Work out frame rate conversion instantly with clear inputs, formula shown and shareable results.
Conforming footage plays every recorded frame at the timeline rate, so the clip stretches by source over target; dropping frames instead keeps the length and changes nothing visually except smoothness. 60 fps conformed to 24 fps gives 2.5 times slow motion, which is why shooting rate has to be chosen before the shoot rather than fixed later.
Slow motion factor
factor = source fps / timeline fps
New clip length
length = original seconds x source fps / timeline fps
factor = source fps / timeline fps. Conforming footage plays every recorded frame at the timeline rate, so the clip stretches by source over target; dropping frames instead keeps the length and changes nothing visually except smoothness.
60 fps conformed to 24 fps gives 2.5 times slow motion, which is why shooting rate has to be chosen before the shoot rather than fixed later.
Enter recorded frame rate, timeline frame rate, clip length as recorded. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.