How long (in feet) and how many minutes will a given reel of 8mm, Super 8mm, or 16mm film run?

Reels of 8mm film, Super 8mm and 16mm film each have different lengths and run at different frame rates.  So, the answers depends on the diameter of the reel and the type of film.  8mm and Super 8mm typically are shown at 18 frames per second.  16mm film is typically shown at 24 frames per second.  Here is a table which shows the lengths and times depending on the size of the reel and the type of film.

Film Type / Reel Diameter and film length	3" (50ft)	4" (100ft)	5"​ (200ft)	6"​ (300ft)	7" (400ft)
8mm (18frames per second)	4min	​8min	​16min	​24min	​32min
Super 8mm ​(18frames per second)	3.5min	7min	14min	21min	28min
16mm (24frames per second)	1.5min	3min	6min	9min	12min