Frame Rate and Frame Count Calculator
Frames in a clip, how long one frame lasts, and what happens when you change the rate.
Results
The dashed line marks the value you entered.
What this tool does
Three questions with one answer between them. How many frames is this clip — that is just length times rate, and it is what an animator needs before drawing anything. How long is a single frame — one second divided by the rate, which is why 24 fps gives you 41.7 milliseconds per frame and 60 fps gives 16.7. And the useful one: if you shoot at one rate and play back at another, how long does it become? Shooting at 120 and playing at 24 stretches every second into five, which is exactly how slow motion is made. The chart shows the two rates side by side so you can see the gap grow with length.
Formula
frames = length × rate , length at the other rate = frames ÷ other rate
Variables
| Symbol | Meaning | Unit |
|---|---|---|
sec | How long the clip is | s |
fps | Frames per second | — |
fp2 | Frames per second you are converting to | — |
FR | Frames in total | — |
FD | How long one frame lasts | ms |
F2 | Frames at that other rate | — |
SL | If played back at the other rate, it lasts | s |
SF | How much faster or slower it plays | x |
Worked example
- How long the clip is10 s
- Frames per second24
- Frames per second you are converting to60
- Frames in total240
- How long one frame lasts41.667 ms
- Frames at that other rate600
- If played back at the other rate, it lasts4.000 s
- How much faster or slower it plays2.500 x
Limitations
- The calculation runs at full precision and only the display is rounded. If you copy an intermediate value and retype it, small differences can appear.