SlowMo Calculator

Calculate slow-motion playback duration when changing frame rates. See how long your clip becomes when you shoot high FPS and play back at 24, 25 or 30 fps.

Input

Accepts HH:MM:SS, MM:SS, SS or digits-only (HHMMSS).
Formula
Result seconds = (Source FPS × Clip seconds) ÷ Timeline FPS

Results

Timeline duration —
Seconds: — • Factor: — • Speed: — • Frames: —
Tip: This is the clip duration on your timeline if you conform/interprete the footage to the selected timeline FPS.
Tip 2: Click any result value to copy it.

History

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    How Slow Motion Works

    Bend Time Without Bending Your Brain

    Slow motion is simple math: you capture more frames per second than you play back. When you interpret/conform the footage to your timeline FPS, the same real-time action stretches out — smoothly and predictably.

    What this calculator does

    You enter Source FPS (how the camera recorded), your Clip length (real-time duration), and Timeline FPS (your playback rate). The tool returns the exact timeline duration after conforming.

    Quick rules of thumb

    • Slowdown factor: Source FPS ÷ Timeline FPS. Example: 120 → 24 is 5× slow motion.

    • Speed percentage: Timeline FPS ÷ Source FPS. Example: 24 ÷ 120 = 20% speed.

    Real-world example

    Record 10 seconds at 120 fps and conform to a 24 fps timeline:

    Result: 10s × (120/24) = 50 seconds on the timeline.

    DP tip

    If you shoot high FPS with a 180° shutter angle, your shutter speed gets faster (e.g., 120fps → ~1/240s). That means less motion blur. Great for crisp slow-mo, but it can look “choppy” if you expected creamy blur — so plan it on purpose.