Fuel Cost Calculator

Trip distance (miles) Fuel economy (MPG) Price per gallon ($)

Round trip (doubles the distance)

Fuel cost —

Gallons needed —

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Free fuel cost calculator — enter trip distance, fuel economy (MPG), and price per gallon to see exactly how much a trip will cost in gas.

How it works

Enter the trip distance, your vehicle's MPG, and the price per gallon
Toggle round trip to double the distance
See the total fuel cost and gallons needed instantly

Frequently asked questions

Where do I find my car's MPG?

Check your vehicle's manual or window sticker for the official EPA rating, or calculate your real-world MPG with the Gas Mileage Calculator using your actual fill-ups.

Does this account for tolls or parking?

No — this is fuel cost only. For a full trip cost breakdown including tolls, use a dedicated trip-cost tool alongside this one.

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From the blog

finance-calc

Forgetting to double the distance for a round trip is the easiest way to underestimate a road trip's gas cost

Plan a trip's fuel budget on one-way distance by mistake and the real cost comes as a surprise. A round-trip toggle removes that one common error.

2026-09-02

Update history

2026-09-02 Launched: fuel cost calculator with round-trip toggle. Entirely client-side.