semkuGas cost calculator
Enter distance, fuel economy and fuel price to estimate the trip's fuel cost.
Convert distance and volume with the Measurement converter.
Calculation rules
Fuel needed is distance / mpg, distance × L/100 km / 100, or distance / km/L after matching units; fuel cost is fuel needed × your entered unit price. Round trip doubles the distance, cost per person divides by the entered people, monthly cost multiplies by the entered trip count, and yearly cost is monthly cost × 12.
One mile is exactly 1.609344 km and one US gallon is exactly 3.785411784 L; mpg uses US gallons. Calculate before rounding each displayed value once to two decimal places, with ties away from zero; each person's share is rounded separately, so the displayed shares may not add up to the trip total.
Fuel prices are entered by you; the calculator does not retrieve live or average prices, and optional monthly totals stay hidden when no trip count is entered.
This distance-and-fuel-economy estimate does not model idling, traffic or route elevation and includes fuel cost only.
Frequently asked questions
- How much fuel and money does a 420-mile trip take at 28 mpg and $3.50 a gallon?
- One way uses 15.00 US gal, or 56.78 L, and costs $52.50 with those inputs.
- Can I mix kilometers, mpg and a price per liter?
- Yes. Distance, fuel economy and price units are converted before calculating; mpg always uses US gallons.
- What should I enter for a round trip?
- Enter the one-way distance and choose Round trip; each trip in the optional monthly count then includes both directions.
- Why do four shares of $13.13 exceed a $52.50 total?
- Each exact share is $13.125 and rounds to $13.13, so the displayed shares add to $52.52 while the trip total remains $52.50.
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For details, see the privacy policy in Korean.
Calculations run in your browser without sending your calculation inputs or results to the server. See “Privacy on this page” for information about access data.