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Convert between km/L, MPG (US/UK), and L/100km.
Fuel Economy Converter is a free browser-based tool that helps you convert between km/l, mpg (us/uk), and l/100km. It is part of ToolsMonk's converters collection, so you can finish the job without downloading software, creating an account, or jumping between multiple websites.
This tool is especially useful for workflows such as comparing a car's economy quoted in mpg against one quoted in l/100km, translating fuel figures when buying or researching cars abroad, and converting between us mpg and uk mpg correctly. Because it runs directly in your browser, you can use it on desktop, tablet, or mobile while keeping the process fast and easy for one-off tasks as well as repeat work.
Fuel Economy Converter is also a strong fit for people searching for fuel economy, mpg, and km/l, because it combines a simple interface with instant results and privacy-friendly processing.
Enter a fuel-economy value in any unit
Select US or UK gallons where relevant
See the equivalent in the other units instantly
Use it to compare vehicles on a consistent basis
Converts between MPG, L/100km, and km/L fuel-economy units
Handles both US and UK (imperial) gallons
Instant conversion across units as you type
Clears up the confusion between 'higher is better' and 'lower is better' metrics
Runs in your browser — nothing is uploaded
Free, with no signup
Comparing a car's economy quoted in MPG against one quoted in L/100km
Translating fuel figures when buying or researching cars abroad
Converting between US MPG and UK MPG correctly
Understanding fuel efficiency across different regional standards
Fuel Economy Converter is a powerful free online tool available on ToolsMonk that helps you convert between km/l, mpg (us/uk), and l/100km. Whether you're a professional, student, or casual user, our fuel economy converter provides instant, accurate results right in your browser without requiring any software installation or account creation.
As part of our Converters collection, this tool is designed with simplicity and power in mind. All processing happens client-side, ensuring your data remains completely private and secure. The tool works seamlessly across all modern browsers on desktop, tablet, and mobile devices.
Fuel Economy Converter translates between the world's fuel-efficiency units — MPG, L/100km, and km/L — and handles the US-versus-UK gallon difference, so you can compare vehicles measured by different standards on a fair, consistent basis.
It untangles two classic confusions. First, direction: with MPG and km/L a higher number is better, but with L/100km a lower number is better, so eyeballing across units can mislead you completely. Second, the gallon: a UK imperial gallon is about 20% larger than a US one, so the same car posts a higher MPG in UK units despite identical real efficiency.
Because MPG and L/100km are inversely related, converting between them isn't a simple multiplication — which is exactly why a converter beats mental approximation, especially when the gallon type is also in play. Enter any value and it computes the equivalents correctly and instantly.
Knowing regional conventions helps too: the US uses US-gallon MPG, the UK uses imperial MPG, and much of the rest of the world uses L/100km or km/L. Conversion runs in your browser with nothing uploaded. Pair it with the other ToolsMonk automobile and converter tools when researching or comparing cars.
Watch the direction: higher MPG/km-L is better, but lower L/100km is better — don't compare across them by eye
Always confirm US vs UK gallon when comparing MPG figures; the ~20% difference is easy to miss
Convert everything to one unit before comparing cars from different regions
Common questions about this tool, its workflow, and what to expect before you use it.
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