How many rolls should you budget?

The ratio compares exposed picture frames with finished picture frames at the playback rate. Choose a film format, then deduct a reserve from each nominal roll.

Physical playback minutes, not timecode fields.
10 means ten exposed frames per finished frame.
Extra exposed pictures above the selected ratio.
Uses nominal frames per foot for the movement.
Applies to roll length and reserve.
Length of each roll in the selected unit.
Unusable length for loading, heads/tails and waste.
Determines elapsed camera recording time.
Defines the finished picture-frame requirement.

27Nominal rolls required
9,900.000 ftRequired exposed footage
10,800.000 ftTotal nominal footage to buy
158,400Required exposed picture frames
01:50:00.000Elapsed camera recording time
6,080 framesUsable picture capacity per roll

35 mm 4-perf · 24 fps capture / 24 fps playback. Buy 10,800.000 ft / 3,291.840 m nominally; expose 9,900.000 ft, with 20 ft reserved per roll. Recording time is elapsed HH:MM:SS.milliseconds.

Budget pictures, then complete rolls.

finished frames = ceil(minutes × 60 × playback fps)
required frames = ceil(finished frames × ratio × (1 + allowance / 100))
roll capacity = floor((roll feet − reserve feet) × frames per foot)
rolls = ceil(required frames / roll capacity)

ceil rounds up; floor rounds down. The planner covers the requested finished duration with whole pictures, adds the ratio and shooting allowance, then rounds the purchase up to whole rolls. Required exposed footage is required frames divided by the nominal factor.

The factors are 40 frames/ft for 16 mm and Super 16, 32 for 35 mm 2-perf, 64/3 for 3-perf, and 16 for 4-perf. Retain the fraction for 3-perf. Feet convert using exactly 1 ft = 0.3048 m.

Check the allowance against the plan.

Calculated examples at 24 fps capture and playback; 400 ft rolls with 20 ft reserve
Finished duration / ratio / extraFormatRequired frames / exposed feetRolls
1 min / 5:1 / 10%35 mm 4-perf7,920 / 4952
10 min / 10:1 / 10%35 mm 4-perf158,400 / 9,90027
10 min / 10:1 / 10%35 mm 3-perf158,400 / 7,42520

The 3-perf roll holds floor(380 × 64/3) = 8,106 whole frames. Additional shooting allowance buys extra intended pictures; per-roll reserve removes unusable length. Keep those two assumptions separate to avoid budgeting the same loss twice.

Keep camera time distinct from playback.

Required frames divided by camera fps gives recording time. Recording the default 158,400 frames at 48 fps takes 55 minutes; playback at 24 fps lasts 110 minutes. Changing camera speed alone does not change this frame-based shooting ratio.

Fractional rate labels use 24000/1001, 30000/1001 and 60000/1001. Nominal rolls and reserves are planning inputs: confirm loading losses and actual stock with the camera department. For more detail, use the film footage guide and film-roll runtime estimator.

Technical references

Examples use the stated nominal factors and rounding rules. The planner does not quote film-stock prices or guarantee usable magazine capacity.