I don't have access to a track for workouts but I have a track workout coming up. Would running the perimeter of a soccer field be 400m?
Track substitute?
Report Thread


No. Soccer fields fit inside of tracks.

Interesting post on Tracktalk about this last spring. Poster left detailed instructions of how to lay out a grass track using things that could be found at the Hardware store. There are diagrams to help promote layout efficiency.
https://tracktalk.net/t/200mtrackinapack/24974
The poster's idea was to fit all the tools in a backpack and call it Track in a Pack. 
If it's an Olympicsize soccer field, you'd be 1080m short.
If it's a normal highschoolsize soccer field, it would be a quite bit shorter, since the distance across the short side of a soccer field is the diameter of the circumference of the curve of the track. Circumference = 2πr but since the curve on a track is a semicircle its circumference is πr, where r is half the width of the soccer field. The curve is 100m, so 100m = πr and that means that r = ~33m. If you run as far to the outside of the field as possible (meaning that the length of the field would be ~100m), the distance for one lap around the field would be ~266m. This also means that if you run a lap and a half around the field, it would be ~400m. 
For me, 400 meters was the distance around the field track. This track has a larger circumference