Fuel Cost Calculator: Trip Cost & MPG Guide (2026)
Calculate fuel cost for any trip: gallons = distance ÷ MPG, cost = gallons × price. Full guide with towing, elevation, and hybrid vs gas comparisons.
Fuel Cost Calculator — Direct Answer
Fuel cost = (Distance ÷ MPG) × Gas Price. A 500-mile trip at 30 MPG and $3.50/gallon costs $58.33. Round trips double the cost. For a commute of 40 miles/day, monthly fuel cost at 30 MPG and $3.50 is roughly $140.
→ Calculate trip cost with our free fuel calculator
How to Calculate Fuel Cost
Every fuel cost problem uses the same three-input formula.
Gallons = Distance ÷ MPG
Cost = Gallons × Price Per Gallon
Where:
- Distance = total miles driven
- MPG = vehicle's miles per gallon
- Price = gas price per gallon
How to find your vehicle's MPG
Actual MPG (best): Track 3 fill-ups. Divide miles driven by gallons added.
EPA estimate: Check fueleconomy.gov or your owner's manual.
Rule of thumb:
- Compact sedan: 30–40 MPG
- Midsize sedan: 25–35 MPG
- SUV: 20–30 MPG
- Pickup: 15–22 MPG
- Hybrid: 40–55 MPG
- EV: 3–4 mi/kWh
How to adjust MPG for conditions
| Condition | MPG Impact |
|---|---|
| Highway | +15% vs city |
| City | −15% vs highway |
| Towing | −30% to −50% |
| Roof rack | −10% |
| AC on | −10% |
| Cold weather | −15% |
| Headwind | −10% |
Best practice: Use 10% below your highway MPG for realistic trip estimates.
How to apply to a real trip
Example: 500-mile road trip at 30 MPG, $3.50/gal
- Gallons = 500 ÷ 30 = 16.67
- Cost = 16.67 × 3.50 = $58.33 one-way
- Round trip = $116.67
Fuel Cost Chart by Distance and MPG
One-way cost at $3.50/gallon
| Distance | 20 MPG | 25 MPG | 30 MPG | 40 MPG |
|---|---|---|---|---|
| 100 mi | $17.50 | $14.00 | $11.67 | $8.75 |
| 250 mi | $43.75 | $35.00 | $29.17 | $21.88 |
| 500 mi | $87.50 | $70.00 | $58.33 | $43.75 |
| 1,000 mi | $175.00 | $140.00 | $116.67 | $87.50 |
| 2,000 mi | $350.00 | $280.00 | $233.33 | $175.00 |
Annual commute cost (240 workdays)
| Daily Round Trip | 25 MPG | 30 MPG | 40 MPG |
|---|---|---|---|
| 10 mi | $336 | $280 | $210 |
| 20 mi | $672 | $560 | $420 |
| 30 mi | $1,008 | $840 | $630 |
| 50 mi | $1,680 | $1,400 | $1,050 |
Cost per mile by vehicle type
| Vehicle | MPG | Cost/mile @ $3.50 |
|---|---|---|
| Compact sedan | 35 | $0.10 |
| Midsize sedan | 28 | $0.13 |
| SUV | 24 | $0.15 |
| Pickup | 18 | $0.19 |
| Hybrid | 48 | $0.07 |
| EV ($0.14/kWh) | — | $0.04 |
Common Fuel Cost Mistakes
Mistake 1: Using EPA highway MPG for real trips
EPA tests use ideal conditions — no AC, no cargo, no headwind.
Fix: Subtract 10% from EPA numbers for real-world estimates.
Mistake 2: Ignoring idle time
City driving with lots of stop-and-go drops MPG by 20–40%. Idling wastes fuel without moving.
Fix: Factor in 15% reduction for heavy city driving.
Mistake 3: Not including tolls and parking
Fuel is 70–85% of road trip cost. Tolls, parking, and food add the rest.
Fix: Budget 15–30% extra beyond fuel for total trip cost.
Gas vs Hybrid vs Electric Cost
5-year cost comparison (15,000 mi/year)
| Vehicle | Fuel Cost/Yr | 5-Year Total |
|---|---|---|
| Gas sedan (28 MPG) | $1,875 | $9,375 |
| Hybrid (48 MPG) | $1,094 | $5,469 |
| Electric (3.5 mi/kWh) | $600 | $3,000 |
| Pickup (18 MPG) | $2,917 | $14,585 |
Assumes $3.50/gal gas, $0.14/kWh electricity.
Break-even analysis
A hybrid costs $3,000–$5,000 more than the gas version. At $780/year fuel savings, break-even is 4–6 years.
Fuel Cost Calculator FAQ
How do I calculate fuel cost for a trip?
Gallons = Distance ÷ MPG. Cost = Gallons × Price. A 500-mile trip at 30 MPG and $3.50/gal costs $58.33 one-way.
How much does it cost to drive 1,000 miles?
At 30 MPG and $3.50/gallon: $116.67. At 20 MPG: $175. At 40 MPG: $87.50.
What is the cost per mile to drive?
$0.10–$0.20 per mile for fuel alone, depending on MPG and gas prices. Add $0.05–$0.10 for maintenance for total cost.
How much does a road trip cost?
A 1,000-mile road trip costs $100–$250 in fuel alone. Total road trip cost (fuel + tolls + food + lodging) is 3–5× fuel.
Does AC affect fuel economy?
Yes. AC reduces MPG by 5–15%, especially in city driving. On the highway, AC is more efficient than open windows.
Next Steps for Trip Cost Planning
- Fuel Cost Calculator — Trip cost by distance
- Mileage Calculator — Annual tracking
- Loan Calculator — Auto financing
- Auto Loan Guide — Full cost of ownership
- Interest Formulas — Loan math
Last updated October 2026. Gas prices vary by state and season — verify locally.