Use this road trip cost calculator to estimate gas money at current weekly US prices, and split it with the people sharing the drive.
$47.94
Divide the trip’s total gas cost by the number of riders sharing it to get each person’s gas money share. Include the driver in the rider count when everyone pays an equal share.
For a 300-mile one-way trip at 25 MPG and the US regular average of $3.995/gal, gas costs $47.94. Split among 3 riders including the driver, that is $15.98 per person. Enter your group size in Riders sharing gas to see your share.
Example price: EIA weekly US regular price · .
PLAN YOUR ROAD TRIP
At the US regular average of $3.995/gal, a 300-mile trip at 25 MPG costs $47.94. Use the table to compare one-way trips at different fuel economies.
EIA weekly price for · EIA weekly US regular price
| Trip distance | 20 MPG | 25 MPG | 30 MPG | 35 MPG |
|---|---|---|---|---|
| 100 miles | $19.98 | $15.98 | $13.32 | $11.41 |
| 300 miles | $59.93 | $47.94 | $39.95 | $34.24 |
| 500 miles | $99.88 | $79.90 | $66.58 | $57.07 |
| 1,000 miles | $199.75 | $159.80 | $133.17 | $114.14 |
THE QUICK MATH
Divide your total miles by your vehicle’s MPG, then multiply the gallons by the price per gallon.
For a 300-mile drive at 25 MPG, you need 12 gallons. At $3.995/gal, that comes to $47.94. Divide the total by the number of people to split it evenly.
Example price: EIA weekly US regular price · Nov 9, 2026.
(Miles ÷ MPG) × Price per gallon
One-way miles × 2
YOUR STARTING PRICE
Weekly regional gas prices are EIA retail averages that include taxes, shown in dollars per US gallon. Choose your state above for its published state price or its PADD regional average. Select a price to open its EIA source.
Swipe or scroll sideways to compare all fuel types.
| Region | Regular | Midgrade | Premium | Diesel |
|---|---|---|---|---|
| United States | $3.995 | $4.608 | $5.013 | $6.127 |
| East Coast (PADD 1) | $3.847 | $4.363 | $4.766 | $5.920 |
| New England (PADD 1A) | $4.060 | $4.709 | $5.071 | $6.349 |
| Central Atlantic (PADD 1B) | $4.146 | $4.669 | $5.027 | $6.412 |
| Lower Atlantic (PADD 1C) | $3.609 | $4.103 | $4.494 | $5.694 |
| Midwest (PADD 2) | $3.868 | $4.362 | $4.986 | $6.201 |
| Gulf Coast (PADD 3) | $3.481 | $4.024 | $4.370 | $5.741 |
| Rocky Mountain (PADD 4) | $3.946 | $4.321 | $4.638 | $6.206 |
| West Coast (PADD 5) | $5.110 | $5.593 | $5.761 | $7.110 Except California: $6.429 |
Source: US Energy Information Administration, Gasoline and Diesel Fuel Update. Snapshot retrieved Nov 12, 2026.
BEFORE YOU GO
Trip gas cost is total miles divided by MPG, multiplied by price per gallon; divide that cost by riders to split gas money.
Divide your road trip’s total miles by your vehicle’s MPG, then multiply by the price per gallon. Enter the distance and MPG above, choose your fuel price location, and select Round trip if you are driving back.
A 100-mile one-way trip at 25 MPG costs $15.98 in gas at the US regular average of $3.995/gal. It uses 4 gallons; divide the total by your riders to find each person’s share.
Example price: EIA weekly US regular price · .
Gas cost for any distance is miles ÷ MPG × price per gallon. Use the calculator for your distance or compare the one-way examples above. For gas plus maintenance, tires, insurance and depreciation, use the Cost Per Mile Calculator.
Double your one-way distance before dividing by MPG and multiplying by the gas price. Select Round trip in the calculator to include both drives automatically.
Divide the trip’s total gas cost by the number of people sharing it, including the driver when everyone pays equally. Enter that number under Riders sharing gas to see each person’s share.
The calculator uses EIA’s weekly state average for California, Colorado, Florida, Massachusetts, Minnesota, New York, Ohio, Texas, and Washington when that fuel is published. Other selections use the state’s PADD regional average; diesel uses California’s state price or a regional price. The location, week, and EIA source link appear under the price field.
Yes. Enter your pump price in Price per gallon to calculate with your own rate. Choosing a different state or fuel type loads its EIA weekly default.
Use your measured MPG for similar driving, or choose your vehicle to fill in EPA combined MPG from FuelEconomy.gov. A mostly highway trip can use your vehicle’s highway MPG, entered directly in the fuel economy field.
Yes. Choose Diesel, enter your diesel vehicle’s MPG, and use the sourced weekly diesel price or your own pump price.
