MPG (US)
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Equivalent fuel economy
Accurate conversion between L/100km and US miles per gallon for vehicles, fuel economy ratings, and car comparisons
Convert litres per 100km to US MPG instantly with precise calculations. Includes reverse MPG to L/100km conversion, km/L, imperial MPG, full formula reference, and real-world fuel economy reference tables for 2026.
Professional fuel economy conversion for vehicle comparisons, car buying, road trips, and emissions calculations across metric and imperial markets
Convert litres per 100 kilometres to US miles per gallon using the exact conversion constant: MPG (US) = 235.214583 ÷ L/100km. This constant is derived from the exact definition of the US gallon (3.785411784 litres) and the mile (1.609344 km). For example, 7 L/100km = 33.60 MPG (US). Our tool also outputs km/L and imperial MPG (UK) for a complete multi-unit fuel economy breakdown in one step.
Switch seamlessly between L/100km to MPG and MPG to L/100km conversion modes. Whether you are comparing a European or Australian vehicle's fuel rating (expressed in L/100km) with an American car's EPA MPG rating, or converting a US vehicle's MPG figure into L/100km for use in a metric country, both directions are handled instantly. The inverse relationship between these two units — where lower L/100km and higher MPG both mean better economy — is clearly displayed in every result.
Essential for comparing international vehicle fuel economy ratings, calculating running costs during overseas travel, interpreting Australian, European, or US new car review data, planning cross-border road trips, understanding fuel consumption for fleet management, and evaluating electric vehicle equivalent consumption figures in 2026. As global car markets increasingly share models across metric and imperial regions, L/100km to MPG conversion is one of the most practically useful everyday unit conversions for car buyers and drivers.
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Litres per 100 kilometres (L/100km) is the fuel consumption metric used in Australia, Canada, Europe, and most countries that have adopted SI units. It expresses how many litres of fuel a vehicle consumes to travel 100 kilometres. A lower L/100km figure means better fuel efficiency — a car rated 5.0 L/100km is more economical than one rated 10.0 L/100km. Modern fuel-efficient passenger cars typically achieve 5–8 L/100km, while hybrids and plug-in hybrids can reach 2–4 L/100km in combined driving cycles.
Miles per gallon (MPG) is the fuel economy measure used in the United States, expressed as the number of miles a vehicle can travel on one US gallon of fuel (1 US gallon = 3.785411784 litres). A higher MPG means better fuel efficiency — the opposite relationship to L/100km. The US EPA rates the average new vehicle at around 28–30 MPG combined. Because one unit measures volume per distance and the other measures distance per volume, the conversion between them uses an inverse (reciprocal) relationship: MPG (US) = 235.2146 ÷ L/100km.
7.0 L/100km = 33.60 MPG (US) = 40.35 MPG (UK) = 14.29 km/L — a typical mid-size sedan fuel economy rating
Use the reference table below for quick L/100km to MPG lookups. Values cover the full range of real-world vehicle fuel economy from highly efficient hybrids and small city cars to large SUVs, trucks, and performance vehicles. On mobile, a card layout is displayed for easy reading.
| L/100km | MPG (US) | MPG (Imperial) | km/L | Common Vehicle Reference |
|---|---|---|---|---|
| 2.0 L/100km | 117.61 MPG | 141.24 MPG | 50.00 km/L | Plug-in hybrid / EV equivalent |
| 3.0 L/100km | 78.40 MPG | 94.16 MPG | 33.33 km/L | Strong hybrid (e.g. Toyota Prius) |
| 4.0 L/100km | 58.80 MPG | 70.62 MPG | 25.00 km/L | Efficient hybrid / small diesel |
| 4.5 L/100km | 52.27 MPG | 62.77 MPG | 22.22 km/L | Small hybrid hatchback |
| 5.0 L/100km | 47.04 MPG | 56.49 MPG | 20.00 km/L | Efficient small car |
| 5.5 L/100km | 42.77 MPG | 51.36 MPG | 18.18 km/L | Small petrol hatchback |
| 6.0 L/100km | 39.20 MPG | 47.07 MPG | 16.67 km/L | Efficient mid-size car |
| 6.5 L/100km | 36.19 MPG | 43.46 MPG | 15.38 km/L | Mid-size sedan (good rating) |
| 7.0 L/100km | 33.60 MPG | 40.35 MPG | 14.29 km/L | Typical mid-size sedan |
| 7.5 L/100km | 31.36 MPG | 37.66 MPG | 13.33 km/L | Average new car (AU/EU) |
| 8.0 L/100km | 29.40 MPG | 35.31 MPG | 12.50 km/L | Mid-size wagon / crossover |
| 8.5 L/100km | 27.67 MPG | 33.23 MPG | 11.76 km/L | Small SUV |
| 9.0 L/100km | 26.13 MPG | 31.39 MPG | 11.11 km/L | Mid-size SUV |
| 10.0 L/100km | 23.52 MPG | 28.25 MPG | 10.00 km/L | Large SUV / people mover |
| 11.0 L/100km | 21.38 MPG | 25.68 MPG | 9.09 km/L | Large 4WD / pickup truck |
| 12.0 L/100km | 19.60 MPG | 23.54 MPG | 8.33 km/L | Heavy duty truck / large V8 |
| 15.0 L/100km | 15.68 MPG | 18.83 MPG | 6.67 km/L | Performance car / heavy 4WD |
| 20.0 L/100km | 11.76 MPG | 14.12 MPG | 5.00 km/L | High-performance sports car |
Unlike most unit conversions that use a simple multiplication factor, L/100km and MPG have an inverse (reciprocal) relationship — because one measures volume per distance and the other measures distance per volume. Here are the steps for any L/100km to MPG conversion in 2026:
Key L/100km to MPG conversions to remember: 5 L/100km = 47.0 MPG. 6 L/100km = 39.2 MPG. 7 L/100km = 33.6 MPG. 8 L/100km = 29.4 MPG. 9 L/100km = 26.1 MPG. 10 L/100km = 23.5 MPG. Remember: the conversion uses division by the magic constant 235.2146 — not multiplication.
