Free Words per Caption Calculator
Estimate a practical caption group size from speaking speed and target screen time, then see how quickly each one- to eight-word option would change.
3
words per caption
Then move boundaries to preserve natural phrases.
| words | estimated duration | caption changes per minute |
|---|---|---|
| 1 | 0.38 s | 160 |
| 2 | 0.75 s | 80 |
| 3 · estimate | 1.13 s | 53 |
| 4 | 1.50 s | 40 |
| 5 | 1.88 s | 32 |
| 6 | 2.25 s | 27 |
| 7 | 2.63 s | 23 |
| 8 | 3.00 s | 20 |
The calculation uses only the numeric settings in this browser. No transcript, audio, or video is required or transmitted.
What this tool handles
- Speech rate from 80 to 260 words per minute
- Target duration from 0.3 to 3 seconds
- One to eight words per caption
- Estimated changes per minute
Four checks from input to export
- 1Enter or estimate the speaker's words per minute.
- 2Choose a target time each caption should remain on screen.
- 3Compare the calculated group size with the one-to-eight-word table.
- 4Test the recommendation on real speech and revise for phrase boundaries.
What the browser changes
The baseline is speech words per second multiplied by target display seconds, rounded to a bounded whole-word group. It is a pacing estimate, not semantic segmentation.
- Choose a default for a talking-head preset.
- Compare fast podcast speech with a slower tutorial.
- Estimate how visually busy one-word captions will feel.
- Natural phrase boundaries matter more than a fixed number.
- Language, word length, font width, and frame size change readability.
- Fast cuts and active-word highlights can tolerate different group sizes.
Quick answers
Is three words always best?
No. Three is a common starting point, but the speaker, language, font, and phrase structure should decide.
What if the speaker changes pace?
Use the faster section as a stress test or vary grouping after transcript review.
Does this measure reading accessibility?
No. Use the reading-speed checker and real audience testing as separate checks.
Need automatic transcription and animated output too? Caption Plug works in a browser or directly inside Premiere Pro.