How Many Slides Should a Presentation Have?

There is no single right number. It depends on how long you have and whether you will present the deck or send it. As a rule of thumb, plan roughly one slide for every one to two minutes of a spoken talk, so 10 to 20 slides for a 20-minute slot. Pitch decks usually land around 10 to 15 slides. Decks sent to be read on their own need fewer slides with more on each, or more slides if the subject demands it.

Slide count is a symptom, not a goal. A deck runs too long because it is trying to make too many points, not because it has too many slides. Start from your time, your format and the decision you need, and the number follows.

Start From the Time You Have

For a presented talk, time is the hard limit. A useful starting point is one to two minutes per slide. Some slides take five seconds, such as a section break or a single striking image. Others, like a detailed chart, can take three or four minutes. Averaged out, most presenters settle around that range.

Notice that the talking time is always shorter than the slot. Meetings start late, the screen share fails and people want to ask questions. Plan to finish early. Nobody has ever complained that a presentation ended five minutes ahead of time.

The 10/20/30 Rule

The best-known rule of thumb comes from Guy Kawasaki, who set it out in an Entrepreneur article: 10 slides, no more than 20 minutes, and no text smaller than 30 points. His reasoning was that people struggle to take in more than about ten ideas in a meeting, and that a 20-minute pitch leaves most of an hour-long meeting free for discussion, after time lost to setup, late arrivals and early departures.

He wrote it for pitches to venture capitalists, though he said it applies to any presentation meant to reach an agreement, such as a sale or a partnership. It is a useful discipline rather than a law. The 30-point font guideline is the most useful part for most business decks, because it physically stops you putting a paragraph on a slide.

Typical Slide Counts by Presentation Type

These ranges are a starting point, based on what the format usually has to cover. Adjust them for your time slot and audience.

• Investor pitch deck: about 10 to 15 slides. Problem, solution, market, product, business model, traction, competition, team, financials and the ask, with a few extra slides where your story needs them. Keep detailed financials and technical depth in an appendix you can open if asked.
• Sales presentation: about 8 to 15 slides. The buyer's situation and problem, what changes with your product, proof, pricing or options, and next steps. Sales calls are conversations, so a shorter core deck with backup slides works better than a long one you have to rush.
• Board or investor update: about 10 to 20 slides. Headline results, key metrics against plan, what went well, what did not, decisions needed and the outlook. These are often sent ahead and read, so each slide may carry more detail than a spoken talk.
• Webinar: often 20 to 40 slides for 45 to 60 minutes. Online audiences look at the screen the whole time and lose attention when it stays still, so webinars often use more slides with less on each. Build in time for questions and any demo.
• Internal update or team meeting: as few as possible. Often three to six slides are enough. If it could be an email, consider sending the email.
• Training session: depends on activities. Slides support the exercises, not the other way around. Count the slides for the teaching segments only.

Presented Decks vs Read Decks

A deck you present and a deck you send are two different documents, even if they share a template. This is where most slide-count advice goes wrong.

In a presented deck, you are the explanation. Slides carry a headline and one visual or a few numbers, and the detail lives in your speaker notes, which Microsoft describes as visible on your monitor but not to the audience. More, simpler slides work well because you control the pace.

A read deck, sometimes called a leave-behind or read-ahead, has to work with nobody in the room. Each slide needs complete sentences, labeled charts with the takeaway written out, and enough context to stand alone. That usually means fewer slides with more on each, closer to a short report in landscape format.

How to Cut a Deck That Is Too Long

If your draft runs long, cut messages, not slides. Removing slides while keeping every point just crowds the ones that are left.

1. Write each slide's headline as a full sentence. Then read only the headlines in order. Any slide whose headline does not move the argument forward can go.
2. Merge slides that make the same point. Three slides of supporting evidence can often become one slide with the strongest example.
3. Move detail to an appendix. Methodology, full data tables and edge cases go after the closing slide, ready if someone asks.
4. Move explanation to speaker notes. If text on a slide is there to remind you what to say, it belongs in the notes.
5. Rehearse with a timer. The clock is the final judge. If you run over, cut again.

Our guide on how to write a business presentation covers the step before this one: building the argument from the decision you need, so the slides you keep each make one clear point.

When More Slides Is Fine

Slide count is not the same as length. Twenty slides that each show one image and one sentence can take less time than eight slides crammed with bullet points. Fast, visual decks with many slides can work well in keynotes and webinars, as long as each slide earns its moment and you keep to time.

The test is not how many slides you have. It is whether the audience can tell you, afterwards, what you asked them to do.

If you want help getting a deck to the right length, our presentation writing service writes slide headlines, slide text and speaker notes from your brief, priced by deck size: $75 for 10 slides, $150 for 20 and $225 for 30. We can also rewrite and redesign an existing deck. Everything is written by our in-house team, with revisions until the brief is met.