About Global Fuel Calculator

Global Fuel Calculator is an independent, free tool built to solve one problem properly: working out fuel consumption, fuel cost and trip cost, correctly, for whichever country and units you actually use.

Why this exists

Almost every country has its own way of talking about fuel efficiency. Some measure it in kilometres per litre, others in litres per 100 km, and others in miles per gallon — and even "miles per gallon" secretly means two different things depending on whether the gallon is American or British. On top of that, anyone planning a trip regularly needs to convert between these systems, whether that's checking a car's specification from another country or working out what a road trip will actually cost.

Rather than building a single calculator for one country and one unit system, this site was built after research into how these calculators are actually searched for and used across different countries, so that one properly engineered tool could cover fuel consumption calculators, fuel cost calculators, trip planning, and the unit converters between MPG, km/L and L/100km — all for free, and all built to be accurate rather than approximate.

How the calculations work

Every input is converted to a common internal basis — kilometres and litres — before anything is computed, and only converted back to your preferred units at the moment of display. Intermediate values are never rounded. The conversion constants used are the exact defined values: 1.609344 kilometres per mile, 3.785411784 litres per US gallon, and 4.54609 litres per imperial gallon. The two gallons are never treated as interchangeable anywhere in the code.

The conversion engine has an automated test suite covering every unit pair, including round-trip tests that convert a value out and back a thousand times over random inputs to confirm nothing drifts.

Who built it

Global Fuel Calculator is built and maintained by Syed Ali Murtajiz Bukhari, a computer science student and web developer based in Pakistan, hosting and running the site independently.

Privacy

Calculations run entirely in your browser. Nothing you type into a calculator is sent to a server, logged, or stored. See the privacy policy for the full detail.