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Home Page > Miscellaneous > General Tools

Miles per Gallon Calculator

Calculate MPG (miles per gallon), convert to L/100km, estimate fuel costs, compare vehicle efficiency, and track CO2 emissions with our comprehensive fuel economy calculator.

Free to useNo sign-up requiredUpdated Feb 2026
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About Miles per Gallon Calculator

Welcome to the Miles per Gallon Calculator, a comprehensive fuel economy tool that helps you calculate MPG, estimate trip costs, compare vehicles, and track CO2 emissions. Whether you're monitoring your car's efficiency, planning a road trip budget, or comparing vehicles for a purchase decision, this calculator provides all the metrics you need.

How to Calculate Miles per Gallon (MPG)

Calculating your vehicle's fuel economy is simple with the MPG formula:

Miles Per Gallon Formula
MPG = Distance Traveled (miles) ÷ Fuel Used (gallons)

For example, if you drove 350 miles on 12.5 gallons of gas, your MPG would be: 350 ÷ 12.5 = 28 MPG.

Step-by-Step MPG Calculation

  1. Fill your tank completely at a gas station and record your odometer reading (or reset your trip meter)
  2. Drive normally until you need to refuel again (at least 100+ miles for accuracy)
  3. Fill up again and note how many gallons it took to refill
  4. Calculate the distance driven and divide by gallons used
Pro Tip: For the most accurate results, always fill your tank to the same level (full) and calculate MPG over multiple fill-ups to account for driving variations.

What is a Good MPG?

Fuel economy varies significantly by vehicle type. Here's how different MPG ratings compare:

MPG RangeRatingTypical Vehicles
50+ MPGExcellent (A+)Hybrids, EVs (MPGe), small efficient cars
40-50 MPGVery Good (A)Compact cars, efficient sedans
30-40 MPGGood (B)Mid-size sedans, small SUVs
25-30 MPGAverage (C)Crossovers, minivans
20-25 MPGBelow Average (D)Full-size SUVs, large sedans
<20 MPGPoor (F)Full-size trucks, performance vehicles

Unit Conversions: MPG, L/100km, and km/L

Different countries use different fuel economy measurements. Our calculator automatically converts between all major units:

UnitUsed InConversion
MPG (US)United StatesBase unit
MPG (UK)United KingdomUS MPG × 1.201 = UK MPG
L/100kmEurope, Australia, Canada235.21 ÷ MPG = L/100km
km/LJapan, India, parts of AsiaMPG × 0.425 = km/L

Note: Lower L/100km values mean better fuel economy (less fuel per distance), while higher MPG or km/L values indicate better efficiency.

CO2 Emissions and Fuel Consumption

Every gallon of gasoline burned produces approximately 8.89 kg (19.6 lbs) of CO2. Diesel produces about 10.18 kg (22.4 lbs) per gallon. The calculator estimates your carbon footprint based on fuel consumption and type.

CO2 Emissions by Fuel Type

Fuel TypeCO2 per GallonCO2 per Liter
Regular Gasoline8.89 kg2.35 kg
Premium Gasoline8.89 kg2.35 kg
Diesel10.18 kg2.69 kg
E85 (Flex Fuel)5.76 kg1.52 kg

How to Improve Your MPG

You can significantly improve your fuel economy with these driving habits and maintenance tips:

Driving Habits

Vehicle Maintenance

US vs. UK Gallon: Understanding the Difference

There's an important distinction between US and UK (Imperial) gallons:

This means UK MPG figures are approximately 20% higher than US MPG for the same vehicle. Our calculator supports both units for accurate international comparisons.

Frequently Asked Questions

How do I calculate miles per gallon (MPG)?

To calculate MPG, divide the total miles driven by the gallons of fuel used. For example, if you drove 350 miles on 12.5 gallons of gas, your MPG is 350 ÷ 12.5 = 28 MPG. Our calculator handles this automatically and also converts to km/L and L/100km.

What is a good MPG for a car?

A good MPG depends on vehicle type. For conventional cars: 40+ MPG is excellent, 30-40 MPG is good, 25-30 MPG is average. SUVs and trucks typically get 20-30 MPG. Hybrid vehicles can achieve 50+ MPG, while EVs have equivalent MPGe ratings of 100+.

How do I convert MPG to L/100km?

To convert MPG to L/100km (liters per 100 kilometers), divide 235.21 by the MPG value. For example, 30 MPG = 235.21 ÷ 30 = 7.84 L/100km. Lower L/100km values indicate better fuel efficiency.

How much CO2 does my car produce per mile?

A typical gasoline car produces about 8.89 kg of CO2 per gallon burned. If your car gets 25 MPG, it produces approximately 0.36 kg (0.79 lbs) of CO2 per mile. Diesel vehicles produce about 10.18 kg CO2 per gallon.

How much can I save by driving a more fuel-efficient car?

Fuel savings depend on your driving habits and fuel prices. At $3.50/gallon driving 15,000 miles/year: A car getting 30 MPG costs $1,750/year in fuel. A 20 MPG vehicle costs $2,625/year - that's $875 more annually. Use our comparison calculator for personalized estimates.

What's the difference between US and UK gallons?

A US gallon equals 3.785 liters while a UK (Imperial) gallon equals 4.546 liters - about 20% larger. This means UK MPG figures are higher than US MPG for the same vehicle. Our calculator supports both units.

Additional Resources

Reference this content, page, or tool as:

"Miles per Gallon Calculator" at https://MiniWebtool.com/miles-per-gallon-calculator/ from MiniWebtool, https://MiniWebtool.com/

by miniwebtool team. Updated: Feb 01, 2026

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