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Fuel Cost Calculator
Enter your trip distance, your vehicle's fuel efficiency, and the current pump price to find out exactly what your journey will cost in fuel.
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Fuel needed
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Total cost
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How to Use This Calculator
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Enter your trip distance in kilometres or miles — use the ⚙️ settings icon to switch between metric and imperial
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2
Enter your vehicle's fuel efficiency — check your car's handbook for the official figure (L/100km for metric, MPG for imperial)
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3
Enter the current fuel price at the pump — per litre for metric, per gallon for imperial
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Your total fuel needed and trip cost appear instantly — adjust any value to recalculate on the fly
Frequently Asked Questions
Divide your distance by your fuel efficiency to find the fuel needed, then multiply by the price per unit. Metric example: 300 km ÷ 100 × 8 L/100km = 24 litres. At $1.85/L → total = $44.40. Use the calculator above to do this instantly.
L/100km means how many litres of fuel your car uses to travel 100 km. A lower number is better — 5 L/100km is very efficient, 8–10 L/100km is typical for a mid-size car, and 15+ is high consumption (e.g. large SUVs or 4x4s).
L/100km = 235.214 ÷ mpg. Example: 30 mpg → 235.214 ÷ 30 = 7.84 L/100km. To convert the other way: mpg = 235.214 ÷ L/100km.
A typical petrol car averages 7–10 L/100km (28–33 mpg). An efficient small car may achieve 5–6 L/100km. Hybrids often reach 4–5 L/100km. Your car's handbook or fuel economy label will give you the official figure to use here.
Maintain a steady highway speed — fuel efficiency peaks around 90–100 km/h for most cars. Keep tyres at the correct pressure, remove unnecessary weight (roof boxes, heavy luggage), use cruise control, and avoid hard acceleration. Filling up at cheaper stations rather than motorway services can also save a meaningful amount on longer trips.