Video Frame Rate & FPS Converter

Why Do Decimal Frame Rates Exist? (23.976 vs. 24 fps)

If you have ever wondered why cameras shoot at 23.976 fps, 29.97 fps, or 59.94 fps instead of clean integer numbers, the answer goes back to the introduction of NTSC color television in 1953. To implement color data into the existing black-and-white broadcasting signal without breaking older TV sets, engineers had to lower the frame rate by exactly 0.1%.

Today, this legacy remains standard in North America and Japan (NTSC standards), while Europe and most of Asia use clean frame rates based on the electrical grid frequency (PAL standard - 25 fps and 50 fps). Cinema production typically utilizes a true integer rate of 24.00 fps.

How to Calculate Video Frame Duration

When working with motion design, complex VFX, or subtitles, understanding the exact temporal length of a single video frame is critical. The duration of one individual frame can be calculated using a simple division formula:

For example, if you are working on a PAL broadcast timeline at 25 fps, each frame lasts exactly 40 milliseconds. However, if you switch to a cinematic 23.976 fps timeline, a single frame's duration increases to approximately 41.708 milliseconds. This tiny difference accumulates over time, which is why audio and video drift can occur if frame rate conversion is not performed precisely during post-production.

Common Video Frame Rate Conversion Reference Chart

When you force video files to conform to a new frame rate, it alters the clip duration and pitch. Use this reference grid for common standard conversions when adjusting speed percent in your video editing software (NLE):