Calculate fuel cost for any road trip or commute using distance, MPG and gas price. Get gallons needed and cost per mile. Free fuel calculator — Calculator4U
Calculate fuel costs for trips and commutes.
A fuel cost calculator tells you exactly how much you will spend on gas for any road trip or daily commute — based on your exact distance, your vehicle's MPG, and today's local gas price. According to the US Department of Energy, the average American household spends $2,000–$3,000 per year on gasoline. The difference between a 35 MPG compact car and an 18 MPG full-size SUV on a 500-mile road trip is $34 — and over 15,000 annual miles that gap grows to nearly $1,900 per year at the US average gas price of $3.50 per gallon. Getting your fuel cost right before you drive helps you compare routes, budget accurately, and decide whether a more fuel-efficient vehicle makes financial sense for your situation.
The formula is straightforward: Total Fuel Cost = (Distance ÷ MPG) × Gas Price per Gallon. Cost per mile = Gas Price ÷ MPG. At $3.50 per gallon, a 28 MPG sedan costs $0.125 per mile while a 16 MPG pickup truck costs $0.219 per mile — 75% more for the same distance. For road trips, use your vehicle's highway MPG from EPA fueleconomy.gov, which is typically 10–20% better than city or combined MPG. Add a 10–15% buffer for stop-and-go city driving at your destination, mountain terrain, headwinds, or air conditioning use — all of which reduce real-world fuel efficiency below EPA-rated figures.
Use the free Calculator4U fuel cost calculator above to enter your trip distance, your vehicle's MPG, and today's gas price — and instantly see your total fuel cost, gallons needed, cost per mile, and how many fill-ups to plan for your route.
Use this formula: Total Fuel Cost = (Total Distance ÷ Vehicle MPG) × Gas Price per Gallon. Example: a 500-mile road trip in a car that gets 28 MPG with gas at $3.50 per gallon costs (500 ÷ 28) × $3.50 = 17.9 gallons × $3.50 = $62.50. For round trips, double the one-way distance before calculating. Use your vehicle's highway MPG for road trips — find it at EPA fueleconomy.gov or on your dashboard display. Highway MPG is typically 10–20% better than city MPG. Check real-time US gas prices along your route at GasBuddy.com or AAA's daily gas price tracker before departing for the most accurate estimate.
Gallons needed = Total Trip Distance ÷ Your Vehicle's MPG. A 400-mile trip at 25 MPG requires 16 gallons. At 35 MPG it requires only 11.4 gallons — saving $16.10 at $3.50/gallon. For a 1,000-mile road trip: at 20 MPG you need 50 gallons, at 28 MPG you need 35.7 gallons, at 35 MPG you need 28.6 gallons. Most US cars hold 12–18 gallons per tank. Divide your total gallons needed by your tank capacity to plan how many fill-ups you need. For trips over 300 miles, check gas station availability along your specific route — rural interstate stretches in states like Nevada, Montana, and Wyoming can have 50–100 miles between stations.
The top seven fuel-saving strategies with documented EPA and DOE savings: (1) Avoid aggressive driving — smooth acceleration and braking improves efficiency by 15–30% on highways. (2) Use cruise control — maintains steady speed, saves 7–14% on highway fuel. (3) Maintain proper tire pressure — each 1 PSI below recommended reduces MPG by 0.2%; check monthly. (4) Drive 55–60 mph instead of 70–75 mph — for every 5 mph over 50 mph, fuel economy drops equivalent to paying $0.20–$0.40 more per gallon. (5) Remove roof racks when not in use — reduces aerodynamic drag, saves 2–8% at highway speeds. (6) Avoid excessive idling — burns 0.25–0.5 gallons per hour; turn off engine if stopped more than 60 seconds. (7) Remove excess weight — every 100 lbs reduces MPG by 1–2%. Combined, these habits can reduce annual US fuel spending by $200–$600 for the average driver.
Cost per mile = Gas Price ÷ MPG. At the US average of $3.50 per gallon in 2026: a hybrid at 50 MPG costs $0.07 per mile, a compact car at 35 MPG costs $0.10 per mile, a midsize sedan at 28 MPG costs $0.125 per mile, a crossover SUV at 26 MPG costs $0.135 per mile, a full-size SUV at 18 MPG costs $0.194 per mile, and a pickup truck at 16 MPG costs $0.219 per mile. Driving 15,000 miles per year, the annual cost difference between a 35 MPG compact and a 16 MPG pickup is $1,785 at $3.50/gallon. Over five years that is $8,925 in extra fuel costs — a significant factor when comparing vehicle purchase decisions.
At the US average gas price of $3.50 per gallon, fuel cost by distance and vehicle type: For 100 miles — compact car (35 MPG): $10.00, midsize sedan (28 MPG): $12.50, crossover SUV (26 MPG): $13.46, full-size SUV (18 MPG): $19.44, pickup truck (16 MPG): $21.88. For 500 miles — compact: $50, sedan: $62.50, crossover: $67.31, full-size SUV: $97.22, pickup: $109.38. For 1,000 miles — compact: $100, sedan: $125, crossover: $134.62, full-size SUV: $194.44, pickup: $218.75. These figures use EPA combined MPG ratings from fueleconomy.gov 2025–2026 model year data. Real-world costs may be 10–15% higher due to driving conditions.
Annual commute fuel cost = (Annual Miles ÷ MPG) × Gas Price per Gallon. The average US commuter drives 15,000 miles per year (Bureau of Transportation Statistics). At $3.50/gallon: a 35 MPG compact car costs $1,500 per year, a 28 MPG sedan costs $1,875 per year, a 20 MPG crossover costs $2,625 per year, and a 16 MPG pickup costs $3,281 per year. For monthly cost, divide annual by 12. To calculate your specific commute: (Daily one-way miles × 2 × working days per year) ÷ MPG × gas price. A 25-mile one-way commute at 260 working days = 13,000 miles annually. At 28 MPG and $3.50/gallon that is $1,625 per year in fuel alone, before parking, tolls, and maintenance.
US average regular unleaded gas prices fluctuate throughout the year. As of 2026, the national average hovers between $3.00 and $3.80 per gallon depending on season and oil markets, with summer driving season typically pushing prices higher. State-level variation is significant: California and Hawaii consistently have the highest gas prices in the US, regularly exceeding $4.50–$5.00 per gallon due to state taxes and reformulated fuel requirements. The cheapest gas states are typically Mississippi, Louisiana, Texas, and Oklahoma, often $0.50–$1.00 below the national average. For the most current prices along your specific route, use GasBuddy.com, AAA's Daily Fuel Gauge Report, or the US Energy Information Administration (EIA) weekly retail gas price data at eia.gov.