Frame Rate Calculator

Every Frame Rate Is Really a Time Budget

A frame rate is just a count of images per second, but the number that actually constrains a video editor, game engine, or animator is the reciprocal: how many milliseconds each single frame gets. At 24fps you have nearly 42ms per frame; at 240fps you have barely 4ms. This calculator moves between frame rate, duration, and total frame count in any direction, so a target runtime or a captured clip's frame count converts cleanly.

The Formula

All three quantities are related by simple multiplication and division:

Frames = FPS × Duration (s)
Duration (s) = Frames / FPS
FPS = Frames / Duration (s)

Where This Calculation Matters

Video editing — converting a target runtime into an exact frame count for trimming, or checking how many frames a specific cut spans.
Animation and motion graphics — planning keyframe timing against a project's frame rate so motion lands on whole frames.
Game development — reasoning about how much processing time is available per frame at a target frame rate, and how many frames a fixed-duration effect needs.
Slow motion and high-speed capture — working out the playback duration of footage shot at a high frame rate and played back at a standard rate.

Time Budget per Frame at Common Rates

Duration of a single frame at standard video and gaming frame rates
Frame Rate	Time per Frame
24 fps (film)	41.667 ms
25 fps (PAL video)	40.0 ms
30 fps	33.333 ms
60 fps	16.667 ms
120 fps	8.333 ms
240 fps	4.167 ms

Doubling the frame rate always halves the time budget per frame — the relationship is inversely proportional, not linear.

How to Use This Calculator

Choose a mode: Frames from FPS & Duration, Duration from FPS & Frames, or FPS from Frames & Duration.
Enter Frame Rate (FPS) and Duration (seconds), or Total Frames, depending on which two values you already know.
Select Calculate to get the missing value.

Related Calculations

Need the file size a given frame rate and duration produce? Use the Video Bitrate Calculator. Working out pixel shape rather than timing? See the Pixel Aspect Ratio Calculator.