Trip Fuel Cost Calculator
Estimate gas cost for a single trip from distance, MPG, and fuel price. Edit the defaults to match your car and local prices.
Your inputs
These are editable defaults, not live market rates.
Defaults last set: 2026-07
Editable default — not a live API price
Estimated costs
This trip costs about $37.50 in fuel
Trip fuel cost
$37.50
Gallons needed
10.71
Cost per mile
$0.13
Fuel cost along the trip
Over 300 miles, cumulative fuel cost is about $37.50.
Assumes constant MPG and gas price along the trip — not traffic, elevation, or price changes.
Gas prices vary by region and time. Results are estimates for comparison only — not financial advice.
How we calculate
Gallons needed = distance ÷ MPG. Trip fuel cost = gallons × price per gallon. Cost per mile = price per gallon ÷ MPG.
The trip chart plots cumulative fuel cost from mile 0 to your distance, assuming constant MPG and gas price along the trip — not traffic, elevation, or price changes.
Prices are editable defaults, not live market rates. Results are estimates for comparison only — not financial advice.
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Frequently asked questions
- Are these live gas prices?
- No. The calculator uses an editable US default, not a live market API. Update the price to match your area.
- How is the estimate calculated?
- Gallons needed = trip distance ÷ MPG. Trip fuel cost = gallons × gas price per gallon. Cost per mile = gas price ÷ MPG.
- What does the trip chart show?
- It plots cumulative fuel cost from mile 0 to your trip distance, assuming constant MPG and gas price along the way. It is not a traffic or elevation forecast.
- Does this work for electric vehicles?
- This tool estimates gasoline trips only. For EV vs gas annual costs, use the EV vs Gas Cost Calculator.
- Can I share my estimate?
- Yes. Use the Copy link button to share a URL with your current inputs pre-filled.