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Fuel Consumption Converter

Convert fuel economy between US mpg, Imperial mpg, liters per 100 km, and kilometers per liter using correct inverse formulas.

Convert instantly
Enter a value and choose the units. Your answer updates as you type.

Result

1.20094992721 Miles per Imperial gallon (mpg)

Quick reference
  • Miles per US gallon (mpg)standard scale
  • Miles per Imperial gallon (mpg)standard scale
  • Liters per 100 kilometers (L/100 km)standard scale
  • Kilometers per liter (km/L)standard scale

About the Fuel Consumption Converter

Fuel economy is commonly reported as distance per fuel (mpg or km/L) or fuel per distance (L/100 km). These forms are inverses, not linear scales: a vehicle that uses fewer liters per 100 km travels farther per gallon. This converter also distinguishes US and Imperial gallons, which produce different mpg values.

Results update as you type and reject zero or negative values because inverse fuel-economy formulas would be undefined or physically meaningless. For example, 8 L/100 km is about 29.4018 US mpg. For trip planning, combine the result with the Time Converter or Volume Converter, or use the existing Fuel Cost Calculator for a price estimate.

Frequently asked questions

What is the formula from L/100 km to US mpg?

US mpg = 235.214583 divided by L/100 km. The inverse relationship means better economy has a smaller L/100 km number.

Why are US and Imperial mpg different?

A US gallon is smaller than an Imperial gallon, so the same vehicle has a numerically higher Imperial mpg.

Can fuel consumption be zero?

No. Zero would imply infinite distance per fuel and makes inverse conversion undefined; the converter requires a positive value.

Take this calculation further

Browse the converters calculators collection for more tools in this subject.

For a related calculation, use Fuel Energy per Mass Converter to convert specific energy and fuel heating value between J/kg, kJ/kg, MJ/kg, calories per gram, and International BTU per pound. Alternatively, use Heat Transfer Coefficient Converter to convert convective heat transfer coefficients between W/(m²·K), kW/(m²·K), W/(cm²·K), and International Btu/(h·ft²·°F).