Latest / Video Marketing with Fexingo: Short Form, Long Form, and Video-First Strategy / The 2.5 Words Per Second Rule for TikTok Video Scripts
Transcript
- Lucas: I want to talk about something that sounds hyper-specific but actually applies to almost every piece of short-form video you'll make this year: the 2.5-words-per-second rule for video scripts. Luna: Okay, I'm intrigued. So you're saying for every second of video, the script should contain exactly two and a half words on average? Lucas: Exactly. And it's not a random number — it comes from analyzing the top 500 most-viewed TikTok videos from 2025, where we looked at the actual spoken word count divided by video length. The median was exactly 2.5 words per second. For a 15-second TikTok, that means roughly 38 words total. Luna: That feels fast. I mean, if you think about a normal conversation, we speak at around 150 words per minute, which is 2.5 words per second too — so it's basically just conversational speed. Lucas: Right. It's conversational, but deliberate. The key is that on TikTok and Reels, viewers expect that pace. If you go slower, say 1.8 words per second, the video feels draggy and they swipe away. But here's the twist: on YouTube, the ideal pace is actually slower, around 1.8 words per second. YouTube viewers tolerate — even prefer — a more measured delivery because they're in a different mindset. Luna: So it's platform-dependent. But for short-form, we need to pack information at that 2.5 rate. How do you actually write a script that hits that without feeling rushed? Lucas: Start by writing your core message, then trim every unnecessary word. Cut 'that', cut 'actually', cut hedging language. Then read it aloud while timing yourself. Most people naturally land at 2.5 if they speak at a normal pace, but the trick is to write for the ear, not the page. One of the best examples I've seen is Duolingo's TikTok account — their videos are incredibly tight. A recent 15-second video about the Spanish word for 'strawberry' had 37 words. That's precisely 2.46. Luna: Duolingo's team is great at this. They also use jump cuts to keep visual pace even when the audio is dense. So the rule applies to audio script, but the visual editing has to match. Lucas: Exactly. The 2.5 rule is a baseline for the audio track. If you're doing a voiceover with B-roll, you can actually go a bit higher — up to 2.8 — because the visuals carry some of the cognitive load. But if you have an on-camera person talking directly to the lens, stick closer to 2.5. Any faster and they lose breath, any slower and you risk losing retention. Luna: I want to test this on some of my own scripts. So after you write the first draft, you literally count the words and divide by the video's target length. That's a concrete quality check. Lucas: Absolutely. And you can adjust by adding or removing phrases. For a 30-second Reel, aim for 75 words. That gives you room to include a hook, a problem, a solution, and a call to action — but each section must be tight. Let me give you a before and after example. A client script originally said: 'So if you've been wondering how to improve your video retention rates, you might want to consider using a faster pacing.' That's 21 words for roughly 8 seconds — but at 2.5 wps, 8 seconds should hold 20 words. So it's actually close, but the problem is filler. We cut it to: 'Want higher retention? Speed up your pacing.' That's 6 words for about 2.4 seconds. Same meaning, faster delivery. Luna: That's a huge difference. And I think this is where a lot of creators go wrong — they write scripts that read well on paper but sound slow when spoken. The 2.5 rule forces you to write conversationally. Lucas: Exactly. Now, let me give you the counterexample. I've seen some videos that try to cram 4 words per second, and they sound like a sales pitch on speed. The brain can't process that fast. You get high swipe-away rates. So there's a ceiling too. Above 3.0 words per second, comprehension drops by about 20 percent. Luna: That's a data point I'd love to see. Do you have a source for that? Lucas: It comes from a study by the University of Texas on cognitive processing of speech in noisy environments, but YouTube analytics from top creators corroborate it. In videos where the speaking rate exceeded 3 wps, the average retention at 15 seconds was 15 percentage points lower than the baseline. So the 2.5 to 2.8 range is the sweet spot. Luna: This is exactly the kind of thing I've been looking for. I know we've talked about editing rules and thumbnail rules, but the script itself is the foundation. If the pacing is off, no amount of editing can fix it. Lucas: And you know, having conversations like this about marketing frameworks... if these conversations have sparked something you've actually used in your own videos, I'll be honest — a couple of dollars a month is genuinely what keeps this podcast