Gas Mileage Calculator (MPG)

Calculate your vehicle's fuel economy, cost per mile, and estimated annual fuel costs. Compare savings by improving your MPG.

Trip Details

Miles Driven

Gallons Used

Cost per Gallon ($)

Fuel Economy

MPG
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Cost per Mile
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Trip Cost

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Monthly Cost*

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Annual Cost*

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CO₂ Emissions

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* Based on 1,000 miles per month / 12,000 miles per year

MPG Comparison — Potential Savings

If you improved your MPG, here's how much you'd save annually (12,000 mi/yr at your fuel price):

MPG	Gal / Year	Annual Cost	vs Current	Savings / Year

CO₂ estimate: 19.6 lbs per gallon of gasoline burned

Understanding MPG

Miles Per Gallon (MPG) measures how far your vehicle can travel on one gallon of fuel. Higher MPG means better fuel efficiency and lower costs. The comparison table shows how much you could save by switching to a more fuel-efficient vehicle or improving driving habits.

About this Calculator

The Gas Mileage Calculator is a free, easy-to-use tool for MPG, fuel, efficiency. Simply enter your values and get instant, accurate results — no signup, no ads, no tracking. All calculations run locally in your browser, so your data stays completely private.

Privacy Note: All calculations are performed locally in your browser. No data is ever sent to a server or third party.