Gas Mileage Calculator
Calculate fuel economy in MPG and L/100km.
Fuel Economy Input
miles
gallons
Fuel Economy
Miles Per Gallon
30.00 MPG
Liters Per 100 km
7.84 L/100km
Kilometers Per Liter
12.75 km/L
Fuel Consumption:
300 miles / 10 gallons
About This Calculator
The Gas Mileage Calculator calculates fuel economy in miles per gallon (MPG) or liters per 100 kilometers (L/100km). Enter the distance traveled and the amount of fuel used, and the calculator will compute your vehicle's fuel efficiency.
This calculator is useful for tracking fuel economy, comparing vehicles, and estimating fuel costs. It converts between imperial (MPG) and metric (L/100km) units automatically, making it useful regardless of your location or measurement system.
Formula & Calculation Method
Gas Mileage Calculation:
Miles Per Gallon (MPG):
MPG = Distance (miles) ÷ Fuel Used (gallons)
Liters Per 100 Kilometers:
L/100km = (Fuel Used (liters) ÷ Distance (km)) × 100
Kilometers Per Liter:
km/L = Distance (km) ÷ Fuel Used (liters)
Conversions:
1 MPG = 0.425144 km/L
1 km/L = 2.352145 MPG
Higher MPG or lower L/100km values indicate better fuel economy. The calculator automatically converts between imperial and metric units for easy comparison.
How to Use This Calculator
- Select Unit System: Choose imperial (miles/gallons) or metric (kilometers/liters).
- Enter Distance: Input the distance traveled (miles or kilometers).
- Enter Fuel Used: Input the amount of fuel consumed (gallons or liters).
- View Results: See MPG, L/100km, and km/L calculated automatically.
Frequently Asked Questions
How do I calculate gas mileage?
Divide the distance traveled by the amount of fuel used. For example, if you drove 300 miles and used 10 gallons, your gas mileage is 30 MPG (300 ÷ 10 = 30).
What is a good gas mileage?
Gas mileage varies by vehicle type. Generally, 30+ MPG is considered good for most passenger vehicles, 40+ MPG is excellent, and 50+ MPG is outstanding. Hybrid and electric vehicles typically achieve much higher equivalent ratings.
What is the difference between MPG and L/100km?
MPG (miles per gallon) measures how many miles you can drive per gallon of fuel - higher is better. L/100km (liters per 100 kilometers) measures fuel consumption - lower is better. They measure the same thing but in opposite ways.
How can I improve my gas mileage?
You can improve gas mileage by: maintaining proper tire pressure, driving at steady speeds, avoiding rapid acceleration and braking, removing excess weight, keeping your vehicle well-maintained, and using the recommended grade of motor oil.
NumCalculators Editorial Team
Multi-disciplinary Expert Team
The NumCalculators Editorial Team consists of subject matter experts across various fields who review and verify the accuracy of our calculators. Each calculator undergoes rigorous testing and validation before publication.