Trip fuel cost calculator
Enter the distance, your car’s fuel economy and the gas price to see how much fuel the trip needs and what it costs — one way, return, or split between everyone in the car.
Fuel needed
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Trip cost
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Per person
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Cost per 100 km
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The formula
cost = distance (km) × L/100 km ÷ 100 × price per litre. A 450 km trip in a car using 8.5 L/100 km at $1.55/L uses 38.3 L and costs about $59.
Getting realistic numbers
- Official ratings are measured under ideal conditions. Add 10–20% for highway speeds above 110 km/h, roof boxes or a full load.
- Canadian winters can raise consumption by 15–25% (cold engines, winter tires, heaters).
- Your car’s trip computer or a fill-to-fill calculation gives the most accurate economy figure.
Converting mpg or gallons? The mpg to L/100 km converter explains the maths. Check the weather on the way with the forecast.
Frequently asked questions
How do I convert mpg to L/100 km?
Divide 235.215 by the US mpg figure. 30 mpg is about 7.8 L/100 km.
Should I include the return trip?
Tick “Return trip” to double the distance.
How do I split gas money fairly?
Enter the number of people sharing the cost. Many carpools also add a little for wear and parking.