What is the Fuel Cost Calculator?
The Fuel Cost Calculator estimates how much you will spend on gas for a trip. By combining the distance you plan to drive, your vehicle's fuel efficiency (miles per gallon), and the current price of fuel, it tells you the total cost, the number of gallons you will burn, and your effective cost per mile. It's perfect for budgeting road trips, comparing routes, or splitting gas money with friends.
How to use it
Enter three values: the trip distance in miles, your car's fuel efficiency in MPG (check your dashboard or owner's manual), and the price per gallon you expect to pay. Click calculate and the tool returns the total fuel cost along with gallons consumed and cost per mile.
The formula explained
The math is simple: first divide the distance by your MPG to find how many gallons the trip requires. Then multiply that by the price per gallon. In symbols:
$$\text{Cost} = \frac{\text{Distance (mi)}}{\text{MPG}} \times \text{Price (\$/gal)}$$Cost per mile is just the total cost divided by the distance, a handy figure for comparing vehicles.
Worked example
Suppose you drive 300 miles in a car that gets 30 MPG, and gas costs $3.50 per gallon. Gallons used = \(300 \div 30 = 10\) gallons. Total cost:
$$\text{Cost} = 10 \times \$3.50 = \$35.00$$Cost per mile = \(\$35.00 \div 300 \approx \$0.117\).
FAQ
Does this work for kilometers and liters? The default labels use miles and gallons, but the math is unit-agnostic — just be consistent (e.g., km, km/L, and price per liter) and the result follows the same units.
What about a round trip? Double the one-way distance before entering it, or run the calculation twice.
How do I find my MPG? Many cars display average MPG on the dashboard, or you can divide miles driven by gallons used at your last fill-up.
