🚗 Trip Fuel Cost Calculator

How to Use This Fuel Cost Calculator

1. Enter the Trip Distance and select Miles or Kilometers
2. Enter the Fuel Price and select currency unit ($/gal, €/L, £/L)
3. Enter Vehicle Name and Fuel Efficiency (MPG or L/100km)
4. Click Add Another Vehicle to compare up to 3 vehicles
5. Click Calculate Trip Cost — see fuel required, total cost, cost per mile
6. View savings analysis (best choice badge) and environmental impact (CO2 emissions)
7. Use Quick Presets for Road Trip, Daily Commute, or European Trip

How Fuel Cost is Calculated (Formulas)

US Units (MPG, miles, $/gallon):
Gallons Required = Distance (miles) ÷ MPG
Trip Cost = Gallons × Fuel Price ($/gal)

Metric Units (L/100km, km, €/liter):
Liters Required = Distance (km) × (L/100km ÷ 100)
Trip Cost = Liters × Fuel Price (€/L)

Conversion: MPG ↔ L/100km = 235.214 ÷ value

Real Example

Inputs:

• Trip Distance: 300 miles
• Fuel Price: $3.50/gallon
• Vehicle 1: SUV — 22 MPG
• Vehicle 2: Sedan — 35 MPG

Results:

• SUV: 13.6 gallons | $47.60 total | $0.159/mile
• Sedan: 8.6 gallons | $30.00 total | $0.100/mile (🏆 BEST CHOICE)
• Savings: $17.60 (37% less fuel cost)
• CO2 Emissions: SUV ~121 kg, Sedan ~76 kg

Why Use This Fuel Cost Calculator?

• ✅ Compare Multiple Vehicles — Up to 3 vehicles side-by-side
• ✅ US & Metric Units — Miles/KM, MPG/L/100km, $/€/£ per gallon/liter
• ✅ Best Choice Badge — Automatically highlights most fuel-efficient option
• ✅ Savings Analysis — See exact dollars saved by choosing efficient vehicle
• ✅ Environmental Impact — CO2 emissions calculation (8.887 kg CO2 per gallon)
• ✅ Quick Presets — Road trip (500 miles), Commute (30 miles), Europe (km/L)
• ✅ Free & Unlimited — No signup required
• ✅ Mobile Friendly — Responsive design for phones, tablets, and desktops

Frequently Asked Questions

How do I convert MPG to L/100km?

MPG to L/100km: 235.214 ÷ MPG = L/100km
L/100km to MPG: 235.214 ÷ L/100km = MPG
Example: 25 MPG = 235.214 ÷ 25 = 9.4 L/100km

How do I convert miles to kilometers?

Miles to km: Miles × 1.60934 = Kilometers
km to miles: Kilometers × 0.621371 = Miles

What is a good MPG for a car?

2026 averages:
– City driving: 25-35 MPG is good, 35-50+ MPG is excellent
– Highway driving: 30-40 MPG is good, 40-60+ MPG is excellent
– Hybrid vehicles: 45-60 MPG
– Electric vehicles: Equivalent to 100+ MPGe

How much CO2 does a gallon of gas produce?

Burning 1 gallon of gasoline produces approximately 8.887 kg (19.6 lbs) of CO2. This calculator uses this EPA figure to estimate your trip’s carbon footprint.

How can I reduce my fuel costs?

Driving habits: Avoid rapid acceleration, maintain steady speed, reduce idling
Vehicle maintenance: Keep tires inflated, use recommended oil, replace air filters
Route planning: Avoid traffic, combine trips, use cruise control on highways
Vehicle choice: Choose more efficient vehicle for long trips

Does fuel price include taxes?

Enter the pump price you actually pay, which already includes federal/state taxes. No need to add separately.

Related Travel & Vehicle Calculators

• Auto Loan Calculator — Calculate car loan payments and true total cost
• Simple Car Loan Calculator — Quick monthly payment estimate
• Currency Converter — Convert fuel prices between currencies
• Date Calculator — Plan trip dates and durations

Disclaimer: This fuel cost calculator provides estimates for informational purposes only. Actual fuel consumption varies based on driving conditions, traffic, vehicle load, tire pressure, and driving habits. CO2 emissions are approximate using EPA standard factors.