Can You Read as Fast as People Talk?We subtitled 10,165 English videos word for word and measured how fast every subtitle would have to be read.
Netflix lets English subtitles run at up to 20 characters per second for adult shows, and 17 for children's shows. Real speech doesn't always fit. When we turned 256 hours of speech into subtitles under Netflix's own rules, keeping every word, 18% of the subtitles came out faster than the adult limit.
Key Findings
- 18% of subtitles would be faster than Netflix's limit of 20 characters per second for adult shows, and 37% faster than its limit of 17 for children's shows.
- The median subtitle needs about 15 characters per second, so most speech fits. The trouble is the fast stretches.
- In 1 in 8 videos, the whole video averages over 20. Retiming alone can't fix those. Words have to be cut.
- The median speaker said 165 words per minute counting pauses, and 194 while actually talking.
Chart data as a table
| Characters per second | Share of subtitles |
|---|---|
| 0-1 | 0.40% |
| 1-2 | 0.20% |
| 2-3 | 0.52% |
| 3-4 | 1.44% |
| 4-5 | 1.32% |
| 5-6 | 1.57% |
| 6-7 | 1.91% |
| 7-8 | 2.25% |
| 8-9 | 2.70% |
| 9-10 | 3.28% |
| 10-11 | 4.19% |
| 11-12 | 5.00% |
| 12-13 | 6.10% |
| 13-14 | 7.25% |
| 14-15 | 7.98% |
| 15-16 | 8.43% |
| 16-17 | 8.29% |
| 17-18 | 7.57% |
| 18-19 | 6.49% |
| 19-20 | 5.26% |
| 20-21 | 4.28% |
| 21-22 | 3.32% |
| 22-23 | 2.49% |
| 23-24 | 1.91% |
| 24-25 | 1.34% |
| 25-26 | 1.07% |
| 26-27 | 0.74% |
| 27-28 | 0.61% |
| 28-29 | 0.43% |
| 29-30 | 0.34% |
| 30+ | 1.33% |
How We Measured It
We took every English video captioned with CaptionX between May 21 and November 2, 2026, and turned its transcript back into subtitles using Netflix's published rules for English. Then we measured each subtitle's reading speed: its characters divided by its time on screen.
These are the Netflix rules we used, each from Netflix's own partner guidelines:
| Rule | Netflix (English, USA) | Source |
|---|---|---|
| Characters per line | 42, up to 2 lines | English (USA) Timed Text Style Guide |
| Reading speed | Up to 20 characters per second for adult shows, 17 for children's shows | English (USA) Timed Text Style Guide |
| What counts as a character | Letters, spaces and punctuation | Netflix FAQ on reading speed |
| Time on screen | At least 5/6 of a second (20 frames), at most 7 seconds | General Requirements |
| After the words end | Stay up about half a second; close gaps shorter than half a second to 2 frames | Subtitle Timing Guidelines |
Our own choices: a new subtitle starts at any pause of half a second or more, or when the next word would break the 84-character or 7-second limit. We left out videos with fewer than 50 words, videos whose language wasn't clearly English, our own test accounts, repeat runs of the same file, and 139 very long videos we had no word timings for. That left 10,165 videos, 256 hours of speech and 306,517 subtitles.
Most of these videos are short. The median one has about 50 seconds of talking, so they're closer to social clips than TV shows or films. Nobody read the transcripts: the analysis only used character counts and word timings, and only totals are published here.
How Much Does the 18% Depend on Our Choices?
Not much, and the main result is close to the low end. Changing how the subtitles are cut and timed mostly pushes the share up:
| Assumption | Videos | Over 20 CPS | Over 17 CPS |
|---|---|---|---|
| Netflix timing (the main result) | 10,165 | 17.8% | 37.2% |
| Each subtitle disappears as soon as the words end | 10,165 | 30.4% | 54.6% |
| New subtitle only at pauses of 1 second or more | 10,165 | 19.5% | 40.9% |
| One line of 42 characters at most | 10,165 | 25.2% | 43.6% |
| Only videos with 2+ minutes of talking | 1,794 | 17.0% | 35.2% |
How Fast Do People Talk in Real Videos?
The same transcripts also give each speaker's pace. Counting every pause, the median video ran at 165 words per minute, and half of all videos fell between 135 and 195. Taking out pauses of half a second or more, the median was 194 words per minute (170 to 223 for the middle half).
Words per minute, counting pauses
165
median video
Words per minute while talking
194
median video
Why Subtitles Don't Match What People Say
If 18% of word-for-word subtitles are faster than the limit, something has to give. Netflix's guidelines say what: cut the text, not the viewer's reading time.
“When editing for reading speed, favor text reduction, deletion and condensing.”
That's why streaming subtitles often drop filler words and shorten sentences. Our numbers show how often it's needed when nothing is cut: about 18% of subtitles in typical videos, and far more in fast-talking ones.
Check Your Own Subtitles
Open an SRT or VTT file in the free CaptionX SRT editor. It flags every subtitle faster than 20 characters per second, counting spaces and punctuation the same way Netflix does, and can stretch a subtitle's timing for you.
Open the SRT editorUsing This Data
You're welcome to use the chart and the numbers under the Creative Commons Attribution 4.0 license (CC BY 4.0). Please link to this page as the source.
Questions about the method: support@caption-x.com
Frequently Asked Questions
What is a good reading speed for subtitles?
Netflix's English guidelines allow up to 20 characters per second for adult shows and up to 17 for children's shows. Spaces and punctuation count as characters.
How fast do people talk?
In the English videos we measured, the median speaker said 165 words per minute counting pauses, and 194 words per minute while actually talking (pauses of half a second or more taken out).
How many characters per line can a subtitle have?
Netflix's English guidelines allow 42 characters per line and a maximum of two lines, so up to 84 characters on screen at once.
Why don't subtitles match what people say?
Because speech is often faster than people can read. In our data 18% of subtitles would break Netflix's 20 characters-per-second limit if every word were kept, so subtitlers shorten them. Netflix tells them to favor text reduction, deletion and condensing when editing for reading speed.