Liters per 100km Calculator

About the Liters per 100km Calculator

Liters per 100 kilometers (L/100km) is the standard fuel consumption metric used across Europe, Canada, Australia, and most of the world outside the United States. Unlike MPG, which measures distance per unit of fuel, L/100km measures fuel used per unit of distance — lower numbers mean better efficiency.

This calculator takes your distance driven in kilometers and the liters of fuel consumed to compute your exact L/100km figure. It also converts to km/L for convenience. Use it after each fill-up to monitor your vehicle's real-world fuel consumption.

Tracking L/100km is essential for budgeting fuel costs, comparing vehicles, and identifying when maintenance is needed. A consistent increase in consumption may signal mechanical issues that should be addressed promptly.

When This Page Helps

L/100km is the global standard for fuel consumption. This calculator gives you an accurate, real-world measurement based on your actual driving. Lower numbers mean you're using less fuel, making it intuitive for cost comparisons between vehicles and driving conditions.

How to Use the Inputs

1. Fill your tank completely and record the odometer in km.
2. Drive normally until you need to refuel.
3. Fill the tank again and record the liters added.
4. Record the new odometer reading.
5. Enter the kilometers driven and liters used.
6. Read your L/100km result.

Example Calculation

Tips & Best Practices

• Always refuel to full for consistent measurements.
• Average your results over several fill-ups for accuracy.
• City driving typically uses 20–40% more fuel than highway.
• Smooth, gentle acceleration keeps L/100km low.
• Check tire pressure regularly — under-inflation increases consumption.
• Air conditioning can add 0.5–1.0 L/100km in hot weather.
• Keep windows closed at highway speeds to reduce aerodynamic drag.

Understanding L/100km

L/100km measures how many liters of fuel your vehicle consumes to travel 100 kilometers. It's the inverse approach to MPG — instead of distance-per-fuel, it measures fuel-per-distance. This makes fuel cost calculations straightforward: multiply L/100km by fuel price, then divide by 100.

L/100km vs. MPG

The key difference is that L/100km is a consumption metric (lower is better) while MPG is an efficiency metric (higher is better). L/100km is mathematically more useful because the relationship between consumption and cost is linear, while MPG creates a misleading curve.

Typical Consumption by Vehicle Type

Subcompact cars: 4–6 L/100km. Compact sedans: 5–8 L/100km. Mid-size sedans: 6–9 L/100km. Full-size SUVs: 10–15 L/100km. Sports cars: 10–18 L/100km. Hybrid vehicles: 3–5 L/100km. Electric vehicles: 0 L/100km (use kWh/100km instead).

Tips for Reducing Consumption

Maintain steady speeds using cruise control, avoid rapid acceleration and hard braking, keep tires at recommended pressure, remove roof racks when not in use, and plan routes to avoid congestion. Regular maintenance including oil changes and air filter replacements also helps.

Frequently Asked Questions

• What is a good L/100km?

  Small cars typically achieve 5–7 L/100km, mid-size sedans 7–9 L/100km, SUVs 9–13 L/100km, and performance cars 12+ L/100km. Hybrids can drop below 4 L/100km. Lower is always better for fuel economy.

• How do I convert L/100km to MPG?

  Divide 235.215 by the L/100km figure. For example, 7.0 L/100km = 235.215 / 7.0 = 33.6 MPG (US). For UK imperial gallons, divide 282.481 by L/100km instead.

• Why is L/100km better than km/L?

  L/100km is linear for fuel cost comparisons. Improving from 10 to 8 L/100km saves the same amount of fuel as improving from 8 to 6.4 L/100km. With km/L, the relationship is non-linear, making comparisons less intuitive.

• Does altitude affect L/100km?

  Yes. At higher altitudes (above 1,500 m), engines may use slightly more fuel because the thinner air reduces combustion efficiency. Turbocharged engines are less affected. Going downhill at altitude can temporarily improve consumption.

• How does weather affect fuel consumption?

  Cold weather can increase consumption by 15–25% for short trips due to cold engine operation and winter fuel blends. Hot weather with air conditioning adds 5–15%. Mild temperatures (15–25°C) typically produce the best fuel economy numbers.

• What causes high L/100km readings?

  High readings can indicate aggressive driving, city congestion, under-inflated tires, clogged air filters, engine problems, excess vehicle weight, or aerodynamic accessories like roof boxes. A sudden increase warrants a mechanical inspection.