How Many Scenes per Minute in an Explainer Video? A Pacing Guide With the Math

How many scenes per minute should an explainer video have?

For a narrated stick-figure explainer, plan on about 12 scenes per minute, one every 5 seconds. That is the rhythm of the faceless history and science channels the format comes from: one calm voice, one new picture per sentence, slow camera motion in between.

Promotional animation runs faster. The studio Vidico says 16 to 18 illustrated scenes per 60 seconds worked best in its tests on Vimeo and paid YouTube ads, which is one scene every 3.3 to 3.75 seconds. Ads pack a short message into a short slot. An explainer has to land an idea the viewer didn't know, and that needs a little more time per picture.

Real numbers from a finished Short show the same rhythm. A 46-second StickTale Short on why Moroccans pour tea from high up has 8 scenes, which is 5.75 seconds per scene.

How many words per minute should narration be?

Scene count follows narration, so start with speaking rate. Baruch College's Tools for Clear Speech puts the average English speaker at about 150 words per minute, and suggests about 140 for speakers who need to be more intelligible. It also notes that presentations usually call for a slightly slower rate than conversation.

So 150 words a minute, or 2.5 words a second, is a safe planning number for a calm narrator. A gripping or funny read may run faster, and a documentary read slower. The point is not to hit 150 exactly, but to know your own number so the math below works for you.

1. Take any 100 words of your script.
2. Read them aloud at the pace you'll actually use, or play the voiceover, and time it.
3. Divide 100 by the seconds, then multiply by 60. 40 seconds means 150 words a minute; 45 seconds means about 133.
4. Divide that by 60 to get words per second, and use it in place of 2.5 everywhere below.

How many words should each scene have?

Multiply seconds per scene by words per second. At 5 seconds and 2.5 words a second, that is 12.5 words, so about 10 to 15 words per scene. In practice that is one sentence, which gives you the most useful rule in this guide: one sentence, one picture.

When a sentence runs past about 20 words, it needs two pictures or a cut. When two short sentences say one thing, they can share a picture. The test is whether the picture could change halfway through the sentence without confusing anyone. If yes, split it.

Pacing table: scenes and words from 45 seconds to 12 minutes

Here is the whole plan in one table. Words assume 150 words a minute minus pauses: about one 0.75-second beat every 30 seconds, which takes 2.5% off the time. Pictures assume one every 5 seconds for Shorts and 5 to 6 seconds for long-form, where you can afford more holds on maps and diagrams.

YouTube now classifies square and vertical videos up to three minutes as Shorts, so the Short rows stop at 3 minutes. For chapters, YouTube requires at least three timestamps, starting at 0:00, each at least 10 seconds long, so the chapter column starts at 5 minutes.

Worked example: a 44-second Short timed line by line

Here is a short explainer on why the ocean is salty, built from NOAA's explanation and the USGS answer. Each line is one picture. The first draft had lines 5 and 6 as one 25-word sentence, about 10 seconds on a single image, so it was split into a setup and a payoff.

The script is 105 words, which is 42 seconds at 2.5 words a second. Two pauses add about 1.7 seconds, for a total near 44 seconds and an average of 4.9 seconds per picture.

Where should you pause in an explainer?

Pauses are part of pacing, not gaps in it. Baruch's guide notes that short pauses between thoughts are normal in spoken American English, but too many make speech harder to follow. In an explainer, save them for the moments where the viewer needs a beat to think, or to want the answer.

A pause costs words. At 2.5 words a second, a 0.75-second beat is about two words, and a 1-second beat is two and a half. Four beats in a 45-second Short cost about 8 words, so cut them from setup lines, not from the reveal.

• Before a reveal: 0.5 to 1 second after the question, before the answer. The most valuable pause in the script.
• After a number: about half a second, so "3.5 percent" registers before the next sentence.
• Before the callback: about a second before the last line, so the ending feels like an ending.
• Not after every sentence: constant pauses read as slow narration, and viewers swipe.

When should scenes be shorter or longer?

Five seconds is an average, not a metronome. The scene length should follow what the picture asks of the viewer. A simple action reads in two seconds; a map with three labeled cities needs seven.

The four frames shown here, from a real Short on how ancient humans spent the night, show the kinds of pictures that need different times: a simple mood shot, a group scene, a picture with a number to read, and a busier panel with several sleeping figures to take in.

How do you pace a long-form explainer?

Long videos fail on pacing differently. A Short loses viewers in the first seconds; a 10-minute video loses them in the middle, when the topic stops changing. Use chapters of about two minutes, and give each one its own small hook and its own payoff, so the viewer gets a reward every two minutes, not only at the end.

Inside a chapter, use the same one-sentence-per-picture rhythm, but allow more holds for maps and timelines. If you script long-form videos, our guide to writing an explainer video script covers the chapter structure, and faceless YouTube channels often alternate long videos with Shorts cut from the same research.

1. Split the topic into chapters of 90 seconds to 2.5 minutes, each answering one sub-question.
2. Open each chapter with a one-line hook that raises its sub-question.
3. Count words per chapter: 2 minutes at 150 words a minute is about 290 words after pauses.
4. Plan one picture per sentence, and mark the holds for maps, numbers and diagrams.
5. End each chapter with a small payoff and a line that points to the next question.