Frame Rate Conversion Calculator

Work out frame rate conversion instantly with clear inputs, formula shown and shareable results.

About Frame Rate Conversion Calculator

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.

Formulas

Slow motion factor

factor = source fps / timeline fps

New clip length

length = original seconds x source fps / timeline fps

Worked example

With the default values below, Frame Rate Conversion Calculator returns Slow motion factor when conformed of 2.500. Change any input above and every figure here is recalculated in your browser.

Inputs used

Recorded frame rateminimum 1 fps: 60 fps
Timeline frame rateminimum 1 fps: 24 fps
Clip length as recordedminimum 0.01 s: 10 s

Results

Slow motion factor when conformed: 2.500 x
Clip length on the timeline: 25.000 s
Playback speed if frames are dropped: 0.4000 x
Frames in the clip: 600

Step by step

1Values used
2Slow motion factor
3New clip length
4Slow motion factor when conformed= 2.500 x
5Clip length on the timeline= 25.000 s
6Playback speed if frames are dropped= 0.4000 x
7Frames in the clip= 600

Assumptions and limits

The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Frame Rate Conversion figure worked out?

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.

Why does this matter?

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.

What do I need to enter?

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.