How many slides for a 10-minute presentation (and for 5, 15, 20 and 30 minutes)

The short answer

Most advice converges on about one slide per minute of speaking for a typical business or class presentation. That pace gives each slide enough time to be read and explained without leaving the audience staring at a static screen. Two adjustments matter more than the headline figure.

• Dense slides take longer. A chart, a table or a process diagram often needs one and a half to three minutes, so data-heavy talks run closer to one slide every two minutes.
• Light slides go faster. A slide with a single image, quotation or number can last 20 to 30 seconds, so visual talks can use more slides than minutes.

A rule of thumb, not a standard: about one slide a minute, fewer when slides carry charts, and the time for questions kept out of the count.

Rules of thumb by length

The ranges below count main slides, including the title slide but not backup or appendix slides. They assume a mix of text and charts at a normal speaking pace. Treat them as starting points to adjust, not targets to hit.

• 5 minutes: 3 to 6 slides. One message, one or two pieces of evidence and a close.
• 10 minutes: 7 to 10 slides. Three main points, each with a slide or two.
• 15 minutes: 10 to 14 slides.
• 20 minutes: 12 to 18 slides, or 10 to 14 if most slides carry charts or tables.
• 30 minutes: 18 to 25 slides.
• 45 minutes: 25 to 35 slides.
• 60 minutes: 30 to 45 slides, with 10 to 15 minutes kept for questions.

Adjust for the type of talk

The setting changes the count as much as the clock does. These adjustments are also rules of thumb; a brief, an organizer or a committee's rules always come first.

• Investor pitch: 10 to 15 slides whatever the slot, because the deck is often read before or after the meeting. Guy Kawasaki's 10/20/30 rule (10 slides, 20 minutes, no font smaller than 30 points) is a well-known version.
• Class presentation: follow the assignment first. Without one, about one slide a minute works, with a title, an outline for anything over ten minutes and a closing summary.
• Interview presentation: often 5 to 8 slides for 10 minutes, because the panel wants time to question you. Ask how long they want you to speak and whether that includes questions.
• Conference talk: slots are short and strictly timed. For a 15-minute slot that includes 3 to 5 minutes of questions, plan on 10 to 12 slides.
• Board update: fewer slides than minutes. Boards often read the pack in advance, so 5 to 10 main slides for a 20 or 30-minute item, with detail in the appendix, leaves room for discussion.
• Thesis defense: about one slide every one to one and a half minutes, so roughly 12 to 15 for a 20-minute master's defense, plus backup slides. Programs vary, so check yours.

One idea per slide matters more than the count

Slide count is a proxy. What actually limits a presentation is the number of ideas an audience can follow in the time. A 10-minute talk can usually carry three main points; a 30-minute talk, perhaps five. If each slide makes exactly one point, stated in its title, the count follows from the content and the timing mostly looks after itself.

Trouble starts when the number is fixed first. A speaker told “no more than 10 slides” crams three ideas onto each one; a speaker who thinks more slides look thorough splits one idea across four. Both lose the audience. Write each slide's point as a full-sentence title first (see our guide to action titles), then count.

What counts toward the total

• The title slide counts as a slide but takes only seconds. The ranges above include it.
• An agenda slide is worth having for talks of 15 minutes or more, and usually not for shorter ones.
• Section dividers take seconds. Count them, but do not budget a minute each.
• A closing slide with the ask or the summary counts, and deserves real time.
• Backup and appendix slides do not count toward the time. Keep them after the closing slide, ready for questions.
• Questions are not slide time. If the slot is 10 minutes including questions, build for 7 or 8 minutes of speaking.

A sample 10-minute, 8-slide storyline

A support team leader has 10 minutes at a monthly operations meeting to ask for a change to the overnight rota. Each title below states the slide's point, and the timings add up to about nine minutes, leaving one minute of slack. The numbers are illustrative.

1. Moving overnight support to a follow-the-sun rota (15 seconds)
2. Overnight tickets have tripled in a year and now make up 30% of volume (1 minute)
3. Customers wait four hours on average for an overnight reply, against 20 minutes in the day (1 minute 30)
4. The on-call rota is not sustainable: three of eight engineers have asked to leave it (1 minute 15)
5. A follow-the-sun rota with the Manila team covers nights without anyone on call (1 minute 30)
6. It costs $90K a year, less than the overtime we pay today (1 minute 30)
7. The main risk is the handover between teams, which a shared ticket checklist addresses (1 minute)
8. Decision needed: approve a three-month trial starting in May (1 minute)

Read the titles alone and the argument holds. That is a better check than the count: if the storyline makes sense in eight titles, eight slides is the right number.

Fitting a talk to its slot

1. Draft the titles first and estimate a time for each, using the ranges above.
2. Rehearse aloud with a timer. Most people speak faster in their heads than out loud, and slower again in front of a room.
3. If you are over, cut whole slides, starting with those whose point the audience already accepts. Talking faster does not work.
4. Move cut slides to the appendix rather than deleting them, so they are there if a question needs them.
5. Leave a minute or two of slack in any slot under 20 minutes, and more in longer ones.