Film Footage & Runtime: Printable Reference

Nominal footage factors

Nominal footage factors
Film format	Frames/ft	Feet/min at 24 fps
16 mm / Super 16	40	36
35 mm 2-perf	32	45
35 mm 3-perf	64/3	67.5
35 mm 4-perf	16	90

A 400 ft roll at 24 fps, no reserve

A 400 ft roll at 24 fps, no reserve
Format	Whole frames	Recording duration
16 mm / Super 16	16000	11 min 6.667 s
35 mm 2-perf	12800	8 min 53.333 s
35 mm 3-perf	8533	5 min 55.542 s
35 mm 4-perf	6400	4 min 26.667 s

Calculate in this order

Usable length = roll length - chosen reserve, in the same unit. One international foot = 0.3048 metre exactly.
Whole picture capacity = floor(usable feet x nominal frames/foot). Retain 64/3 for 3-perf until the final floor; do not use 21.33.
Recording seconds = whole frames / camera fps. Playback seconds = the same frames / playback fps.
Example: 400 ft of 4-perf at 96 fps lasts 66.667 seconds in the camera. Its 6400 pictures play for 266.667 seconds at 24 fps.

References and assumptions

Read the full guide for context and further primary references. These are explanatory planning references, not a replacement for the job's delivery requirements.