Fuel Mileage Calculator

Calculate your vehicle's fuel efficiency and trip costs instantly.

Starting Odometer Reading

Ending Odometer Reading

Fuel Consumed (Gallons/Liters)

Price per Unit of Fuel ($)

Calculation Results:

Total Distance: 0 units

Fuel Efficiency: 0 per unit

Total Trip Cost: $0.00

Cost Per Distance Unit: $0.00

Please enter valid positive numbers. Ending odometer must be greater than starting odometer.

Understanding Mileage Calculation

Knowing your vehicle's fuel efficiency is essential for budgeting and monitoring your car's health. Significant drops in mileage can often signal mechanical issues like low tire pressure, clogged air filters, or engine misfires.

The Mileage Formula

To calculate your mileage manually, you can use the following formula:

            Mileage = (Ending Odometer – Starting Odometer) / Fuel Consumed
        

Example Calculation

If you start your trip at 10,000 miles and finish at 10,300 miles, you have traveled 300 miles. If you refill your tank with 10 gallons of gas to get back to full, your calculation would look like this:

Total Distance: 300 miles
Fuel Used: 10 gallons
Calculation: 300 / 10 = 30 MPG

Tips for Better Fuel Economy

Maintain Steady Speeds: Excessive acceleration and braking waste fuel.
Check Tire Pressure: Under-inflated tires increase rolling resistance.
Reduce Weight: Remove unnecessary heavy items from your trunk.
Regular Maintenance: Keep your engine tuned and change oil regularly.

function calculateMileage() { var start = parseFloat(document.getElementById('startOdometer').value); var end = parseFloat(document.getElementById('endOdometer').value); var fuel = parseFloat(document.getElementById('fuelConsumed').value); var price = parseFloat(document.getElementById('fuelPrice').value); var resultDiv = document.getElementById('mileage-results'); var errorDiv = document.getElementById('error-msg'); // Reset displays resultDiv.style.display = 'none'; errorDiv.style.display = 'none'; // Validation if (isNaN(start) || isNaN(end) || isNaN(fuel) || fuel <= 0 || end 0) { totalCost = fuel * price; costPerUnit = totalCost / distance; } // Update UI document.getElementById('resDistance').innerText = distance.toLocaleString(); document.getElementById('resEfficiency').innerText = efficiency.toFixed(2); document.getElementById('resTotalCost').innerText = totalCost.toFixed(2); document.getElementById('resCostPerUnit').innerText = costPerUnit.toFixed(2); resultDiv.style.display = 'block'; }