MPG Calculator UK
Our free UK MPG calculator works out your vehicle's fuel efficiency in miles per gallon or litres per 100km. Enter the distance driven and fuel used to instantly see how economical your car is — essential for managing UK motoring costs.
Fuel Efficiency
Metric
9.3 L/100km
Rating
High Usage
How MPG and Fuel Efficiency Are Calculated
This calculator computes fuel efficiency in two ways. MPG (miles per gallon): MPG = Miles Driven ÷ Gallons of Fuel Used. L/100km (European standard): L/100km = (Litres Used ÷ Kilometres Driven) × 100. Inputs: distance (miles or km) and fuel quantity (litres or gallons). Outputs: MPG value and L/100km figure, with a comparison to average UK fuel efficiency benchmarks.
Frequently Asked Questions
How does the UK MPG Calculator work?
Our UK mpg calculator uses standard automotive formulas to compute your result based on the input values you provide. Enter your vehicle data and see your result instantly — no manual calculation required.
Is this MPG Calculator suitable for both petrol and diesel vehicles?
Yes. Our mpg calculator works for petrol, diesel, hybrid, and electric vehicles where applicable. Select the relevant fuel type or input method from the options provided.
Does this MPG Calculator use UK miles or European kilometres?
Our mpg calculator supports both UK miles and European kilometres. You can switch between units freely, and all results are displayed in both measurement systems where relevant.
Is this UK MPG Calculator free?
Yes. Like all tools on CalcMax, the mpg calculator is completely free to use. No account or sign-up is required. It works on all devices including UK-based mobile and desktop browsers.
How accurate are the results from this MPG Calculator?
Our mpg calculator provides accurate estimates based on the values you input. Real-world results may vary due to driving conditions, tyre pressure, load, and road type. For precise figures, consult your vehicle manufacturer's specifications.