Auto calculator
MPG Calculator
Calculate miles per gallon from miles driven and gallons used.
Quick answer
How do you calculate MPG?
Divide the miles driven by the gallons of fuel used. If you drove 360 miles on 12 gallons, your fuel economy is 360 ÷ 12 = 30 MPG.
MPG = miles driven / gallons used
⚡ Answer updates as you type · Enter = calculate · Esc = reset
The MPG Calculator finds miles per gallon from miles driven and gallons used.
About this MPG Calculator
Find your real-world miles per gallon by entering miles driven and gallons used at the pump. Track fuel efficiency over time to spot maintenance issues.
What you'll need
- • Miles driven since last fill-up
- • Gallons added at the pump
How it works
- 1. Fill up your tank and reset the trip odometer.
- 2. Drive normally until the next fill-up.
- 3. Note the miles and gallons added.
- 4. Enter both numbers to get MPG.
Worked example
Driving 360 miles on 12 gallons gives 30 MPG.
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MPG Calculator FAQ
What is the MPG Calculator?
The MPG Calculator is a free online tool that helps you calculate miles per gallon from miles driven and gallons used.
How do I use the MPG Calculator?
Open the MPG Calculator, enter the requested values, and review the instant estimate on the page.
Is the MPG Calculator free?
Yes. The MPG Calculator is free to use on Fast Online Calculator and does not require an account.
Why is my MPG lower than the EPA rating?
City driving, short trips, cold weather, roof racks, and aggressive driving all lower real-world MPG vs. EPA test conditions.
How can I improve MPG?
Keep tires properly inflated, avoid hard acceleration, remove extra weight, and use cruise control on the highway.
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