L/100km to MPG (UK) Converter
Instantly convert fuel consumption from litres per 100 kilometres to UK Imperial Miles per Gallon. Perfect for comparing vehicle efficiency across different regions.
Convert L/100km to UK MPG
Enter your vehicle’s fuel consumption in litres per 100 kilometres. The calculator instantly works out the equivalent UK Imperial Miles per Gallon (MPG), plus the US MPG for global comparison.
Fuel Consumption Converter
Get instant, accurate MPG figures from metric L/100km data.
Understanding Fuel Metrics
Key concepts for comparing vehicle efficiency
The L/100km Standard
Litres per 100km is the standard metric measurement used in Europe, Canada, and Australia. It shows exactly how much fuel is burned to travel a fixed distance, making cost calculations straightforward.
Imperial vs. US Gallons
The UK uses the Imperial gallon (4.546 litres), while the US uses the US liquid gallon (3.785 litres). Because the UK gallon is ~20% larger, UK MPG figures will always be higher than US MPG for the same car.
Real-World vs. Official Figures
Manufacturer WLTP or NEDC figures are tested in controlled environments. Real-world L/100km or MPG will vary based on driving style, traffic, vehicle load, and weather conditions.
Km per Litre (km/L)
Another common metric, especially in Asia, is kilometres per litre. It is the direct inverse of L/100km (100 ÷ L/100km). Higher km/L means better efficiency.
Common L/100km to MPG Conversions
Standard fuel consumption conversions. Use this as a quick lookup to compare metric and imperial efficiency ratings.
| Litres / 100km | UK MPG (Imperial) | US MPG | Efficiency Rating |
|---|---|---|---|
| 3.0 L/100km | 94.2 MPG | 78.4 MPG | Excellent (Hybrid / Small EV range extender) |
| 4.0 L/100km | 70.6 MPG | 58.8 MPG | Very Good (Modern diesel / efficient hybrid) |
| 5.0 L/100km | 56.5 MPG | 47.0 MPG | Good (Modern petrol hatchback) |
| 6.0 L/100km | 47.1 MPG | 39.2 MPG | Average (Standard family car) |
| 7.0 L/100km | 40.4 MPG | 33.6 MPG | Moderate (Older petrol / small SUV) |
| 8.0 L/100km | 35.3 MPG | 29.4 MPG | Below Average (Larger SUV / performance car) |
| 10.0 L/100km | 28.2 MPG | 23.5 MPG | Poor (Large 4×4 / heavy traffic driving) |
| 12.0 L/100km | 23.5 MPG | 19.6 MPG | Very Poor (High-performance / commercial vehicle) |
Fuel Conversion FAQ
Answers to the most frequently asked questions about fuel consumption metrics and conversions.
To convert L/100km to UK MPG, divide 282.48 by the L/100km value. For example, 6.0 L/100km is equal to 47.1 UK MPG (282.48 ÷ 6.0 = 47.08). The constant 282.48 is derived from the number of kilometres in a mile (1.60934) and the number of litres in an Imperial gallon (4.54609), multiplied by 100.
The UK (Imperial) gallon is larger than the US liquid gallon. One Imperial gallon equals 4.546 litres, while a US gallon equals 3.785 litres. Therefore, a UK MPG figure will always be approximately 20% higher than the US MPG figure for the exact same vehicle and driving conditions.
Yes. Litres per 100km measures how much fuel is consumed to travel a fixed distance. A lower number means the vehicle uses less fuel and is therefore more fuel-efficient. This is the inverse of MPG, where a higher number indicates better efficiency.
L/100km is the standard metric measurement for fuel consumption in Europe, Canada, Australia, and many other regions. It provides a linear scale of fuel consumption, making it mathematically easier to calculate fuel costs, estimate range, and compare the efficiency of different vehicles directly.
To convert L/100km to km/L, simply divide 100 by the L/100km figure. For example, if your car uses 8.0 L/100km, it travels 12.5 km per litre (100 ÷ 8.0 = 12.5). This metric is commonly used in Japan and some other Asian countries.