Frame-rate conform calculator

Same frames. New playback rate.

This calculation preserves the whole frame count. It compares physical playback duration at the source rate and the new rate.

Speed and duration use different ratios.

Playing 1,440 pictures at 24 fps takes 60 seconds. At 25 fps those pictures take 57.6 seconds. Speed rises by approximately 4.1667%, while duration falls by exactly 4%. The percentages are inverse relationships, so a “4% speed change” is not a precise description of this conform.

The 23.976, 29.97 and 59.94 options mean 24000/1001, 30000/1001 and 60000/1001 fps. Calculations use those exact rates; only the displayed decimal results are rounded.

Common frame-preserving comparisons.

When the input is timecode, the source rate and counting mode first determine a frame count from the zero origin. The label’s seconds field is not assumed to be elapsed clock time. For a clip with a nonzero start, first find its length using the timecode duration calculator.

Carry the timing decision into the media tool.

This tool calculates a conform; it does not transcode or retime a file. A standards conversion that preserves programme duration needs a different frame-count or cadence decision. Read frame-rate conversion and film-to-digital delivery before choosing the actual processing method.

A frame-preserving picture conform changes running time. Plan the audio treatment with it: sync, any playback-rate change, and whether pitch should change or be corrected. Verify the processed picture and sound in the tool that performs the operation.

Timecode Pro’s native format comparisons follow their selected presets and established nominal-seconds behaviour. The physical playback seconds calculated on this page describe this specific frame-preserving operation.