Road Trip Planner
Fuel Cost
Calculator
US Avg Gas
~$3.50/gal
Avg New Car
25 MPG
Estimate your fuel cost before you hit the road. Enter the distance you plan to drive, your vehicle's MPG rating and the current gas price per gallon. The calculator instantly shows the total fuel cost, gallons needed, cost per mile and round trip expense. Perfect for road trips, daily commutes and comparing fuel costs between vehicles across the United States.
Trip Details
Total Fuel Cost
$0.00
Gallons Needed
0.0
Cost Per Mile
$0.00
Round Trip Cost
$0.00
How the fuel cost calculator works
Start by entering the one-way distance of your trip in miles. You can type the exact figure or drag the slider to adjust quickly. The calculator accepts distances up to 5,000 miles to cover even cross-country journeys.
Next, set your vehicle's fuel efficiency in miles per gallon (MPG). You will find your combined MPG rating on the vehicle's window sticker, in the owner's manual, or by searching your make and model on fueleconomy.gov. The default is 25 MPG, which is close to the national average for passenger cars.
Then enter the current gas price per gallon. Check GasBuddy, AAA or your local station for today's price. The slider covers $1.00 to $8.00 per gallon to accommodate price swings across all 50 states.
The calculator divides your distance by your MPG to find gallons needed, then multiplies by the price per gallon to get total fuel cost. It also shows cost per mile and doubles everything for a round trip estimate. Results update instantly as you change any input.
What you need to know about fuel costs in the US
Gas prices in the United States vary widely by state and region. California, Hawaii and parts of the Pacific Northwest consistently have the highest prices, often $1.00 or more above the national average. Gulf Coast states like Texas, Louisiana and Mississippi typically have the lowest prices due to proximity to refineries.
The EPA rates every new vehicle sold in the US for combined city and highway fuel economy. As of 2025, the average new car achieves roughly 25-27 MPG combined. Compact sedans often reach 30-35 MPG, mid-size SUVs average 22-28 MPG, and full-size pickup trucks typically get 18-23 MPG. Hybrid vehicles can achieve 45-55 MPG, and plug-in hybrids offer even higher equivalent ratings.
Real-world fuel economy often differs from EPA estimates by 10-15%. Factors that reduce MPG include aggressive driving, highway speeds above 60 mph, heavy cargo, cold weather and under-inflated tires. Conversely, steady speeds, proper tire pressure and regular maintenance can help you meet or exceed the rated MPG.
The IRS standard mileage rate for 2025 is 70 cents per mile, which covers fuel plus wear, insurance and depreciation. If your fuel cost per mile is well below this figure, your vehicle is relatively efficient to operate. Use this calculator to compare fuel costs across different vehicles before buying.
Frequently asked questions
How do I calculate fuel cost for a road trip?
Divide your total trip distance in miles by your vehicle's MPG rating to get gallons needed. Multiply gallons by the current gas price per gallon to get total fuel cost. Use the fuel cost calculator above to get the answer instantly without any math.
What is the average MPG for a car in the US?
The average fuel economy for new passenger cars in the US is around 25-27 MPG according to EPA estimates. SUVs and trucks average 20-23 MPG, while hybrids can reach 45-55 MPG. Check your vehicle's window sticker or fueleconomy.gov for your exact rating.
How much does it cost to drive 1,000 miles?
At 25 MPG and $3.50 per gallon, driving 1,000 miles costs about $140 in fuel. The actual cost depends on your vehicle's fuel efficiency and local gas prices. Enter your exact values into the calculator above for a precise estimate.
What is cost per mile and why does it matter?
Cost per mile is your fuel expense divided by the distance driven. It helps you compare the running costs of different vehicles, budget for commutes and decide whether driving or flying is cheaper for long trips. The IRS standard mileage rate for 2025 is 70 cents per mile.
How do I find the current gas price near me?
Check GasBuddy or AAA's fuel gauge report for current local and national average prices. As of early 2026, the US national average is roughly $3.20-$3.80 per gallon for regular unleaded, though prices vary significantly by state and region.
Does driving speed affect fuel cost?
Yes. Most vehicles are most fuel-efficient between 45-65 mph. Above 50 mph, every 5 mph increase is roughly equivalent to paying an extra $0.20-$0.30 per gallon. Aggressive acceleration and hard braking also reduce fuel economy by 15-30% in city driving.