Fuel Cost Calculator
Estimate trip fuel cost from distance, MPG, and gas price. Split costs per passenger and compare MPG what-ifs — free, instant driving math.
Reviewed / updated August 4, 2026
Your inputs
Use highway MPG for long trips if your car lists both city/highway
Result
Estimated fuel cost
$39.43
11.4 gallons
- Gallons needed
- 11.43
- Cost per mile
- $0.12
- Per person
- $39.43
Fuel for this trip is about $39.43 (11.4 gal). Pump price is near a static US average benchmark of ~$3.45/gal.
MPG what-if
| MPG | Gallons | Cost |
|---|---|---|
| 24 | 13.3 | $46.00 |
| 28 | 11.4 | $39.43 |
| 32 | 10.0 | $34.50 |
Suggested next steps
- Efficient highway MPG helps — refine it from fill-ups with the Gas Mileage / MPG Calculator.
- Split cost with passengers using the per-person figure when you’re ridesharing.
- Round-trip? Double the distance (or run the calculator twice) for a full outing.
How the fuel cost calculation works
- Gallons = trip miles ÷ miles per gallon
- Total fuel cost = gallons × price per gallon
- Cost per mile = total ÷ miles
- Per person = total ÷ number of people splitting the tank
A small what-if table shows cost at MPG a bit lower and higher than your input so you can see sensitivity. Rule-based tips compare your pump price with a static US average benchmark and suggest efficiency checks when MPG is low.
Worked example
Distance 320 miles, 28 MPG, gas $3.45/gallon, 2 people:
- Gallons = 320 ÷ 28 ≈ 11.43
- Cost = 11.43 × 3.45 ≈ $39.43
- Per mile ≈ $0.12
- Per person ≈ $19.72
If MPG were 24 instead of 28, gallons rise to ~13.3 and cost rises to ~$46 — the scenario table highlights that jump.
Methodology and notes
All math runs in your browser. MPG varies with speed, load, weather, and maintenance. For fill-up-based efficiency math, use the Gas Mileage / MPG Calculator in this fuel cluster; for a fuller road-trip budget, open the Trip Cost Calculator.
Frequently asked questions
Gallons needed = distance ÷ MPG. Fuel cost = gallons × price per gallon. Cost per mile = total fuel cost ÷ distance. This calculator updates those figures as you type.
Related tools
Related calculators — live tools and upcoming pages for internal linking.
- EverydayGas Mileage / MPG CalculatorCalculate real-world MPG from miles and gallons. See L/100 km, cost per mile, and US average comparison.
- EverydayTrip Cost CalculatorEstimate road-trip cost: fuel, lodging, food, and other — then split per person. Free trip budget tool.
- EverydayAge CalculatorCalculate exact age in years, months, and days. See days lived and next birthday countdown. Free, instant, private.
- EverydayDate Difference CalculatorFind days, weeks, months, and years between two dates. Optional inclusive end day and weekday estimate.
- EverydayTime Zone ConverterConvert a date and time across world time zones for meetings and travel. Free, instant, browser-based.
- FinanceTip CalculatorCalculate tip and total bill instantly. Split the check, compare tip percentages, and get US tipping suggestions. Free, no signup.