How do I convert mpg to L/100km?

Divide 235.215 by the mpg value. For example, 30 mpg = 235.215 / 30 = 7.84 L/100km. Higher mpg means lower L/100km (better efficiency).

What is a good fuel efficiency rating?

For petrol cars, under 8 L/100km (over 29 mpg) is considered good. Hybrids often achieve 4–5 L/100km (47–59 mpg). Diesel engines are typically 15–20% more efficient than petrol.

Does driving speed affect fuel efficiency?

Yes, significantly. Most cars are most efficient at 50–80 km/h. At highway speeds above 100 km/h, aerodynamic drag increases rapidly, lowering fuel economy by 10–20%.

How is trip fuel cost calculated?

Trip cost = (Distance in km) × (L per 100km / 100) × (Fuel price per litre). For example, 500 km at 8 L/100km with fuel at $1.65/L = 500 × 0.08 × 1.65 = $66.

What is the difference between US and UK gallons?

A US gallon is 3.785 litres, while a UK (imperial) gallon is 4.546 litres. Use the driving system switch to choose the correct one for your car or market. UK mpg figures will be about 20% higher for the same car.

EVEEveryday Life

Fuel Efficiency

Convert between mpg and L/100km, or calculate the fuel cost for any trip. Enter your vehicle’s fuel consumption, trip distance, and fuel price for instant results.

Driving system

Choose the fuel and distance system you want to use.

What do you want to calculate?

Fuel economy

Trip distance(optional)

Fuel price(optional)

EUR/L

Try an example

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How It Works

Formula

\text{L/100km} = \dfrac{235.215}{\text{MPG}}

\text{MPG} = \dfrac{235.215}{\text{L/100km}}

\text{Trip cost} = \text{Distance} \times \dfrac{\text{L/100km}}{100} \times \text{Fuel price}

Where

$\text{MPG}$: Miles per gallon (US gallon by default; switch to UK in driving system)
$\text{L/100km}$: Litres consumed per 100 kilometres(L/100km)
$\text{Distance}$: Trip distance(km)
$\text{Fuel price}$: Fuel price per litre(currency/L)
$235.215$: Conversion constant for US mpg ↔ L/100km (use 282.481 when the driving system is set to UK)

Select a mode: convert mpg to L/100km, convert L/100km to mpg, or calculate trip fuel cost. For conversions, enter the fuel efficiency value. For trip cost, enter the consumption rate (L/100km), distance, and fuel price.

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