MPG Calculator
How do you calculate miles per gallon? Calculate miles per gallon from distance and fuel used.
Interactive inputs
Live result
30.00
MPG
Change an input to update the diagram.
Answer first
How do you calculate miles per gallon?
The MPG Calculator converts your odometer reading and fuel fill-up into miles per gallon, the standard US measure of fuel efficiency. Designed for drivers who want to track real-world fuel economy after each trip or fill-up. Knowing your actual MPG helps spot maintenance issues, compare routes, and plan budgets.
Current calculator output
30.00
MPG
How it works
MPG Calculator: inputs, formula, and result
By accepting starting and ending odometer readings alongside fuel volume added, this precise calculator computes your miles per gallon. It cuts through manufacturer claims to reveal the exact efficiency your car achieved on a specific route or tank.
Formula
MPG = Distance (miles) ÷ Fuel Used (gallons)
Worked example
Driving 360 miles on 12 gallons: MPG = 360 ÷ 12 = 30 MPG.
Pro tip: Track your MPG over at least three consecutive fill-ups to get a reliable average. A single measurement can be skewed by city vs. highway mix.
Personalized guidance
What changes the result for MPG?
Outcomes vary significantly based on idling time, the use of air conditioning, average cruising speed, and the terrain elevation changes encountered during the drive. Traffic, tire pressure, vehicle load, terrain, driving style, weather, fuel price, and the quality of the input data can change the final result.
Estimated result condition
100%
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When should you use this calculator?
This is the definitive tool for road trippers and commuters who want to verify their vehicle's dashboard computer. Use it to establish a reliable baseline of fuel efficiency tailored precisely to your unique driving style and regular geographic routes.
Selected usePlan with MPG Calculator
FAQ
FAQs about MPG
3 questions
Question 1 of 3 is open
What is a good MPG for a car?
Most modern sedans achieve 25-35 MPG in mixed driving. Compact cars and hybrids reach 40-60 MPG, while trucks and SUVs get 15-25 MPG.
Why is my real MPG lower than the EPA rating?
EPA tests use controlled lab conditions. Real-world factors like traffic, speed, AC, cargo, tire pressure, and cold weather typically reduce MPG by 10-20%.
Does highway or city driving give better MPG?
Highway driving usually gives 20-30% better MPG because steady speeds are more fuel-efficient than stop-and-go traffic.
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