Fuel Economy Converter (MPG to L/100km) Formula

Understand the math behind the fuel economy converter (mpg to l/100km). Each variable explained with a worked example.

Use the Fuel Economy Converter (MPG to L/100km)

Formulas Used

Liters per 100 km

l100km = 235.215 / mpg

Kilometers per Liter

kml = mpg * 0.425144

Variables

VariableDescriptionDefault
mpgFuel Economy(MPG)30

How It Works

Fuel Economy Converter

Formulas

  • L/100km = 235.215 / MPG (US gallons)
  • km/L = MPG × 0.425144

    • Note: This converter uses US gallons. For Imperial (UK) gallons, the conversion constant is 282.481.

    Worked Example

    Convert 30 MPG to L/100km and km/L.

    mpg = 30
    1. 01L/100km = 235.215 / 30 = 7.84 L/100km
    2. 02km/L = 30 × 0.425144 = 12.7543 km/L

    Frequently Asked Questions

    How do you convert MPG to L/100km?

    Divide 235.215 by the MPG value to get liters per 100 kilometers. For example, 30 MPG = 235.215 / 30 = 7.84 L/100km.

    Is higher or lower L/100km better?

    Lower L/100km means better fuel economy. It is the inverse of MPG, where higher is better.

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