Frame Rate Duration Converter
Convert video duration between source and playback frame rates, including total frames, conformed duration and speed percentage.
Convert frame rate and clip duration
Calculate total frames, source duration and retimed playback duration when frame rate changes.
How the Frame Rate Duration Converter works
The converter first calculates total captured frames as recorded duration × source frame rate. If those same frames are interpreted at a different playback frame rate, playback duration becomes total frames ÷ target frame rate. Playback speed relative to real time is target fps ÷ source fps.
How to use this frame rate duration converter
Enter the actual recorded duration and source frame rate, then choose the frame rate at which the existing frames will be played. This is especially useful for 60 fps or 120 fps slow motion conformed to 24/25/30 fps, and for image-sequence or timelapse workflows where frame count is more reliable than clip metadata.
How to interpret the result
A duration multiplier above 1 means the conformed clip becomes longer, while a speed below 100% indicates slow motion. If the target rate is higher than the source rate, the clip becomes shorter and plays faster when no new frames are synthesized. The total frame count stays constant in this model.
Assumptions and limitations
The calculation assumes simple frame-rate reinterpretation. Editing software may instead drop, duplicate, blend or synthesize frames. NTSC rates such as 23.976 and 29.97 should be entered with their actual decimal values when precise timing matters. Drop-frame timecode changes counting labels, not the underlying playback rate itself.
Practical example and workflow
Ten seconds captured at 60 fps contains 600 frames. Conforming those frames to 24 fps produces a 25-second clip at 40% of real-time speed. This lets an editor check the usable slow-motion duration before placing the clip into a timeline.