Slow Motion Duration Calculator
Slow motion happens when footage shot at a high frame rate plays back at a normal one. This shows how long the slowed clip will run, and how many times slower it looks.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
Divide the recording frame rate by the playback frame rate to get how many times slower the clip plays.
Multiply the length you filmed by that same number. A clip shot at a high rate and played at a normal rate runs that many times longer.
Worked example
Footage shot for 4 seconds at 240 frames per second, played at 24 frames per second, runs for 40 s, about 10 times slower.
Questions
What frame rate should I film at?
Many phones and cameras offer 120 or 240 frames per second for slow motion. Pick the highest rate your camera supports for smoother slow footage.
Why does the slowed clip look jerky?
Slow motion stretches the footage you recorded. A lower recording rate or very fast movement can look choppy, so try a higher rate.
Does the sound slow down too?
Usually not. Most cameras record sound at normal speed, so slow clips are often muted or have music added.
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