Fuel economy is measured in miles per gallon (MPG) in the UK and US, and in litres per 100 kilometres (L/100km) in Europe. Our converter lets you switch between the two instantly. It also calculates the fuel cost for any journey based on your vehicle's fuel economy and the current fuel price. Enter your MPG or L/100km figure, the journey distance, and the fuel price per litre to see the total fuel cost. This is useful for comparing the running costs of different vehicles, planning a road trip budget, or understanding how much your commute costs.