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Frame Rate Converter

Runtime and audio pitch change when you conform footage to a different frame rate.

Conformed result

New runtime8:00 (mm:ss) — was 10 m 0 s
8 m 0 s
Playback speedPlays faster
+25.00%
Audio pitch shiftDown 3.9 semitones with a straight speed conform
-3.86 semitones
Frame countUnchanged — conform keeps every frame
14,400

How it's computed: a conform keeps the frame count and changes only playback speed, so new runtime = old runtime × source fps ÷ target fps. Pitch shift = 12 × log₂(source ÷ target) semitones.

Same job, one API call

Runs in your browser — nothing is sent anywhere.

Read the API docsGet a free API key

Questions

What happens when 24 fps footage goes into a 30 fps timeline?

A straight conform plays it 25% faster — runtime shrinks and audio pitch rises about a minor third. Editing software usually re-times or blends frames instead; this calculator shows the conform case.

Does conforming change the audio too?

Yes — a straight conform speeds or slows audio with the picture, and pitch moves with speed. The calculator reports the pitch change alongside the runtime change.

When is a straight conform the right tool?

When matching footage to a delivery spec — say PAL 25 fps slowed to 24 for a film-out. To keep real time, frame blending or optical flow is the better tool.

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