Fuel Cost Calculator

Estimate the fuel used and cost for a trip. Enter the distance, your vehicle's efficiency, and the fuel price; pick the units (US or UK miles-per-gallon, L/100km, or km/L) and how the price is quoted (per litre or per gallon). The calculator works through litres as a common base so any efficiency unit pairs with any price unit. Runs entirely in your browser.

Distance (miles)

Efficiency (mpg)

Fuel price

Price unit

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Enter values to estimate trip cost.

Fuel used is computed in litres (a common base), then cost = litres × price-per-litre. For mpg modes distance is in miles and efficiency in miles per gallon; for L/100km and km/L, distance is in kilometres. Conversions: 1 US gallon = 3.785411784 L, 1 UK gallon = 4.54609 L. This estimates fuel cost only — it ignores traffic, idling, and varying real-world efficiency. Runs locally.