Slow motion calculator: pick recording and playback fps (120fps at 24fps = 5x, 20% speed) to get the slow-down factor, playback speed and new clip length.
Professional video creators rely on slow motion calculator to ensure their content meets platform requirements and looks perfect on every device. Whether you're creating for TikTok, YouTube, Instagram, or other platforms, getting the right specifications is crucial for maximizing engagement and reach.
Our slow motion calculator provides instant, accurate results based on industry standards and platform guidelines. Save time, avoid trial-and-error, and create videos that perform better from the start.
Slow motion comes from recording more frames per second than you play back. The slow motion calculator divides the recording frame rate by the playback frame rate to get the slow-down factor, so 120fps played at 24fps is 5x slower, or 20% of real speed. It then multiplies your clip length by that factor: a 5-second 120fps clip becomes 25 seconds on a 24fps timeline.
Common pairs: 60fps at 30fps gives 2x (50% speed), 60fps at 24fps gives 2.5x (40%), 120fps at 30fps gives 4x (25%) and 240fps at 30fps gives 8x (12.5%). If the playback rate is higher than the recording rate the result is a speed-up instead, and the calculator labels it as fast motion.
Related calculators: frame rate converter, video length calculator and video file size calculator.
120 ÷ 24 = 5, so footage shot at 120fps and played on a 24fps timeline runs 5x slower, at 20% of real speed. A 2-second clip stretches to 10 seconds.
Record at twice your playback rate: 60fps for a 30fps timeline or 120fps for a 60fps one. For 25% speed, record at four times the playback rate, such as 120fps for 30fps.
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