MPGe Converter
Convert electric-vehicle efficiency between kWh per 100 km, Wh per km, kilometres per kWh, miles per kWh and MPGe — the figures different countries and car makers quote.
Europe and Australia quote consumption per distance (kWh/100 km or Wh/km); the UK and US often quote distance per energy (mi/kWh); the US window sticker gives MPGe, miles per gallon-equivalent, on the basis that a US gallon of petrol holds 33.
How the mpge converter works
Europe and Australia quote consumption per distance (kWh/100 km or Wh/km); the UK and US often quote distance per energy (mi/kWh); the US window sticker gives MPGe, miles per gallon-equivalent, on the basis that a US gallon of petrol holds 33.7 kWh. They are all the same quantity: 15 kWh/100 km is 150 Wh/km, 6.67 km/kWh, 4.14 mi/kWh and 140 MPGe.
Formula: mi/kWh = 62.137 ÷ (kWh/100 km); MPGe = 33.7 × mi/kWh
Worked examples
| Inputs | kWh per 100 km | Note |
|---|---|---|
| 15 kWh per 100 km | 15 | 4.14 mi/kWh, 140 MPGe |
| 4 miles per kWh | 15.53 | 15.5 kWh/100 km |
| 120 MPGe | 17.45 | 17.4 kWh/100 km |
FAQFrequently asked questions
What is MPGe?
Miles per gallon equivalent — how far an EV goes on the energy in one US gallon of petrol, defined as 33.7 kWh. It lets the US window sticker compare EVs with petrol cars, though it says nothing about cost or emissions.
Why 33.7 kWh?
It is the lower heating value of a US gallon of petrol, 115,000 BTU, converted to kilowatt-hours. UK gallons are larger, and the UK does not use MPGe.
Which figure should I compare cars on?
Whichever your market uses — but note that kWh/100 km is consumption (lower is better) while km/kWh, mi/kWh and MPGe are efficiency (higher is better). The calculator shows all of them.
Does this include charging losses?
Trip-computer figures do not; the US EPA’s MPGe does (it is measured at the wall). Wall-to-wheel consumption is typically 10–15% higher than what the dashboard shows.
Where these figures come from
- ISO 4000 / ETRTO — tyre designation and dimensions — the width / aspect ratio / rim marking this page decodes
- UK Vehicle Certification Agency — the official UK fuel and emissions data
Last checked: September 2026. Tyre dimensions follow the ISO metric marking standard; engine formulas are the standard textbook forms.