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Gas Mileage Calculator
Calculate your car's MPG, L/100km, and trip fuel cost.
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Enter the distance you drove, the fuel you used, and the fuel price to compute your vehicle's fuel economy and the cost of the trip.
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How is MPG calculated?
MPG = Distance (miles) ├╖ Fuel Used (gallons). For metric mode, we compute L/100km = (Fuel Used in L ├╖ Distance in km) ├Ч 100.
What is the difference between MPG and L/100km?
MPG (US/imperial) is distance per fuel unit тАФ higher is better. L/100km (metric) is fuel per fixed distance тАФ lower is better.
How do I estimate trip cost?
Trip Cost = Fuel Used ├Ч Fuel Price. Use the cost-per-mile value to project costs across longer distances.
How to Use the Gas Mileage Calculator
Compute your vehicle's MPG (or L/100km) and trip fuel cost based on the distance you drove and the fuel you used.
- Pick a unit system: imperial (miles and gallons) or metric (km and liters).
- Enter the distance you traveled on your trip.
- Enter the fuel you used for that trip.
- Enter the price per gallon (or per liter) for trip cost estimates.
Fuel Economy Formulas
MPG
Higher MPG = better fuel economy.
Example:
Input: 300 miles, 10 gallons
Calculation: 300 ├╖ 10
Result: 30 MPG
L/100km
Lower L/100km = better fuel economy.
Example:
Input: 40 liters, 500 km
Calculation: (40 ├╖ 500) ├Ч 100
Result: 8 L/100km
Trip Cost
Multiply gallons by $/gallon (or liters by $/liter).
Example:
Input: 10 gal ├Ч $3.50
Calculation: 10 ├Ч 3.50
Result: $35.00
Real-World Use Cases
Road Trips
Plan fuel budgets for long drives.
MPG Tracking
Compare fill-ups to see if your car's efficiency is changing.
Tips
Tips
- Fill up your tank completely to get accurate MPG per tank.
- Cost per mile is a great way to compare commutes or vehicles.