied by 10), is sometimes preferred because it gives round numbers for typical vehicles. km/kWh, the reciprocal of consumption, is often more intuitive for directly estimating range: with a 60 kWh battery and a consumption of 6.67 km/kWh, the theoretical range is about 400 km (see our electric vehicle range calculator for this full calculation). miles/kWh, used in English-speaking countries, is obtained by dividing km/kWh by 1.609344 (the exact kilometer-to-mile conversion factor). This calculator deliberately doesn't cover MPGe (miles per gallon gasoline equivalent) used in the United States, which introduces a gasoline-electricity energy-equivalence constant (33.7 kWh per gasoline-gallon equivalent, defined by the US Environmental Protection Agency): the units converted here all stay electric, without mixing two different energy types. To directly compare an electric cost to a gasoline cost, see instead our electric vs. gasoline cost per km calculator.
Example: an electric city car at 15 kWh/100km
Inputs
Consumption: 15 kWh/100km.
Calculation
Wh/km = 15 × 10 = 150 Wh/km. km/kWh = 100 ÷ 15 ≈ 6.6667. miles/kWh = 6.6667 ÷ 1.609344 ≈ 4.1425.
Result
This consumption is equivalent to 150 Wh/km, or about 6.67 km (or 4.14 miles) per kWh consumed.
Frequently asked questions
Why are there so many different units for the same consumption?
Each unit emphasizes a different use case: kWh/100km is the European regulatory standard, directly comparable to the L/100km used for gasoline vehicles; km/kWh and miles/kWh are more intuitive for estimating range from a known battery capacity; Wh/km simply avoids small decimal numbers. All these units measure exactly the same thing, just expressed differently.
Why doesn't this calculator include the American MPGe?
Because MPGe relies on an energy-equivalence constant (33.7 kWh per gasoline-gallon equivalent, defined by the US Environmental Protection Agency) that mixes two different energy types to allow comparison with gasoline vehicles. This calculator deliberately sticks to purely electric conversions, without introducing this additional equivalence assumption.
How do I use this result to estimate my real-world range?
Multiply the km/kWh you got by your battery's usable capacity (in kWh) to get a theoretical range under ideal conditions — see our electric vehicle range calculator for that direct calculation. Real-world range then varies with outdoor temperature, speed, driving style, and use of air conditioning or heating, which can noticeably increase the consumption shown here.