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Trip Fuel Cost Calculator

Calculate the fuel cost for a specific journey including cost per person and CO2 emissions.

Distance to calculate for

Current price of fuel

Your fuel economy in miles per gallon

Passengers

Return trip (double distance)

Distance to calculate for

How We Calculate This

The calculator works out fuel consumption and costs step by step:

  • Fuel needed = Distance / MPG (gives gallons) x 4.546 (converts to litres)
  • Total cost = Fuel litres x price per litre
  • Cost per person = Total cost / number of passengers
  • CO2 = Fuel litres x 2.31 kg (petrol emission factor)

Advanced options adjust MPG for city/motorway driving mix and cold start efficiency losses.

Frequently Asked Questions

Last updated: March 2026

All calculations are estimates. Actual figures may vary based on driving conditions, vehicle specifications, and other factors.