Fuel Cost Calculator
Calculate fuel cost for any trip, monthly expenses, and annual fuel budget. Supports both metric (km/L) and imperial (MPG) units.
Enter trip details and click Calculate
Trip fuel cost
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Fuel needed
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Cost per km
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Monthly cost
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Annual cost
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How is this calculated?
Metric formula:
Fuel needed (L) = Distance (km) / Efficiency (km/L)
Trip cost = Fuel needed × Price per litre
Monthly cost = Trip cost × Trips per month
Annual cost = Monthly cost × 12Imperial formula:
Fuel needed (gal) = Distance (miles) / Efficiency (MPG)
Trip cost = Fuel needed × Price per gallon
Monthly cost = Trip cost × Trips per month
Annual cost = Monthly cost × 12Calculation history
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FAQ
Frequently asked questions
How is fuel cost calculated?
What is a good fuel efficiency?
How do I convert km/L to L/100km?
How do I convert MPG to km/L?
How can I reduce my fuel costs?
How to Calculate Fuel Cost for a Trip
Planning a road trip or tracking your daily commute expenses? A fuel cost calculator makes it simple. The basic formula divides your trip distance by your vehicle's fuel efficiency, then multiplies by the price per litre or gallon. This gives you the exact fuel expense before you even leave.
Factors That Affect Fuel Cost
Your actual fuel consumption depends on driving conditions, not just the manufacturer's claimed mileage. City driving with frequent stops uses 20–30% more fuel than highway cruising. Air conditioning, carrying heavy loads, under-inflated tyres, and aggressive driving all increase consumption. Track your real-world mileage over several tanks to get an accurate efficiency number for this calculator.
Tips for Saving Fuel
The easiest fuel savings come from driving habits: maintain a steady speed, anticipate traffic to avoid hard braking, use cruise control on highways, and accelerate gently. Keep your vehicle maintained — clean air filters, proper tyre pressure, and regular servicing improve efficiency by 5–10%. For commuters, carpooling or combining errands into fewer trips reduces total kilometres driven.
Monthly and Annual Budgeting
Use the "trips per month" field to project ongoing costs. If your daily commute is 30 km each way (60 km round trip, 22 days/month), that is 1,320 km/month. At 12 km/L with fuel at $105/L, you are spending approximately $11,550 per month — $1,38,600 per year. Seeing this annual number often motivates people to explore more efficient vehicles or commute alternatives.