Google Maps shows fuel cost estimates during route planning, but only if you set it up first

Google Maps can display how much fuel a trip will cost before you drive. The app calculates this by taking the route distance, your car's fuel economy, and current gas prices in your area. You see the estimate right on the map alongside distance and time — but the feature is off by default, and you have to tell Google what kind of car you drive and how many miles per gallon it gets.

The estimate appears only on Android phones and only when you search for a route in a personal car (not public transit or rideshare). The number updates based on real gas prices Google pulls from public sources, so it changes as fuel costs rise or fall. This is useful if you are comparing routes or trying to budget for a long drive, but it is not a substitute for checking your actual fuel gauge before you leave.

Key Takeaways

  • You must enter your vehicle type and fuel economy in Google Maps settings before cost estimates will show up on any route.
  • The estimate appears on Android only, displayed alongside the distance and time for each route option.
  • Google pulls current gas prices from public data sources, so the estimate updates as fuel prices change in your area.
  • The calculation assumes you drive the entire route at normal highway or city speeds — it does not account for traffic delays or detours.
  • Fuel cost estimates work best for comparing routes or planning long trips, not for real-time fuel budgeting during daily driving.

How to turn on fuel cost estimates in Google Maps

Open Google Maps on your Android phone and tap your profile picture in the top right corner. Select Settings, then scroll down and tap Navigation settings. Look for the section labeled Fuel or Fuel price estimate — the exact wording varies by phone and app version.

Tap the toggle to turn it on. Google will then ask you to enter your vehicle type (sedan, SUV, truck, or electric vehicle) and your car's fuel economy in miles per gallon. If you are not sure of your MPG, check your car's manual, look it up on fueleconomy.gov using your year and model, or estimate based on your recent fill-ups by dividing miles driven by gallons purchased. Once you save these settings, fuel cost estimates will appear on every route you plan.

Where the fuel cost estimate shows up on your route

When you search for a destination and Google shows you multiple route options, the fuel cost appears in small text below the distance and time for each route. For example, you might see "45 miles · 52 min · $6.50 fuel" on one option and "48 miles · 58 min · $7.10 fuel" on another. The estimate is there to help you compare — the shorter route is not always the cheapest if it has more highway miles or if traffic makes it take longer.

The fuel cost updates in real time as you change your destination or as gas prices shift in your area. If you search the same route a week later, the estimate may be higher or lower depending on what happened at the pump. Google does not show you the gas price it used for the calculation, so you cannot see whether it is using today's price or an average.

How Google calculates the fuel cost estimate

Google multiplies three numbers: the route distance in miles, your car's fuel economy in miles per gallon, and the current average gas price in your area. So a 50-mile route in a car that gets 25 MPG, with gas at $3.50 per gallon, would be calculated as (50 ÷ 25) × $3.50 = $7.00. The math is straightforward, but the accuracy depends on whether your MPG number is realistic for how you actually drive.

The gas price Google uses comes from public data sources, usually aggregated from gas station reports and pricing services. This means the estimate reflects average prices in your region, not the exact price at the station where you will fill up. If you live in an area where gas prices vary widely between neighborhoods or stations, the estimate may be off by a dollar or two. The estimate also assumes you drive the entire route at a steady pace — it does not account for sitting in traffic, which burns fuel without moving, or for aggressive acceleration and braking, which both increase fuel use.

Why your actual fuel cost might differ from the estimate

The estimate is a starting point, not a may provide. Real fuel cost depends on how you drive, the actual gas price you pay, and whether you take the exact route Google planned. Idling in traffic, using air conditioning, carrying heavy cargo, and driving on hilly terrain all increase fuel consumption beyond what the EPA fuel economy rating assumes. If you drive aggressively or in stop-and-go city traffic, your actual MPG will be lower than the number you entered, and your real cost will be higher.

Gas prices also vary by station and by day. Google's estimate uses regional averages, so you might find cheaper gas at a station off your route or more expensive gas at the only station nearby. If you are planning a long road trip, it is worth checking gas prices along your route using GasBuddy or asking locals where to fill up cheaply. For daily commutes, the estimate is less useful because the variation from day to day is small.

Comparing fuel costs between different routes

The main value of the fuel cost estimate is comparing your options. If Google shows you three routes to the same place, the fuel cost helps you see which one is most efficient. A longer route that avoids highways might cost more in fuel than a shorter interstate route, even if it saves time. A route through the city might have lower fuel cost than a highway route if the city route is much shorter, even though it takes longer.

When you are deciding between routes, look at the total cost, not just the distance. A route that is 5 miles longer but avoids a congested highway might use less fuel overall because you are not sitting still burning gas. Google's estimate helps you make that comparison without doing the math yourself. For trips you take regularly, you can test the estimate against your actual fuel use over a few weeks and adjust your MPG number if needed.

Fuel cost estimates on iPhone and other devices

Google Maps on iPhone does not currently show fuel cost estimates, even if you enter your vehicle information. The feature is Android-only as of now. If you use an iPhone, you can get similar information from Apple Maps, which also shows fuel cost estimates if you set up your vehicle in the Maps settings. The calculation works the same way — distance, MPG, and regional gas price — so the estimates should be similar between the two apps.

If you use Google Maps on a computer or tablet, fuel cost estimates do not appear there either. The feature is designed for the phone app because that is where you are most likely to be planning a trip right before you drive. If you want to see estimates on a computer, you can look up the route distance and calculate it yourself using the formula above, or use a dedicated fuel cost calculator website.

Frequently Asked Questions

Does Google Maps use real-time gas prices or averages?

Google uses regional average gas prices from public data sources, not real-time prices at individual stations. The price updates throughout the day, but it reflects the average in your area, not the exact price where you will fill up. For the most current price at a specific station, check GasBuddy or call the station directly.

What if I don't know my car's fuel economy?

Check your car's owner manual, look up your year and model on fueleconomy.gov, or calculate it yourself by dividing the miles you drove by the gallons you used at your last few fill-ups. If you are unsure, start with the EPA estimate for your vehicle and adjust it down slightly if you mostly drive in the city, since city driving uses more fuel than highway driving.

Can I see fuel cost estimates for electric vehicles?

Yes, if you select "electric vehicle" as your vehicle type, Google Maps will show electricity cost instead of fuel cost. The calculation uses your vehicle's efficiency in miles per kilowatt-hour and current electricity rates in your area. The estimate works the same way as gasoline, but the numbers reflect charging cost rather than fuel cost.

Why is the fuel cost estimate different from what I actually spent?

The estimate assumes steady driving at normal speeds and uses your entered MPG, which may not match your actual driving. Traffic, aggressive acceleration, air conditioning use, and carrying extra weight all increase fuel consumption. Also, the gas price you pay at the pump may differ from Google's regional average. Over many trips, the estimate should average out to be fairly close to reality.

Does the fuel cost estimate include tolls?

No, the estimate shows only fuel cost, not tolls, parking, or other trip expenses. If your route includes toll roads, you will need to add that cost separately. Google Maps can show you which routes have tolls if you turn on that setting, but the fuel estimate does not include them.