Film Length Calculator
Convert film length to running time and back, in Super 8, 8 mm, 16 mm, Super 16, 35 mm 2, 3 or 4-perf and 65 mm, with frames, timecode and number of rolls.
Running time
Rolls
| Roll | Time per roll | Rolls needed |
|---|
Frames per foot: 16 for 35 mm 4-perf (64 perforations per foot), 21.33 for 3-perf, 32 for 2-perf, 40 for 16 mm and Super 16, 72 for Super 8, 80 for standard 8 mm, 12.8 for 65 mm 5-perf. Times exclude leaders and loading waste.
Everything is computed in your browser: nothing is uploaded.
About this tool
The film length calculator converts a length of film stock into running time, and a running time into footage, for film formats: Super 8, standard 8 mm, 16 mm, Super 16, 35 mm 4, 3 or 2-perf, 65/70 mm 5-perf and IMAX. It also gives the number of frames, the timecode and the film speed in feet and metres per minute.
Choose the format and frame rate (16, 18, 24, 25 fps or another), then enter a length, a number of frames or a duration: the other values are calculated at once. The rolls table shows how long common rolls last (50, 100, 400, 1000 ft…) and how many rolls your shoot needs.
- Super 8, 8 mm, 16 mm, Super 16, 35 mm 2/3/4-perf, 65 mm, IMAX
- Length in feet or metres
- Running time, frame count and timecode
- Any frame rate: 16, 18, 24, 25 fps or other
- Time per roll and number of rolls needed
- Film speed in ft/min and m/min
How to use it
- Choose the film format and frame rate.
- Enter a length, a number of frames or a duration.
- Read the running time, timecode and film speed.
- Check the rolls table to plan your stock order.
Frequently asked questions
How long is a 400 ft roll of 16 mm?
At 24 fps, 400 ft of 16 mm (40 frames per foot) runs about 11 minutes 7 seconds; at 25 fps, 10 minutes 40 seconds.
How many frames per foot in 35 mm?
16 frames per foot in 4-perf, 21.33 in 3-perf and 32 in 2-perf, because a foot of 35 mm has 64 perforations.
And Super 8?
Super 8 has 72 frames per foot: a 50 ft cartridge runs about 3 min 20 s at 18 fps and 2 min 30 s at 24 fps.
Are leaders included?
No, the calculation uses the usable length; allow a margin for leaders and loading.