How do I calculate fuel cost for a trip?

Fuel needed = distance ÷ mileage, then cost = fuel × pump price. Enter distance, mileage and price above for an exact trip, monthly and per-person cost.

Global · Everyday Tool

Fuel Cost Calculator

What will your trip cost? Fuel needed, per-km cost and monthly estimate.

Calculate total fuel cost from distance, mileage and pump price in any country — with km/miles, litre/gallon and mpg converters, round-trip and ride-split maths. Free, private, worldwide.

Your Trip

Distance (one way, km)

Trips per month

Fuel Efficiency

Mileage

Unit

Find it on your dashboard (average mileage) or your car's spec sheet. 15 km/L ≈ 6.7 L/100km ≈ 35 mpg (US).

Fuel Price & Sharing

Price

Per

Passengers (split cost)

Total fuel cost (one way)

$2,000.00

20.00 litres · $6.67/km · $8,000.00/mo

Fuel needed

20.0 L

Per km

$6.67

Each person

$2,000.00

Monthly estimate

$8,000.00 /month · 4 trips

5.28 US gallons per trip · $2,000.00 × 4.

How do you calculate fuel cost for a trip?

Fuel needed = Distance ÷ Mileage, then Cost = Fuel × Pump price. Example: 300 km at 15 km/L needs 20 litres; at $1.20/L the trip costs $24. Cost per km = total ÷ distance.

The calculator above converts km/L, L/100km and mpg automatically, and handles round-trips, monthly repeats and per-passenger splits for any country.

→ Fuel = distance ÷ efficiency · Cost = fuel × price
→ Per-km = total cost ÷ distance
→ Round-trip ×2 · per person ÷ passengers

How much fuel will my car use for 100 km?

100 ÷ your km/L: at 15 km/L you need ~6.7 litres. At 7 L/100km you need exactly 7 litres.

What is the cost per mile formula?

(Price per gallon ÷ MPG) = cost per mile. Multiply by trip miles for the total.

How Fuel Cost Is Calculated

Three numbers decide any trip's fuel bill: fuel needed = distance ÷ mileage, then cost = fuel needed × price. Everything else — round trips, monthly commutes, splitting with passengers — is multiplication on top of that one-trip cost. The calculator converts km/miles, litres/gallons and km/L, L/100km or mpg automatically.

Efficiency Units, Converted

If your car does	That equals	Per 100 km
20 km/L	47 mpg (US)	5.0 L
15 km/L	35 mpg (US)	6.7 L
12 km/L	28 mpg (US)	8.3 L
8 km/L	19 mpg (US)	12.5 L

Fuel Cost FAQs

How much fuel will my trip use?

Divide the trip distance by your mileage in matching units. 300 km at 15 km/L needs 20 litres. With L/100km figures, multiply instead: 300 km × 6.7 ÷ 100 = 20.1 litres.

How do I cut cost per kilometre?

Steady highway speed, correct tyre pressure and a serviced air filter typically save 10–15%. Splitting the ride divides the per-person cost directly — the calculator does this in the passengers field.

Does it work in my country?

Yes. Enter the price in your own currency per litre or per gallon, and distances in km or miles. All maths runs in your browser; nothing is uploaded.