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Petrol Cost Calculator

Estimate your fuel cost for a trip or period based on distance, fuel efficiency and petrol price.

Your Details

Overview

Use this Petrol Cost Calculator to estimate how much a journey may cost in fuel based on your distance, vehicle fuel efficiency, petrol price and the number of passengers sharing the cost. It is useful for trip planning, commuting estimates and comparing travel budgets.

How it works

The calculator estimates fuel use by dividing the journey distance by your vehicle's miles per gallon figure. It then converts the result from imperial gallons to litres and multiplies that amount by the petrol price per litre. If you enter more than one passenger, it also shows an equal fuel-cost split per person.

How to use this calculator

  1. 1Enter the total distance you plan to drive.
  2. 2Add your vehicle's fuel efficiency in miles per gallon.
  3. 3Enter the petrol price per litre.
  4. 4Set the number of passengers if you want to split the cost.
  5. 5Review the estimated petrol cost, fuel needed and cost per person.

Example Calculation

Distance

150

Fuel Efficiency

45

Petrol Price

$2

Number of Passengers

3

Estimated Petrol Cost

$24.25

For a 150-mile trip at 45 mpg with petrol at £1.60 per litre, the estimated petrol cost is about £24.24, using roughly 15.15 litres. Split between 3 passengers, that is about £8.08 each.

Frequently asked questions

What does this petrol cost calculator estimate?

It estimates the fuel cost for a trip using your distance, fuel efficiency and petrol price.

Does this calculator use mpg or litres per 100 km?

This version uses miles per gallon and converts the result into litres to match petrol prices entered per litre.

Is the fuel cost result exact?

No. It is an estimate based on steady fuel efficiency and a fixed fuel price.

Does the calculator include return journeys?

Only if you include the full round-trip distance in the distance field.

Can I split the petrol cost between passengers?

Yes. Enter the total number of passengers to see an equal cost per person.

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Assumptions and warnings

Assumptions

  • This calculator assumes your fuel efficiency stays consistent throughout the journey.
  • Petrol price is assumed to remain the same for all fuel bought for the trip.
  • The calculation uses imperial mpg and converts it to litres.
  • Results are estimates and do not include tolls, parking, servicing or other travel costs.