Fuel Cost Calculator
Calculate the fuel cost of any trip by entering distance, fuel efficiency, and price per litre or gallon. Supports metric (L/100km) and imperial (MPG).
All calculations happen in your browser. No data is sent anywhere.
Trip Details
MPG ↔ L/100km Converter
Formula: L/100km = 235.214 ÷ MPG
How Fuel Cost Is Calculated
Imperial formula (MPG)
Fuel used (gallons) = Distance (miles) ÷ MPG. Trip cost = Fuel used × Price per gallon. Example: 300 miles at 30 MPG with fuel at $3.50/gal → 10 gallons × $3.50 = $35.00.
Metric formula (L/100km)
Fuel used (litres) = (Distance ÷ 100) × L/100km. Trip cost = Fuel used × Price per litre. Example: 500 km at 8 L/100km with fuel at $1.80/L → 40 L × $1.80 = $72.00.
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Open calculator →FAQ
How do I calculate fuel cost for a trip?
In imperial: Cost = (Miles ÷ MPG) × Price per gallon. In metric: Cost = (km ÷ 100) × L/100km × Price per litre. For example, 300 miles at 30 MPG with fuel at $3.50/gal = 10 gallons × $3.50 = $35.00.
What is MPG?
MPG (miles per gallon) measures how far a vehicle travels on one gallon of fuel. Higher MPG = better efficiency. The average new car in the US gets about 27–28 MPG combined. Hybrids typically achieve 40–60 MPG.
What is L/100km and how does it compare to MPG?
L/100km (litres per 100 km) measures litres consumed per 100 km driven. Lower is better. To convert: L/100km = 235.214 ÷ MPG. For example, 30 MPG ≈ 7.84 L/100km. The built-in converter above handles this automatically.
How can I save on fuel costs?
Maintain steady speeds, avoid aggressive acceleration and braking, keep tires properly inflated, remove excess cargo weight, use cruise control on highways, and compare prices at nearby stations. Combining multiple errands into one trip also reduces total distance driven significantly.