Fuel Cost Calculator
Work out exactly how much your journey will cost in fuel. Enter your distance, vehicle efficiency, and current fuel price to get an instant breakdown — including cost per mile, litres used, and annual spending estimates. Compare petrol against diesel to find which saves you more.
UK average: 139.7p/litre
Enter your details above and click Calculate to see your results
How It Works
Our fuel cost calculator uses straightforward maths based on your vehicle's fuel efficiency and current fuel prices. No account needed, no data leaves your browser.
Enter Your Journey Details
Type in the distance you plan to drive (in miles or kilometres), choose your fuel type, and enter your vehicle's fuel efficiency rating. If you're not sure about your MPG, pick your car from our built-in lookup of popular UK models and we'll fill it in automatically. You can also switch between imperial and metric units at any time — the calculator handles all the conversions behind the scenes, so you'll always see accurate numbers regardless of which system you prefer.
Choose Your Calculation Mode
Select the mode that fits your needs. Single journey gives you the cost for a one-way trip. Return trip doubles the distance automatically. Annual cost mode takes your weekly mileage and projects it across an entire year, showing you monthly and yearly spending. The comparison mode lets you pit petrol against diesel for the same journey, revealing which fuel type works out cheaper for your specific driving pattern.
Review and Export Results
Your results appear instantly: total cost, litres of fuel consumed, and a breakdown of cost per mile and cost per kilometre. The calculator saves your inputs automatically, so you can return later without re-entering everything. When you need a record — for expense claims, budgeting, or fleet management — hit Export PDF to download a clean, print-ready summary with all your inputs, results, and a timestamp.
Why Use This Calculator
Built for UK drivers who want clear, reliable fuel cost estimates without the guesswork.
Accurate Estimates
Uses your actual MPG or L/100km rating with current UK fuel prices. Pre-loaded data for over 20 popular car models helps you get precise results without consulting your manual.
Instant Results
No loading screens or sign-up walls. Type your numbers, click Calculate, and see your fuel costs broken down immediately. Switching between modes and units is instantaneous.
Completely Private
Every calculation happens in your browser. We don't store your data on any server, don't require an account, and don't track your journeys. Your inputs are saved locally on your device only.
PDF Export
Generate a clean, print-friendly PDF of your results for expense reports, budget planning, or fleet management. The export includes all your inputs, the full results breakdown, and a timestamp.
Guides & Real-World Examples
Fuel Cost Per Mile Guide
Learn how to calculate and track your petrol costs per mile with step-by-step examples.
Petrol vs Diesel Costs
A detailed comparison of running costs to help you decide which fuel type is right for you.
Daily Commuter Scenario
See how a 30-mile daily commute adds up over a year and how to budget for it.
Family Road Trip
Plan fuel costs for a 500-mile family road trip with petrol vs diesel comparison.
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