Since 1921, the IAAF has stated that a marathon's distance is standardized at 42.195K or 26 miles and 385 yards.
If you are using a standard 400M track, and running exclusively in lane 1, then you will need to complete 105.4875 laps in order to complete a marathon or essentially 105 and 1/2 laps.
If you use an outer lane, then you will not need to run as many laps.
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A marathon = 26 miles 385 yards = 26385/1760 =26.2188 miles (4dp).
A half marathon measures 13.1094 miles.
Depends on the length of the track. A half marathon is 13 miles. It it's a quarter mile track, that's 52 times around...