Fuel Cost Calculator

A fuel cost calculatoris a tool that estimates the total cost of fuel for a given trip based on three inputs: the trip distance, the vehicle's fuel efficiency, and the current fuel price at the pump. The core formula is simple: Fuel Needed = Distance ÷ Efficiency, and Total Cost = Fuel Needed × Price per Unit. Our fuel cost calculator handles all common unit systems — kilometres and miles for distance, litres and US/UK gallons for volume, and L/100km, km/L, MPG (US), and MPG (UK) for efficiency — so you can calculate fuel costs accurately regardless of your country or vehicle type.

1. 1. Enter Your Trip Details: Input the trip distance in kilometres or miles, your vehicle's fuel efficiency in your preferred unit (L/100km, km/L, MPG US, or MPG UK), and the current fuel price per litre or gallon. All processing happens locally in your browser — your data never leaves your device.
2. 2. Instant Browser-Based Calculation: Click "Calculate Fuel Cost" and the tool converts all inputs to a common unit system, computes the fuel needed, multiplies by the price per litre, and displays the total cost along with cost per km, cost per mile, and CO₂ estimate.
3. 3. Review Results and Multi-Trip Table: View the total cost, fuel needed, and distance in both metric and imperial units. The multi-trip table shows costs for 1, 2, 5, 10, 20, and 30 trips so you can instantly see weekly or monthly fuel expenses.

• Total Fuel Cost: The main result — total money spent on fuel for the trip, in your chosen currency. Calculated as (distance ÷ efficiency) × price per litre, with all unit conversions handled automatically.
• Fuel Needed: The volume of fuel required for the trip, shown in your selected unit (litres, US gallons, or UK gallons) and also in litres for reference.
• Cost per km / Cost per mile: The fuel cost per unit of distance, useful for comparing routes, vehicles, or driving styles. Both metric and imperial values are shown simultaneously.
• CO₂ Emissions Estimate: An approximate CO₂ figure based on 2.31 kg of CO₂ per litre of petrol/gasoline burned. This is a standard average — diesel produces slightly more (2.68 kg/L) and LPG slightly less.

Different countries use different conventions for expressing fuel efficiency. L/100km (litres per 100 kilometres) is used in most of Europe, Australia, and Canada — lower is better. km/L (kilometres per litre) is common in Japan, India, and parts of Asia — higher is better. MPG (US) (miles per US gallon) is used in the United States, where one US gallon = 3.785 litres. MPG (UK) (miles per Imperial gallon) is used in the United Kingdom, where one Imperial gallon = 4.546 litres — so UK MPG figures are always higher than US MPG for the same vehicle. Our fuel cost calculator converts all of these to a common internal unit before computing the result.