Free · Measurement and planning

Film Footage Frames and Running Time

Convert film footage, frame counts, frame rate and elapsed running time, including continuous 400 ft and 1,000 ft roll equivalents.

Calculator inputs

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Enter the known values in the units shown. Results update as you type.
Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
Use the worked example to check the method. Reset restores the starting fields.

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

For the worked example, frames = 14400.00000, run_time = 600.0000000, ft_1000 = 0.9000000000, ft_400 = 2.250000000.

Frames = footage feet × frames per foot; duration = frames / frame rate.

Enter these known values and leave the other values blank.

Film format determines frames per foot. Roll counts are continuous length equivalents, not rounded purchase quantities.
35 mm 3-perf retains the captured approximation 21.33 frames/foot; choose an exact supported format for exact footage planning.
Results follow the stated ideal arithmetic model. Display rounding does not change the underlying calculation.
Supply sufficient known values and leave the desired quantity blank. Controls retain captured inverse branches and units.
If a retained lock prevents a reverse calculation, unlock the quantity you want to solve before supplying the known values.

Frames = footage feet × frames per foot; duration = frames / frame rate.

Available selectors convert the entered physical quantity. Use compatible units for all related quantities.

A missing input, invalid denominator or underdetermined relationship cannot provide a unique finite result.

Use exact-sign physical domains, exact discrete counts where applicable, and documented model bounds. Source arithmetic is preserved.