1. What is the Fuel Cost Calculator?

The Fuel Cost Calculator UK AA helps estimate the cost of fuel for a journey based on distance, vehicle fuel efficiency (MPG), and current fuel prices. It uses the standard AA formula for accurate cost estimation.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( distance \) — Journey distance in miles
• \( mpg \) — Vehicle fuel efficiency in miles per gallon
• \( fuel\ price\ per\ litre \) — Current fuel price in pence per litre
• \( 4.546 \) — Conversion factor (litres to UK gallons)

Explanation: The formula calculates gallons needed, converts to litres, applies fuel price, and converts back to proper cost calculation.

3. Importance of Fuel Cost Calculation

Details: Accurate fuel cost estimation helps with journey planning, budgeting for trips, comparing vehicle efficiency, and managing travel expenses effectively.

4. Using the Calculator

Tips: Enter distance in miles, your vehicle's MPG rating, and current fuel price in pence per litre. The calculator uses AA's recommended default of 140p/litre (September 2025 average) but can be adjusted.

5. Frequently Asked Questions (FAQ)

Q1: Why use this specific formula?
A: This is the standard AA formula that properly handles the conversion between litres and UK gallons for accurate cost calculation.

Q2: What's the current average fuel price?
A: As of September 2025, AA reports average petrol prices around 140p per litre, but prices vary by location and time.

Q3: How do I find my vehicle's MPG?
A: Check your vehicle manual, use onboard computer readings, or calculate manually by tracking miles driven and fuel used.

Q4: Does this work for diesel vehicles?
A: Yes, simply use the current diesel price instead of petrol price in the calculation.

Q5: Are there any limitations to this calculation?
A: Actual fuel consumption may vary based on driving conditions, vehicle load, traffic, and driving style.