Gas Calculator
Estimate fuel use and trip cost from trip distance, vehicle efficiency, and fuel price.
Use it to budget road trips, compare vehicle types, or estimate commuting costs.
Result
--
Run the calculation to see the trip cost.
| Metric | Value |
|---|---|
| Adjusted MPG | -- |
| Fuel used | -- |
| Trip cost | -- |
| Cost per mile | -- |
Quick Answer
The calculator divides trip distance by fuel economy to get fuel used, then multiplies by fuel price to get trip cost.
How to Calculate
- Choose a vehicle type or keep the default fuel economy.
- Enter the trip distance and fuel price.
- Optionally adjust the passenger count for a per-person estimate.
- Click Calculate.
Formula
Fuel used = distance / fuel economy
Trip cost = fuel used x fuel price
Cost per mile = trip cost / distance
Worked Examples
Example 1: 250 miles at 30 mpg uses about 8.33 gallons.
Example 2: At $3.50 per gallon, that trip costs about $29.17.
Example 3: Splitting the cost between 2 people halves the per-person cost.
How to Interpret Your Results
| Output | Meaning | Action |
|---|---|---|
| Fuel used | Estimated fuel needed for the trip. | Use it to plan refueling. |
| Trip cost | Estimated amount spent on gas. | Use it to budget travel. |
| Cost per mile | Average cost for each mile driven. | Compare against other vehicles or routes. |
Frequently Asked Questions
Yes. Switch to kilometers and the calculator will convert the distance before estimating fuel used.
Different vehicles usually have different fuel economy, so the trip cost changes with the preset.
No. It only estimates fuel cost. Add taxes, tolls, and parking separately if needed.
Related Calculators
References
- OmniCalculator reference page
- Fuel use is estimated from trip distance and fuel economy.
- Last reviewed: March 2026.