Fuel & Transportation
Calculate the fuel cost for your trip based on distance, fuel efficiency, and local fuel prices.
Distance Unit
Efficiency Unit
One-Way Trip Cost
$35.00
Fuel cost is calculated as: Fuel Needed × Fuel Price. Fuel Needed = Distance ÷ Fuel Efficiency. All calculations use live input.
A fuel cost calculator estimates the fuel expense for a journey based on three inputs: distance travelled, vehicle fuel efficiency (measured in miles per gallon or kilometres per litre), and the local price of fuel per unit. The calculation is straightforward: divide distance by efficiency to find fuel needed, then multiply by price. Inputs swap between imperial (miles, MPG, gallons) and metric (kilometres, km/L, litres), and currency can be USD, EUR, GBP, or INR.
The calculator accepts distance, fuel efficiency, and fuel price. It normalises units internally—if you mix miles with km/L, it converts one to match the other (miles to km or vice versa) before dividing. The result is fuel quantity needed; multiply by price to get cost. A bonus stat shows cost per mile or kilometre, helping you budget recurring routes. Round-trip cost doubles the one-way figure.
Fuel Needed = Distance ÷ Efficiency | Trip Cost = Fuel Needed × Fuel Price per Unit | Round-Trip Cost = Trip Cost × 2Distance divided by efficiency yields fuel volume needed (because efficiency is distance-per-fuel). Multiplying by price gives absolute cost. Round-trip assumes you return via the same route. Cost-per-distance is fuel-price divided by efficiency, showing marginal cost for each mile or kilometre.
| Input | Result | Notes |
|---|---|---|
| A 300-mile trip in a 30-MPG car at $3.50/gallon | 10 gallons × $3.50 = $35 one-way | Round-trip would cost $70. This typical sedan on a highway journey represents modest fuel cost. |
| A 500-km trip in a 15 km/L car at €1.80/litre | 33.3 litres × €1.80 = €59.94 one-way | This mid-range efficiency car in Europe (higher fuel price than US) shows how price variance affects total cost. |
| A 100-mile city commute in a 20-MPG SUV at $4.00/gallon | 5 gallons × $4.00 = $20 one-way | Lower efficiency and higher price per gallon than the first example; city driving worsens real-world efficiency further. |
Manufacturer efficiency ratings are lab-tested under ideal conditions; real-world driving (traffic, weather, load, driving style, road grade) reduces efficiency 10–20%. Use your car's trip computer average over several tanks for accuracy.
Not directly; this tool calculates fuel cost only. Add tolls, parking, and maintenance separately to get total trip cost.
Estimate a blended efficiency from your trip computer (e.g. 'highway 35 MPG, city 22 MPG, blended ~28 MPG') and use that. The calculator averages the input, not the route.
No; it uses a single fuel price. For road trips across regions, break the journey into segments and calculate each separately with local prices.
Ask your dealer, check the window sticker or manual, or use a fuel economy app (Fuelly, Waze) over several fill-ups. If you have consumption in L/100km, divide 100 by that figure to get km/L.
Not directly; EVs are rated in kWh/100km or MPGe (miles per gallon equivalent). Use an EV-specific electricity cost calculator instead.