Trip mileage is distance traveled. MPG is fuel economy. Calculate distance first, then use it as an input to a separate fuel estimate.
A MapQuest Mileage Calculator search can mean two different things: finding the road distance between places or adding the mileage of an entire trip. A route planner can supply the first kind of estimate. The independent calculator here handles the second by adding the distances you enter for each leg.
It does not geocode addresses or measure a line on a map. Obtain leg distances from the routes you plan to drive, then enter them in one consistent unit. This keeps the total transparent, particularly when the journey includes local detours or a return along different roads.
Add up your trip distance
Example legs are prefilled. Replace them with road distances from your chosen routes.
201.17 kilometres
Distances are entered manually. This adds legs; it does not calculate a road route. If your return differs, include it in the entered distance and leave the return option off.
Use road distance rather than straight-line distance
A road route follows available connections. Rivers, mountains, limited crossings, and one-way streets can make it considerably longer than the direct line between two points. Measuring the separation between town centers will not reliably tell you how far the vehicle will travel.
Use exact endpoints for each leg and apply the same road preferences when comparing alternatives. A route to a hotel entrance can differ from a route to the center of its postcode. Keep the chosen route alongside the distance so you know what each number represents later.
Add separate legs without double-counting
Split the journey at places where you stop or change the itinerary. For a drive from home to a pickup point and then to a venue, record home-to-pickup and pickup-to-venue. Do not also add home-to-venue if that distance already describes the same travel. The calculator sums entered legs, so overlapping entries will inflate the result.
As a worked example, three legs of 42, 18, and 65 miles total 125 miles. If local errands add another 12 miles, the planned total is 137 miles. This is distance, not fuel consumption or an expense allowance. You can pass it to a fuel-cost calculation after the mileage is settled.
Total trip mileage = first leg + second leg + remaining legs
Handle the return journey explicitly
Doubling the outward distance is convenient only when you expect the return to cover approximately the same distance. In the calculator, the same-distance return option doubles the sum of all listed legs. Use it for a simple out-and-back estimate, not for a loop that already includes travel home.
If the outward trip is 125 miles and the return takes a different 132-mile route, enter both as separate legs and leave the doubling option off. The total is 257 miles. Adding local travel to that total is clearer than applying a general percentage and forgetting what it was intended to cover.
Convert units after you have a consistent total
One mile equals 1.609344 kilometres. Multiply miles by that factor to obtain kilometres, or divide kilometres by it to obtain miles. The calculator displays both units after summing the distances you provide. All entries must use the unit selected above the fields.
For example, 125 miles is 201.168 kilometres, displayed as 201.17 when rounded to two decimal places. This display precision does not mean the route itself is accurate to a hundredth of a kilometre. Rounding is an arithmetic choice; map data, routing choices, and actual driving introduce their own differences.
Kilometres = miles × 1.609344
Distinguish planned mileage from actual travel
A planned total is useful for comparing itineraries. An odometer reading records the distance the vehicle actually covered, including missed turns, parking searches, and unplanned stops. Keep both when the difference matters. Do not silently replace actual travel with the route estimate and describe the result as measured mileage.
For an expense record, retain the date, purpose, start and finish, and the distance method used. Follow the rules of the organization receiving the record. This article does not supply tax rates, establish eligibility, or determine reimbursement; those questions are separate from adding route distances.
Common questions
Is mileage the same as miles per gallon?
No. Trip mileage measures distance. Miles per gallon measures the distance traveled per unit of fuel. They answer different questions even though both use the word “miles.”
Why does my odometer disagree with the map?
You may have driven a different route, taken detours, or covered additional distance around stops. Compare the actual journey with the selected route before treating the difference as a calculation error.
The formulas, assumptions, and worked examples are explained on this page. These are independent planning estimates, not official MapQuest tools or measured travel results.