Convert fuel economy between MPG, L/100km, and km/L instantly. Supports US MPG, UK MPG, and metric fuel economy standards.
The free Fuel Economy Converter instantly converts between Miles Per Gallon (MPG), Liters per 100 Kilometers (L/100km), and Kilometers per Liter (km/L). It supports both US and UK (Imperial) gallons so you can compare vehicles across different markets accurately.
Fuel economy ratings vary by country. The United States measures in MPG (US gallons), the United Kingdom uses MPG (Imperial gallons), and most of Europe and Canada report in L/100km. Japan and some Asian markets use km/L. These differences make cross-market vehicle comparisons confusing without a reliable converter.
Our converter uses the precise relationship: L/100km = 235.215 ÷ US MPG (or 282.481 ÷ UK MPG). Enter any value and see equivalents in all three systems instantly. Perfect for car buyers, travelers, and automotive enthusiasts.
By calculating this metric accurately, professionals gain actionable insights that support smarter work habits, more realistic scheduling, and improved work-life balance over time. Understanding this metric in precise terms allows professionals to set achievable targets, measure progress objectively, and continuously refine their approach to time and task management.
Comparing vehicles from different markets requires consistent fuel economy units. This converter eliminates manual math and prevents errors from confusing US and Imperial gallons. Data-driven tracking enables proactive schedule management, helping professionals protect focused work time and reduce the cognitive overhead of constant task-switching throughout the day. This quantitative approach replaces vague time estimates with concrete data, enabling professionals to plan realistic schedules and avoid the pattern of chronic overcommitment.
L/100km = 235.215 ÷ US MPG km/L = US MPG × 0.425144 UK MPG = US MPG × 1.20095 US MPG = 235.215 ÷ L/100km km/L = 100 ÷ L/100km
Result: 7.84 L/100km
30 US MPG = 235.215 ÷ 30 = 7.84 L/100km. That's also equivalent to 12.75 km/L and 36.03 UK MPG. A car rated 30 US MPG is considered good fuel economy for a mid-size sedan.
Fuel economy measurements evolved differently across regions. The US adopted miles per gallon during the 1975 CAFE standards. Europe standardized on L/100km because metric units were already prevalent and the inverse scale directly relates to consumption cost.
Because MPG and L/100km have an inverse relationship, the conversion is not linear. Improving from 10 to 20 MPG saves far more fuel than improving from 30 to 40 MPG. The L/100km scale makes this more intuitive since each unit of improvement represents the same fuel saving.
Lab-tested fuel economy (EPA, WLTP, NEDC) differs from real-world driving. Factors like temperature, terrain, driving style, and tire pressure all affect actual consumption. Use converter results as a baseline comparison, not a guaranteed prediction.
Divide 235.215 by the MPG value (US gallons). For example, 25 MPG = 235.215 ÷ 25 = 9.41 L/100km. For UK MPG, divide 282.481 by the MPG value instead.
US MPG uses the US gallon (3.785 liters), while UK MPG uses the Imperial gallon (4.546 liters). The same car will show a higher MPG number in UK units. Multiply US MPG by 1.201 to get UK MPG.
L/100km directly tells you how much fuel you'll use for a given distance, making cost estimation straightforward. It's also metric, consistent with the rest of European measurements.
Kilometers per liter (km/L) is the metric equivalent of MPG. It's widely used in Japan, India, and parts of Southeast Asia. Higher km/L means better fuel economy.
Yes, 7 L/100km (≈ 33.6 US MPG) is good for a mid-size gasoline sedan. Compact cars may achieve 5–6 L/100km, while full-size SUVs might use 10–14 L/100km.
Divide the fuel price per gallon by your MPG to get cost per mile. For metric: multiply L/100km by the price per liter, then divide by 100 to get cost per kilometer.