How do I calculate fuel cost for a trip?

Multiply fuel used by price per unit. Fuel used = (distance ÷ 100) × L/100 km for metric, or distance ÷ MPG for US gallons.

What is the difference between L/100 km and MPG?

L/100 km is litres consumed per 100 kilometres (lower is better). MPG is miles per gallon (higher is better). This tool accepts either.

Does this include tolls or wear?

No. It estimates fuel only. Add tolls, parking, and maintenance separately for a full trip budget.

Are US and imperial gallons the same?

This calculator uses US gallons (3.785 L). UK imperial gallons are larger; convert before using MPG figures from UK sources.

Is my data sent to a server?

No. All calculations run locally in your browser. Nothing is stored or transmitted.

How accurate is the estimate?

It uses the efficiency figure you provide. Real-world consumption varies with speed, load, weather, and driving style.

Fuel Cost Calculator

Plan a road trip or commute budget by entering distance, your vehicle's fuel efficiency, and the current fuel price. Supports kilometres or miles and litres or gallons. Results update instantly in your browser.

Trip distance

Distance unitFuel economy

Litres per 100 kmEconomy unitFuel price

Price unit

Total trip cost

$49.50

Fuel needed (Litres)

30.00 L

Cost per km

$0.12

Quick answer

Trip fuel cost equals fuel used multiplied by price per unit. For metric: litres = (distance km ÷ 100) × L/100 km, then cost = litres × price per litre. For imperial: gallons = miles ÷ MPG, then cost = gallons × price per gallon.

Informational only; verify critical results independently.

How to use

Enter your total trip distance and choose kilometres or miles.
Enter your vehicle fuel efficiency as L/100 km or MPG (US).
Enter the current fuel price and choose per litre or per gallon.
Read the total trip cost, fuel needed, and cost per km or mile.
Use Copy on any result card to paste the value elsewhere.
Change units or numbers anytime—results update as you type.

Examples

400 km at 7.5 L/100 km with fuel at $1.65/L → about 30 L and $49.50 total
300 miles at 30 MPG with gas at $3.50/gal → 10 gallons and $35.00
Daily 50 km commute at 6 L/100 km and $1.80/L → about $5.40 per day
Weekend 200-mile drive at 28 MPG and $3.20/gal → roughly 7.14 gal and $22.86
Compare two cars: same 500 km trip, 5.5 vs 8.5 L/100 km at $1.70/L
Budget a rental return: 150 km, 9 L/100 km, diesel at €1.55/L

FAQ

How do I calculate fuel cost for a trip?: Multiply fuel used by price per unit. Fuel used = (distance ÷ 100) × L/100 km for metric, or distance ÷ MPG for US gallons.
What is the difference between L/100 km and MPG?: L/100 km is litres consumed per 100 kilometres (lower is better). MPG is miles per gallon (higher is better). This tool accepts either.
Does this include tolls or wear?: No. It estimates fuel only. Add tolls, parking, and maintenance separately for a full trip budget.
Are US and imperial gallons the same?: This calculator uses US gallons (3.785 L). UK imperial gallons are larger; convert before using MPG figures from UK sources.
Is my data sent to a server?: No. All calculations run locally in your browser. Nothing is stored or transmitted.
How accurate is the estimate?: It uses the efficiency figure you provide. Real-world consumption varies with speed, load, weather, and driving style.

Formula / Method

Metric: litres = (distance km / 100) × L/100 km; cost = litres × price per litre. Imperial: gallons = miles / MPG; cost = gallons × price per gallon. Cost per distance = total cost / distance.

Assumptions & Limitations

Assumes constant efficiency and price for the whole trip. Does not model elevation, traffic, or partial fills. Results are estimates for planning—not quotes from fuel stations.

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Last updated: 2026-07-08

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