How long is a 1,500-word script on screen? How many words fill a 10-minute video? Convert both directions, with pace presets tuned for AI voices and YouTube narration.
| Format | Typical length | Words needed |
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Add ~10–15% to the duration for pauses, b-roll beats and breathing room — tight scripts read faster on paper than they play on screen.
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At natural narration pace (150 wpm): a 20-second Short is ~50 words, a 60-second Short ~150 words, a 5-minute video ~750 words, a 10-minute video ~1,500 words. Writing for a 10-minute tech or finance video? That length also happens to be the sweet spot for RPM — see why in the RPM calculator.
The 150 words-per-minute default is a good average, but almost nobody narrates at exactly 150. Where you land depends on the format, the voice, and how much silence you leave between ideas — and a 20% pace difference on a 10-minute script is two full minutes of runtime.
The most common scripting mistake is drafting a page of text and then discovering it runs eleven minutes when the video needed eight. Working backwards from time fixes this. Decide the runtime first, convert it to a word budget at your real pace, then split that budget across the sections of the video before writing a single sentence.
A 60-second Short at 175 wpm gives you about 175 words. A structure that consistently holds attention spends them roughly like this: the first 2 seconds (six words) on a concrete hook, the next 40 seconds (about 115 words) delivering the promised information in two or three beats, and the final 15 seconds (around 45 words) on the payoff and a single call to action. Front-loading the payoff matters more than polish — in our own channel data, videos that delayed the answer past the ten-second mark lost most viewers before it arrived.
For long-form, budget by chapter. A 10-minute video at 150 wpm is 1,500 words; splitting it into six chapters of about 250 words each gives every section a natural 90-second rhythm and makes YouTube's chapter markers line up with your script. The 8-minute mark is also where mid-roll ads unlock, so scripts that land between 8 and 12 minutes tend to earn more per view than either shorter or much longer ones.
Synthetic voices are consistent, which is both the advantage and the trap. They never rush or stumble, so the calculator's estimate will be very close to the real render — but they also never pause for emphasis unless the text tells them to. Three habits close the gap: write shorter sentences than you would speak aloud (TTS handles 12–18 words per sentence far better than 30), put important numbers at the start of a sentence where they get natural emphasis, and read the generated audio back at 1.25× speed once. If it still sounds slow, the script is padded; if it sounds frantic, you have too few sentence breaks.
Once the timing works, the remaining variable is the voice itself. Free options such as edge-tts are perfectly usable for drafts and many published videos; the audible step up to a premium voice is mostly in pacing naturalness and emotional range, which matters more for story content than for tutorials.
About 1,300–1,600 words at natural narration pace (150 wpm), or up to 1,850 at fast YouTube pacing. Leave 10–15% headroom for pauses and visual beats.
Most TTS voices (edge-tts, ElevenLabs defaults) land around 160–170 wpm — slightly faster than natural human narration. If your video feels rushed, either slow the voice rate or write ~10% fewer words.
Around 150 words at narration pace, or up to 210 at hyper-cut pacing. For Shorts, less is usually more — a tight 100-word script with visual breathing room outperforms wall-to-wall talking.