Our UK fuel cost calculator helps you estimate the cost of any journey based on the distance, your vehicle's fuel efficiency (MPG or L/100km), and the current price of petrol or diesel. Whether you are planning a long road trip, calculating business mileage expenses, or comparing the running costs of different vehicles, this tool gives you an accurate fuel cost estimate. You can also use it to calculate the annual fuel cost of your daily commute, which is often one of the largest variable costs of car ownership.