Gas Mileage Calculator - MPG Calculator

Gas Mileage Calculator - Calculate Fuel Efficiency and Cost Per Mile

Calculate your vehicle's gas mileage, fuel cost per mile, and trip expenses with our free gas mileage calculator. Track your fuel efficiency and estimate travel costs accurately.

How to Use the Gas Mileage Calculator

1. Fill up your tank completely and reset your odometer
2. Drive normally until you need to refuel
3. Fill up again and note the gallons needed
4. Enter the miles driven and gallons used
5. Enter the gas price per gallon
6. Get your results including MPG and cost per mile

What Does This Calculator Calculate?

Primary Metrics:

• MPG (Miles Per Gallon): Your vehicle's fuel efficiency
• Cost Per Mile: How much each mile costs to drive
• Total Trip Cost: Fuel cost for the distance traveled

Additional Conversions:

• Gallons per 100 Miles: Fuel consumption rate
• Liters per 100km: Metric fuel efficiency measurement

Understanding Cost Per Mile

What is Cost Per Mile?

Cost per mile tells you exactly how much you're spending to drive each mile. This helps you budget for trips and compare vehicle efficiency.

Example Calculation:

Miles Driven: 300 miles
Gallons Used: 10 gallons
Gas Price: $3.50/gallon

MPG = 300 / 10 = 30 MPG
Cost Per Mile = (10 × $3.50) / 300 = $0.117 per mile
Total Cost = 10 × $3.50 = $35.00

Annual Fuel Cost Estimates

Based on your calculated cost per mile, here are estimated annual fuel costs:

Annual Miles10 MPG	20 MPG	30 MPG	40 MPG
12,000	$4,200	$2,100	$1,400	$1,050
15,000	$5,250	$2,625	$1,750	$1,313
20,000	$7,000	$3,500	$2,333	$1,750

Based on $3.50 per gallon

Tips to Improve Gas Mileage

Driving Habits That Save Fuel:

• Maintain steady speeds between 55-65 mph
• Use cruise control on highways
• Avoid rapid acceleration and hard braking
• Combine trips to avoid cold starts
• Reduce unnecessary idling
• Remove excess weight from the vehicle

Vehicle Maintenance:

• Keep tires properly inflated (adds 3% MPG)
• Use the manufacturer's recommended oil grade
• Replace air filters regularly
• Keep the engine tuned properly
• Check gas cap for proper seal

Expected Savings:

• Proper tire pressure: Save up to $0.11/gallon
• Smoother driving: Save 10-15% on fuel
• Regular maintenance: Save up to 4% on fuel costs

Why Track Your Gas Mileage?

Financial Benefits:

• Budget accurately for fuel expenses
• Compare vehicles when shopping
• Calculate trip costs for travel planning
• Track expenses for tax deductions (business use)

Vehicle Health:

• Detect problems early (declining MPG indicates issues)
• Verify maintenance effectiveness
• Monitor tire pressure impact on efficiency