Video FPS Calculator
Answer frame-rate questions in seconds. Calculate how many frames a clip has, how long a number of frames lasts, how long footage shot at 120 fps runs when played at 24 fps, and how much faster and higher-pitched a film becomes when converted from 24 to 25 fps. NTSC rates like 23.976 and 29.97 are handled with their exact fractional values.
- Runs in your browser
- No sign-up
- Free to use
Seconds or m:ss / h:mm:ss.
For slow motion and frame rate changes.
All results are exact arithmetic. NTSC rates such as 29.97 are 30000/1001; enter 29.97 or 23.976 and the exact value is used.
How to use Video FPS Calculator
- Choose what to calculate.
- Enter the frame rate.
- Enter the duration, frames or playback rate.
- Read the result and the formula.
Video FPS Calculator features
Frames ↔ duration
Both directions.
Slow motion
Factor and playback length.
Frame-rate changes
Speed and pitch change.
Exact NTSC rates
24000/1001, 30000/1001 …
Formula shown
Check every step.
Private
Runs in your browser; nothing is uploaded.
When to use Video FPS Calculator
- Planning slow-motion shots.
- Counting frames for animation and VFX.
- Converting films between PAL and NTSC.
- Checking frame-accurate edits.
Video FPS Calculator FAQ
Is 23.976 fps exactly 23.976?
No, it is 24000/1001 = 23.976023… The calculator uses the exact fraction when you enter 23.976 or 23.98.
How is slow motion calculated?
Factor = shooting fps ÷ playback fps. 120 fps played at 24 fps is 5× slower: 10 seconds of action last 50 seconds.
What is PAL speed-up?
Films shot at 24 fps were shown on 25 fps TV by playing every frame faster: 4.17% shorter and, without correction, about 0.7 semitones higher.
What about drop-frame timecode?
This calculator works in real time and frames; drop-frame is a timecode labelling scheme and does not change frame counts.
Do I need to enter hours?
No. Durations can be seconds, m:ss or h:mm:ss.
Frame rates in practice
Frame rate – frames per second – connects time and pictures. Film traditionally runs at 24 fps, European television at 25, American television at 29.97, and smooth video at 50, 59.94 or 60. High-speed cameras record 120, 240 or more frames per second for slow motion.
The basic relationship is simple: frames = duration × frame rate. The difficulty lies in the details. The NTSC rates are not round numbers but fractions with 1001 in the denominator, introduced when colour was added to American television. Over an hour, treating 29.97 as 29.97 instead of 30000/1001 is off by a fraction of a frame, but in long productions such errors add up, so the calculator uses exact values.
Slow motion works by playing high-frame-rate footage at a normal rate. Every recorded frame is kept, so time stretches by the ratio of the two rates. The calculator gives both the factor and the resulting duration.
Changing frame rate by playing every frame at the new rate changes speed and, unless corrected, audio pitch. That is how films reached PAL television, and it is why subtitles and running times differ between versions. The tool shows the speed change, the pitch shift in semitones and the time difference.
Results are calculated instantly in your browser.