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Slow Motion Calculator
Slow-down factor and final clip length from frame rates.
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How it works
Slow-down factor = recording fps ÷ playback fps, and the final clip length is the real action time multiplied by that factor. The 180° shutter rule suggests a shutter time of 1 ÷ (2 × recording fps), which gives natural motion blur. High frame rates need more light and fill cards faster. Example: Shooting at 120 fps for playback at 24 fps slows action 5×, so 5 seconds becomes 25 seconds.
FAQ
Is this calculator free?
Yes. No signup is needed and nothing you enter is stored.
Is the result exact?
Results are rounded for display. For financial, medical, or legal decisions, confirm with a professional.
Do my numbers leave my device?
No. The calculation runs in your browser.