RAC Fuel Cost Calculator
Estimate how much fuel your journey will use and what it will cost.
Set to 1 if only the driver is paying.
What is an RAC fuel calculator?
An RAC fuel calculator helps you estimate the fuel needed for a journey and the likely total cost based on your vehicle's efficiency and current fuel prices. Whether you are planning a short commute, a weekend trip, or a long motorway drive, it gives you a quick reality check before you set off.
Instead of guessing, you can use distance, MPG (or litres/100 km), and pump price to get a practical budget figure. It is especially useful for family travel, work mileage claims, and ride-sharing where you need to split costs fairly.
How this calculator works
1) Convert all values into compatible units
To calculate fuel use correctly, distance and efficiency must match. This tool converts miles/kilometres and different economy formats into a common base so the final answer is accurate.
2) Estimate litres consumed
Once your distance and economy are aligned, the calculator estimates total litres burned. If you choose return trip, it doubles the distance before computing consumption.
3) Calculate total trip cost
Litres used are multiplied by fuel price per litre. You also get optional cost-per-mile and per-person split so you can budget or share expenses quickly.
When to use a fuel cost calculator
- Planning road trips and setting a realistic travel budget
- Comparing routes (faster route vs. cheaper route)
- Estimating weekly commuting costs
- Preparing reimbursement or mileage reports
- Splitting petrol costs with friends or colleagues
Tips to lower your fuel bill
- Maintain steady speeds and avoid harsh acceleration
- Check tyre pressure regularly
- Remove unnecessary weight from the vehicle
- Use route planning to avoid stop-start traffic
- Keep up with maintenance (filters, oil, alignment)
- Compare fuel stations before filling up
Example calculation
Suppose your one-way journey is 120 miles, your car averages 50 MPG (UK), and fuel costs £1.52 per litre.
- Fuel used: approximately 10.9 litres
- Total cost: approximately £16.57
- If 2 people split the trip: about £8.29 each
These numbers are estimates, but they are typically good enough for trip planning and budgeting.
Frequently asked questions
Is this the same as an official RAC tool?
This page is a replica-style educational calculator inspired by the same idea: estimate fuel usage and cost quickly.
Why might real fuel cost be different?
Real-world results vary due to traffic, weather, elevation, load, air conditioning use, driving style, and true vehicle efficiency on that day.
Should I use MPG or litres/100 km?
Use whichever your car displays. This calculator accepts both and converts automatically.
Final thought
A fuel calculator is a small tool that can make a big difference in budgeting. Even a rough estimate helps prevent surprises and supports smarter travel decisions.