How many slides should a presentation have: guidelines for pitches, reports and talks

The short answer

One slide, one idea. Count the ideas your audience should walk away with, add a title slide and a closing slide — that's your slide count. Everything else is fine-tuning: how much time you have, whether the slides will be presented or read, and what's normal in your genre.

The numbers below are guidelines, not rules. They help you notice when a deck has clearly bloated, or when it's squeezed so tight that the slides feel crowded.

What the number depends on

Time

For a talk, start from your slot. Less of it goes to the actual talk than you think: late starts, the projector, questions. In his 10/20/30 rule Guy Kawasaki advises planning a pitch for twenty minutes even when the meeting is booked for an hour, with no more than ten slides.

The pace depends on what's on the slides. A slide with one image or one number moves quickly, and you may show several in a minute. A slide with a diagram or a table needs a couple of minutes. That's why there's no simple "one slide per minute" rule: estimate the pace for your material and check it in a run-through.

Presented or read

A deck that a speaker presents can use short slides: a statement, a number, a picture. A deck that's sent as a link or a file is read without you, and every slide has to explain itself. Nancy Duarte calls these slidedocs — visual documents that people read at their own pace. They usually have fewer slides and more text on each.

Where it's shown

In a hall a slide covers a whole wall; in an online meeting it's a window on a laptop screen next to everyone's faces, and links are often opened on a phone. The smaller the screen, the more large text and one idea per slide matter. If a slide can't be read on a small screen, split it in two rather than shrinking the font.

Genre and audience

Investors expect the familiar pitch structure, managers expect a short summary at the start of a report, students need repetition and questions. If your setting has a rule — a number of slides, a time limit or a fixed order — it beats any guideline.

How to count slides for your presentation

1. Write down the key ideas. One sentence each: "revenue grew thanks to new customers", "we need €300,000 for 18 months". Each sentence is a future slide.
2. Add the structural slides. A title and a closing slide with contacts or the next step. With more than eight slides, sections or an agenda help the audience see where they are.
3. Check against the clock. Estimate how many minutes each slide takes and add them up. If it doesn't fit, cut ideas, not font size.
4. Move the details out. Tables, methodology, backup numbers go into an appendix after the closing slide. Show them if someone asks.
5. Rehearse out loud. It's the only way to see where you click faster than you talk and where you linger too long.

Signs of too many or too few slides

Too many if two slides in a row say the same thing, if you skip slides saying "let's pass over this one", or if you run over time in rehearsal.

Too few if a slide carries three ideas, if you had to shrink the font to make everything fit, or if you read paragraphs off the slide. Then split the slide in two: two clear slides beat one crowded slide.

How to shorten a presentation

• Merge slides that make the same point — often the intro and the "about us".
• Replace a list with one number if that number says what matters.
• Move details into an appendix.
• Instead of a "Thank you for your attention" slide, show the next step and a contact — it keeps working after the talk.

How to do it in JamPres

The first step of a new presentation has “Length”: “Auto” or an exact number of slides, from 5 to 30. On “Auto” the number depends on how much text you give: a short topic description gives about 6–10 slides, a long text gives more. The purpose matters too: with “Pitch” the outline leans towards more slides with one idea each, with “Report” towards fewer, fuller slides.

You can always change the number in the outline — before building and for free: “Add slide”, “Delete slide”, drag slides into a new order. A long list from your text is split across neighbouring slides by the outline itself, and such a slide shows a note: “List from your text: N items, each one stays on the slide”.

In the editor the number of slides is unlimited. The template affects the count too: some fit more text on a slide than others. If text no longer fits after a template change, the slide is split in two, and the editor says so: “Added N slides: the text did not fit”. And if the new template has room, slides that were split are joined back.

To find out whether a deck is too long, use the analytics of the published page: “How far they get” shows which slide viewers reach and where people leave most often. That's from the Base plan; Free has the view counter. More in the help article on what analytics shows.