Free Fuel Cost Calculator — Trip Cost by Distance Online
Calculate how much a trip costs in fuel — enter distance, fuel efficiency, and price per litre or gallon. Supports km and miles, free in browser.
Fuel Needed (litres)
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Total Trip Cost
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Cost per km
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How it works
Choose your units
Select km/litres or miles/gallons depending on your country.
Enter trip distance
Type the total distance of your journey in km or miles.
Enter fuel efficiency
Enter your vehicle's fuel consumption (L/100km or MPG).
Enter fuel price
Type the current fuel price per litre or gallon to get total cost.
Common use cases
Road trip planning
Estimate how much a long drive will cost in fuel before you leave.
Commute cost tracking
Calculate monthly fuel spend based on your daily commute distance.
Vehicle comparison
Compare running costs between two vehicles with different fuel efficiencies.
Business mileage
Estimate fuel expenses for business travel and reimbursement claims.
Frequently asked questions
How is fuel cost calculated?
Fuel needed = Distance ÷ Efficiency. For L/100km: litres = (distance × L/100km) ÷ 100. For MPG: gallons = distance ÷ MPG. Total cost = fuel needed × price per unit.
What is L/100km vs MPG?
L/100km measures litres consumed per 100 kilometres (lower = more efficient). MPG (miles per gallon) measures distance travelled per gallon of fuel (higher = more efficient).
Can I switch between km and miles?
Yes — use the toggle at the top to switch units. All values and labels update automatically.
What fuel price should I enter?
Enter the current pump price per litre (for metric) or per gallon (for imperial). Check a local fuel price tracker for today's rate.
Is this free?
Yes, completely free with no account needed.
Is my data stored?
No — all calculations run in your browser. Nothing is transmitted or stored.