Fuel Economy Converter: km/L, mpg, and L/100km units
This fuel economy converter changes values among km/L, L/100km, mpg (US), mpg (imperial), mi/L, and km/gal. It supports efficiency units, which measure distance per volume, and consumption units, which measure volume per distance. Because L/100km uses the inverse convention, conversion follows a reciprocal relationship; zero consumption is undefined and rejected.
The Fuel Economy Converter is a fuel economy converter for changing values among km/L, L/100km, mpg (US), mpg (imperial), mi/L, and km/gal. Choose the source and target units to see the converted figure, whether you are working with an efficiency measure or a consumption measure.
Fuel economy uses two conventions. Efficiency measures distance per volume, as in km/L and mpg; consumption measures volume per distance, as in L/100km. These conventions are inverses: for example, 8 L/100km is approximately 29.4 mpg (US). The L/100km conversion is non-linear, using the relationship km/L = 100 ÷ L/100km. Since zero consumption makes that calculation undefined, zero is rejected.
Converting between fuel economy units helps when comparing figures written in different measurement systems or presenting data in the units your audience expects. The tool includes both mpg (US) and mpg (imperial), as well as km/L, L/100km, mi/L, and km/gal, so select the specific unit you need rather than treating the two mpg units as interchangeable.
The converter runs entirely in your browser. Your input is processed on your device and is not uploaded, stored, or sent to a server. It has no server dependency, so after the page has loaded, conversions continue to work offline.
This browser-based tool is useful for developers, DevOps engineers, and anyone who needs to compare or communicate fuel economy values. Convert one figure or a set of values instead of working through each conversion by hand.
Step 1: Enter the fuel economy value you want to convert. You can convert a set of values at once instead of calculating each one by hand.
Step 2: Choose the source unit for your value, such as km/L, mpg, or L/100km.
Step 3: Choose the target unit you want to convert to, including mpg (US), mpg (imperial), mi/L, or km/gal.
Step 4: Read the converted figure and check that it is expressed in the target unit you selected.
Use case: Convert fuel economy measurements when the source and target systems use different units. This makes values easier to compare across regions.
Use case: Check a figure in the unit your audience actually uses, such as mpg (US), mpg (imperial), or L/100km.
Use case: Convert a set of values at once instead of rounding each one by hand. This can help when reviewing several fuel economy figures.
Use case: Compare efficiency values such as km/L or mpg with consumption values such as L/100km. The converter handles the inverse relationship between these conventions.
Use case: Prepare fuel economy figures for documentation or reports that use a different unit from the original measurement.
Use case: Review a converted value in another supported unit when checking or sharing fuel economy information.