General
Gas Mileage Calculator
Calculate your vehicle's fuel efficiency by entering the distance traveled and fuel consumed. Track your MPG or km/L to monitor fuel consumption.
Enter values to calculate gas mileage
Related to Gas Mileage Calculator
The Gas Mileage Calculator helps you determine your vehicle's fuel efficiency by calculating the distance traveled per unit of fuel consumed. This calculator supports both imperial (miles per gallon - MPG) and metric (kilometers per liter - km/L) measurements, making it useful for drivers worldwide. It also provides the increasingly common liters per 100 kilometers (L/100km) measurement used in many countries.
Calculation Method
The calculator uses the basic formula of dividing the distance traveled by the amount of fuel consumed. For MPG, it divides miles by gallons. For km/L, it divides kilometers by liters. For L/100km, it uses the formula: 100 ÷ (km/L). The calculator automatically handles all necessary unit conversions to ensure accurate results regardless of your input units.
Unit Conversions
The calculator performs these conversions: 1 mile = 1.60934 kilometers, 1 gallon = 3.78541 liters. This allows you to input your measurements in your preferred units while still getting results in all common fuel efficiency formats.
The calculator provides three different ways to understand your vehicle's fuel efficiency:
Miles per Gallon (MPG)
Common in the US and UK, MPG tells you how many miles your vehicle can travel on one gallon of fuel. Higher MPG indicates better fuel efficiency. For example, 30 MPG means your vehicle can travel 30 miles using one gallon of fuel.
Kilometers per Liter (km/L)
Used in many countries, km/L shows how many kilometers your vehicle can travel on one liter of fuel. Like MPG, a higher number indicates better efficiency. For example, 12 km/L means your vehicle can travel 12 kilometers on one liter of fuel.
Liters per 100 Kilometers (L/100km)
Common in Europe and Canada, L/100km indicates how many liters of fuel your vehicle uses to travel 100 kilometers. Unlike MPG and km/L, a lower number indicates better efficiency. For example, 7 L/100km means your vehicle uses 7 liters of fuel to travel 100 kilometers.
1. Why is my actual gas mileage different from the manufacturer's rating?
Manufacturer fuel efficiency ratings are typically measured under ideal conditions. Real-world fuel efficiency can vary due to factors like driving style, traffic conditions, weather, terrain, vehicle maintenance, and fuel quality. Regular maintenance and efficient driving habits can help achieve better fuel economy.
2. How often should I calculate my gas mileage?
It's recommended to calculate your gas mileage every few fill-ups to monitor your vehicle's efficiency. A sudden decrease in fuel efficiency could indicate mechanical issues or changes in driving conditions. Keeping a log of your calculations can help identify trends and potential problems early.
3. Why do different regions use different fuel efficiency measurements?
Different regions adopted various measurements based on their historical use of imperial or metric systems. The US and UK traditionally use MPG, while metric countries often use km/L. L/100km was later adopted by many countries as it provides a more linear representation of fuel consumption and makes it easier to calculate fuel costs for specific distances.
4. How can I improve my vehicle's gas mileage?
You can improve fuel efficiency by maintaining proper tire pressure, removing excess weight, avoiding rapid acceleration and braking, using the recommended grade of motor oil, keeping your engine tuned, combining trips, avoiding excessive idling, and using cruise control on highways. Regular maintenance and smooth driving habits are key to maximizing fuel economy.
5. What is the scientific source for this calculator?
This calculator uses standard unit conversion factors established by the International System of Units (SI) and recognized by the National Institute of Standards and Technology (NIST). The conversion factors (1 mile = 1.60934 kilometers, 1 gallon = 3.78541 liters) are precise physical constants. The calculation methods follow basic principles of distance and volume measurement, using the fundamental relationship that fuel efficiency equals distance traveled divided by fuel consumed. These calculations are standardized across the automotive industry and used by government agencies like the EPA for fuel economy ratings.