What is the Fuel Cost Estimator?
This fuel cost estimator works out how much fuel a trip needs and what it will cost. Choose metric (litres per 100 km) or US units (miles per gallon).
How to use the Fuel Cost Estimator tool
- Enter Distance, Fuel efficiency, Fuel price and Units.
- The result updates instantly as you type, or press Calculate.
- Use Try an example to see how it works, and Reset to start again.
Formula
Metric: fuel = distance × L/100 km ÷ 100. US: fuel = miles ÷ mpg. Cost = fuel × price.
Worked example
A 300 km trip at 7.5 L/100 km needs 22.5 litres, which costs 36.00 at 1.60 per litre.
Frequently asked questions
How do I find my fuel efficiency?
Divide fuel used by distance driven, times 100 for L/100 km, or divide miles by gallons for mpg.
Does driving style matter?
Yes. Speed, load and traffic all change consumption.
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Checked by Calcovate · Formula tested against worked examples · Updated 7 Nov 2026 · How we check our calculators.