Calculadora de Consumo de Combustível
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
km/L = distância / litros; L/100km = 100 / (km/L)
About this calculator
The fuel consumption calculator helps you find out your vehicle's efficiency. Enter the distance traveled (in km) and the amount of fuel filled (in liters) to get consumption in km/L and L/100km. The first measure is common in Brazil, while the second is used internationally.
The calculation is simple: km/L = distance / liters, and L/100km = 100 / (km/L). For example, if you drove 300 km and filled 25 liters, consumption is 12 km/L (300/25) and 8.33 L/100km (100/12). This shows how many kilometers you get per liter or how many liters you spend per 100 km.
Use this tool to monitor your car's efficiency, compare fuels (gasoline, ethanol, diesel) or plan trips. It is useful for drivers who want to save fuel or identify mechanical issues, such as very high consumption. Record data after each refueling to track the average over time.
Caution: for accurate results, fill the tank to the same point each time and note the distance traveled since the last refueling. Consumption may vary with traffic, vehicle load, and driving style. This calculator provides only instant consumption, not the overall average.
Frequently asked questions
How do I calculate my car's fuel consumption?
Note the distance traveled since the last refueling and the liters filled. Divide the distance by the liters to get km/L, or use the calculator to do it automatically.
What is the difference between km/L and L/100km?
km/L shows how many kilometers you drive per liter of fuel. L/100km shows how many liters you spend to travel 100 km. The higher the km/L, the better the efficiency.
Can I use the calculator for ethanol and gasoline?
Yes, the calculator works for any fuel. Simply enter the distance and the liters filled, regardless of fuel type.
What does very high consumption mean?
High consumption (low km/L) may indicate problems such as underinflated tires, dirty filter, engine misadjustment, or excess weight. Compare with your car's average to identify anomalies.
Do I need to fill the tank every time to use the calculator?
It is not mandatory, but for better accuracy, fill the tank to the same point each time. This avoids errors caused by variations in the tank level.