The United States is one of very few countries still using MPG as its primary fuel economy standard — officially regulated by the EPA. Australia, Canada, all EU countries, Japan, and most of the world use L/100km or km/L. The US gallon (3.785 L) differs from the Imperial (UK) gallon (4.546 L), which is why UK MPG figures are always about 20% higher than US MPG for the same vehicle — a common source of confusion when comparing international car reviews.
A key advantage of L/100km over MPG is that it is a linear measure — a 1 L/100km improvement always saves the same amount of fuel regardless of starting point. Improving from 15→14 L/100km saves the same fuel as 6→5 L/100km over 100km. With MPG, improving from 15→16 MPG saves far more fuel than 45→46 MPG over the same distance. This non-linear property of MPG causes systematic misjudgement of fuel savings by consumers.
Modern fuel economy benchmarks in 2026: Small city cars — 4.5–6.5 L/100km (36–52 MPG). Mid-size sedans — 6.5–8.5 L/100km (27–36 MPG). Mid-size SUVs — 8.0–11.0 L/100km (21–29 MPG). Pickup trucks — 10.0–14.0 L/100km (17–24 MPG). Full hybrids — 3.5–5.5 L/100km (43–67 MPG). Plug-in hybrids (PHEV) — 1.5–3.5 L/100km on combined cycle. Battery EVs are rated as equivalent consumption (kWh/100km or MPGe).
Once you know L/100km, calculating annual fuel cost is straightforward: multiply L/100km by annual kilometres driven, divide by 100, then multiply by fuel price per litre. Example: 8 L/100km × 15,000 km ÷ 100 × $2.00/L = $2,400/year. Improving from 10 to 7 L/100km saves 300 litres per 15,000 km — equivalent to $600/year at $2.00/L. This is why even small improvements in L/100km produce significant real-world savings.
Fuel economy in L/100km is directly linked to CO₂ emissions. For petrol (gasoline), each litre burned produces approximately 2.31 kg of CO₂. For diesel, it is approximately 2.68 kg/litre. A car using 7 L/100km of petrol emits roughly 161 g CO₂/km. The EU mandates new passenger car average CO₂ emissions below 95 g/km — equivalent to approximately 4.1 L/100km of petrol or 42.1 MPG (US). Battery EVs have zero direct emissions but vary in well-to-wheel CO₂ depending on the electricity grid.
Battery electric vehicles use MPGe (miles per gallon equivalent) in the USA, where 33.7 kWh of electricity is defined as equivalent to 1 US gallon of petrol. A Tesla Model 3 Long Range rated at 130 MPGe equals approximately 1.81 L/100km equivalent, or 18.1 kWh/100km. In metric countries, EVs are rated in kWh/100km. Converting between L/100km equivalent and MPGe uses the same 235.2146 constant for the MPG portion of the calculation.
A critical point when converting fuel economy: the US gallon (3.785 L) and the Imperial (UK) gallon (4.546 L) are different units. This means 30 MPG US ≠ 30 MPG Imperial. 1 US MPG = 1.20095 Imperial MPG, so a car rated at 30 US MPG equals approximately 36 Imperial MPG. Conversely, a UK car advertised at 50 MPG equals only about 41.6 US MPG. Always check which gallon is being used when comparing fuel economy figures across international car reviews, especially for UK-spec and US-spec vehicles.
Official L/100km and MPG ratings from manufacturers and regulators (WLTP in Europe, EPA in the USA, ADR 81/02 in Australia) are measured under standardised laboratory test cycles and consistently underestimate real-world fuel consumption by 10–25%. Real-world driving at higher speeds, with air conditioning, with varied loads, and in stop-start traffic typically results in 15–20% higher L/100km than the official rated figure. When converting official figures for budgeting purposes, adding a 15–20% buffer to L/100km (or reducing MPG by 12–16%) gives a more realistic estimate of actual fuel costs.
Official fuel economy ratings for new vehicles are published by national regulators: the US EPA (fueleconomy.gov), the EU WLTP test cycle (published on manufacturer sites and new car labels), and Australia's Green Vehicle Guide. These ratings use standardised lab test cycles. Real-world consumption typically runs 10–20% higher. When comparing vehicles across regions, always convert to the same unit (L/100km or MPG) using this converter for a fair comparison.
More Unit Converters →Fuel consumption directly determines CO₂ output. Each litre of petrol burned produces approximately 2.31 kg CO₂; each litre of diesel produces approximately 2.68 kg CO₂. Converting L/100km to MPG is therefore not just about convenience — it is about understanding your vehicle's environmental footprint in internationally comparable terms. Governments worldwide set fleet-average CO₂ targets that directly translate to mandatory L/100km or MPG floors for new vehicle sales.
BTU to Joules →The conversion constant 235.214583 is derived from: 1 US gallon = 3.785411784 litres (exact, by US definition) and 1 mile = 1.609344 km (exact, international standard). These are both exact defined values, making the L/100km to MPG (US) conversion mathematically precise with no rounding uncertainty in the constant itself. The Imperial MPG constant is 282.481 (using the UK gallon of 4.54609 litres instead).
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