Travel · official-source review · reviewed 2026-10-10
People budget hotels and food but forget to calculate gas, which can be the largest variable cost on a driving trip.
Estimate total gas cost from distance, your car's MPG, and current gas price.
People planning a driving trip and budgeting total cost.
Use the source document or official route that applies to your situation. This guide does not contact another person or verify external information.
Count one-way miles, then double it for a round trip.
Use your car's highway MPG from real driving, not the advertised number.
Use a gas price 10–20 cents above the local average for rural areas.
Compare the total driving cost to flights plus a rental car before you decide.
A 1,200 mile trip in a car getting 32 mpg at $3.60 per gallon costs about $135 round trip? Wait no — one way is $135, round trip double.
Use your own source and details. The example is not a record about a real person or organization.
U.S. Department of Energy and U.S. Environmental Protection Agency, FuelEconomy.gov · reviewed 2026-10-10
What this source supports: Official highway and combined MPG figures are published for all new and used vehicles.
Source limit: Real-world MPG varies with load, speed, and terrain. Budget with your own highway average.
These sources support the statements above. They do not show that every person needs this guide. They do not show a specific result.
This App estimates from the numbers you enter. It does not account for tolls, maintenance, or price spikes.
Real-world MPG varies with load, speed, and terrain. Budget with your own highway average.
Use current instructions from the responsible organization. This guide is a planning aid, not an official decision or a substitute for qualified advice.
Estimate total gas cost from total trip miles, your car's MPG, and gas price.
This estimates fuel cost only. It does not include tolls, maintenance, lodging, or food.
You enter every number yourself. The sources support the method and the limits. They do not produce a result for your specific case. Keep the original documents next to the sheet you build.
The App computes the worked example with your own numbers, in your browser.
APP 1
Estimate total gas cost from total trip miles, your car's MPG, and gas price.
Free · no account · no upload
Open Road Trip Gas Cost EstimatorThe App runs in this browser. It does not send or save entries. Copy, download, or print only when you choose.
This guide uses short, direct instructions as an ASD-STE100-style writing target. It is not a formal certification.
Companion App: Road Trip Gas Cost Estimator. It runs in this browser and does not upload your entries.
This guide is edited for clarity and checked against the sources it links. It is not a substitute for official instructions or qualified advice. A linked source does not show that every person needs this guide.