Fuel Cost Calculator
Real numbers for drivers, owner-operators, and small fleets. Change any input — your results and the URL update live, so you can save or share your scenario.
Auto-calculate weekly miles
Enter a US ZIP (e.g. 43555) or Canadian postal code (e.g. K1A 0B1).
Optional
Your estimated fuel cost
$182 / month
Per week
$42
Per year
$2,184
Cost per mile
$0.14
Gallons used per week
12 gal
Effective price $3.50 / gal
Annual fuel card savings
$0
Add a discount or cash-back to see savings
Save 5¢/gal
4.3
extra miles
Save 10¢/gal
8.6
extra miles
Save 15¢/gal
12.9
extra miles
Save 25¢/gal
21.4
extra miles
Driving 1,000 miles at 25 MPG with gas at $3.50/gal uses 40 gallons and costs about $140 — that's 14¢ per mile. The same 1,000 miles in a 6.5-MPG semi at $3.90/gal diesel uses ~154 gallons and costs about $600 (60¢/mile). Fuel cost = miles ÷ MPG × price per gallon.
Assumptions this tool makes: monthly cost = weekly cost × 4.345 (average weeks per month); annual = weekly × 52; a fuel-card discount reduces the effective price per gallon before cashback percentage is applied; and MPG is treated as constant across the period. Terrain, idling, load, and weather all move real-world MPG — use your logged average, not the window sticker.
- How much does it cost to drive 1,000 miles?
- Divide 1,000 miles by your MPG to get gallons, then multiply by your price per gallon. At 25 MPG and $3.50/gal, 1,000 miles uses 40 gallons and costs about $140. A 40-MPG car cuts that to roughly $88; a 6.5-MPG semi at $3.90 diesel spends about $600.
- How do I calculate my weekly fuel cost?
- Weekly miles ÷ MPG × price per gallon. If you don't know your weekly miles, enter your start and destination ZIP codes above and the calculator will measure the route distance and multiply it by your trips per week.
- How much does an MPG improvement actually save?
- It scales with miles and price: savings = miles × price × (1/old MPG − 1/new MPG). Going from 25 to 28 MPG at 15,000 miles/yr and $3.50/gal saves roughly $225 a year. The 'What better MPG is worth' table computes this for your exact inputs.
- Do fuel card discounts change the math much?
- At volume, yes. A cents-per-gallon discount applies to every gallon: 6¢/gal on 500 gallons a month is $30/month before fees. Enter your discount or cashback in the Optional section — then net it against any card fees with the fuel card savings calculator.
Editorial disclaimer: these are estimates, not financial advice. Actual costs vary with driving style, terrain, idling, vehicle condition, regional taxes, and fuel-card terms. Verify against your own receipts before making a financial decision.