Gas Budget Calculator
Turn your weekly driving into a monthly number you can plan around.
Your weekly and monthly mileage
Estimated monthly fuel cost
$165.08Based on your weekly drivingMonthly gas budget at different prices
For 250 miles per week and a car averaging 28 MPG. The U.S. regular gasoline average was $4.27/gal on 2026-10-26.
| Price per gallon | $3.00 | $3.50 | $4.00 | $4.27 (U.S. avg.) | $4.50 |
|---|---|---|---|---|---|
| Monthly fuel | $115.98 | $135.31 | $154.64 | $165.08 | $173.97 |
Commuting vs weekend driving
Add your typical commute and weekend miles for a useful weekly average. Multiply by 4.33 to estimate a month.
How to bring your fuel budget down
Combine errands, keep tires properly inflated and compare local fuel prices. Your actual savings depend on how you drive. You can also calculate the cost of an individual trip.
Frequently asked questions
How much should I budget for gas each month?
Multiply your average weekly miles by 4.33, then divide by MPG and multiply by the price per gallon.
How do I calculate monthly gas cost from weekly mileage?
There are about 4.33 weeks in an average month. Multiply weekly miles by 4.33 before calculating fuel use.
Does it work if I drive for work?
Yes. Include your work miles in your weekly total, but check your employer’s reimbursement rules separately.
What if gas prices go up?
Try a higher price in the calculator to see how much extra to set aside.
How can I reduce my fuel budget?
Combine trips, check tire pressure and avoid unnecessary idling. Your results will vary.