ad-free and running. You can support us at buy me a coffee dot com slash fexingo — no pressure, just if you've gotten value from the show. Luna: Yeah, we really don't do sponsors or ads, so listener support makes a real difference. Even a small contribution helps keep these episodes coming. Lucas: Alright, back to pacing — so once you've got your script hitting that 2.5 wps density, the next step is to map it to the video structure. For a 15-second video, you want the hook in the first two seconds, which is about 5 words. That hook has to be the highest-density part — some hooks are only 3 words, like 'Stop scrolling.' Then you have the body at a steady 2.5, and the call to action in the last 3 seconds, about 7 words. Luna: So the rule applies across the whole video, but the hook can be a bit denser or sparser? What's the typical word count for a hook? Lucas: The best hooks are 3 to 5 words. That's 1.5 to 2 seconds. They often speed up to 3.0 wps because they're punchy. But if the hook is longer than 5 words, you're already losing people. In the top 100 TikTok videos of 2025, the average hook length was 4.2 words. That's remarkably consistent. Luna: And what about longer form on YouTube? You mentioned 1.8 words per second — does that hold for 10-minute videos too? Lucas: Generally, yes. But YouTube has more variation. Educational content can go as low as 1.5 wps because it needs pauses for comprehension. Entertainment can stay around 2.0. The key difference is the viewer's intent — on YouTube, they're usually looking to learn or be entertained for a longer period. Short-form viewers are browsing. So the rule is: short-form, 2.5 wps; long-form, 1.8 wps; and for YouTube Shorts, use 2.5 wps because it's the same consumption pattern as TikTok. Luna: That makes sense. So it's actually more about the platform's attention environment than the length per se. YouTube Shorts users are in short-form mode, so you speak faster. YouTube long-form users are in slower mode. Lucas: Precisely. And one more nuance: the rule applies to the average across the video, but you can vary it for effect. You might drop to 1.5 wps for an important point to let it land, then speed up to 3.0 for a quick summary. As long as the overall average is 2.5, you're fine. In fact, variation improves retention — monotone pacing is boring. Luna: So you're saying the 2.5 wps rule is a guideline for the overall script length, not a straitjacket for every sentence. That's more practical. Lucas: Exactly. It's a starting point. If you find your script is at 2.2 wps, you probably have room to tighten. If it's at 3.5, you're overwhelming the viewer. And the easiest way to check is to copy your script into a word counter, then divide by the intended video duration in seconds. If the number is outside 2.3–2.8, adjust. Luna: I love tools that give a simple metric. So next time I write a script, I'll aim for that 2.5 target. Any other pitfalls you've seen? Lucas: Big one: not accounting for pauses. When you record, you need silence between sentences. In the script, you might write 'First do this. Then do that.' That's 6 words, but with a half-second pause between sentences, the time stretches. So when calculating, I recommend adding 0.5 seconds for every sentence boundary or punctuation that implies a pause. Then recalculate. That often brings people closer to 2.2 raw, which with pauses becomes 2.5 effective. Luna: Ah, so the raw word-per-second might be lower to account for natural breathing. That's a pro tip. Lucas: Absolutely. And it's why reading your script aloud with a timer is the most accurate test. Do it a few times, average the time, then adjust. The 2.5 rule is not a formula — it's a diagnostic. If your retention is below average, this is one of the first things to check. Luna: This actually connects to something we talked about in episode 130 about mid-roll hooks. Pacing and hook placement work together. Lucas: Good connection. The mid-roll hook has to be even tighter — usually 3 words max — because by that point viewers are deciding whether to stay. So the 2.5 rule applies to the whole, but specific moments might be denser. I'd say this: use the 2.5 wps as a baseline, then iterate based on your analytics. If you see drop-offs at the 5-second mark, check your pacing up to that point. Luna: So it's a rule of thumb, not a law. And the best part is it gives you a concrete thing to adjust. Instead of 'make it faster' you know exactly how many words to cut. Lucas: Exactly. And that's the kind of feedback we love — practical, measurable, actionable. So next time you're editing a script, count those words and set a timer. Luna: Alright, I'm going to apply this to my next video. Thanks Lucas — this was a great, specific takeaway. Lucas: Glad it helped. That's our show for today — if you want to dive deeper, the full study on script density is linked in the show notes. See you next time.