Free tool · Planning
Slide count calculator: how many slides for your talk
Enter your time slot and the minutes you keep for questions. You get the number of slides, a range and a minute plan for every slide.
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How to use the slide count calculator
Set the slot and the questions
Drag the slider to the length of your time slot, questions included. The calculator suggests how many minutes to keep for questions; change the number if your audience asks more or less.
Pick the format
Choose business update, pitch, board meeting, keynote, training or workshop. Each has its own minutes per slide, because a keynote slide carries one image and a board slide carries a chart.
Set your pace
Relaxed, steady or brisk moves the marker inside the range. Choose the pace from your last rehearsal, not from how fast you would like to talk.
Read the plan
The result shows the slide count, the range and a time bar that splits the talk into title, summary, messages, risks and decision. Use the slide list as the first running order of your outline.
Rehearse once
Run the talk once with a timer and correct the count. Then keep the brief on this page as the start of your deck, or build the slides yourself.
Sources
How it works and what it rests on
Where a number is our own rule of thumb, we say so.
The calculator counts minutes first and slides second. It subtracts the minutes for questions from your slot, reserves half a minute for the opening slide and divides the rest by the minutes one slide takes in your format: 1.6 for a business update, 1.8 for a pitch, 2.2 for a board meeting, 0.8 for a keynote, 2.5 for training and 4 for a workshop. For a 20-minute slot with 5 minutes for questions that is 1 + 14.5 / 1.6, which rounds to 10 slides. These minutes per slide are our own planning allowances, not measurements.
The published rules disagree because they describe different talks. Guy Kawasaki's 10-20-30 rule allows ten slides in at most 20 minutes, which is two minutes per slide. A common rule of thumb says one slide per minute. PechaKucha shows 20 slides for 20 seconds each, as of October 2026. The formats in the calculator sit between them, and the guide to the number of slides compares the three.
The range comes from the pace. A relaxed speaker spends 30 percent more time on each slide and a brisk one 20 percent less, so the same slot holds fewer or more slides. The minutes suggested for questions follow a table of our own: none for 5 minutes, then 2, 3, 5, 10, 15 and 20 minutes for slots of 10, 15, 20, 30, 45 and 60 minutes, and about a third of the slot beyond that. The ranges are computed from these rules, and the table for the usual slots from 5 to 60 minutes uses the same figures.
The plan splits your talking time by the role of each slide. The title gets the least, the summary and the decision the most, and the slides that carry your messages share the rest, in half-minute steps that add up to your talking time. Appendix and backup slides are not counted, because you show them only when someone asks. Treat the plan as a first draft of your running order and replace it with your own timings after one rehearsal.
Slides, words and minutes per slide by slot
| Slot | Time to talk | Slides (range) | Words | Per slide |
|---|---|---|---|---|
| 5 minutes | 5 min | 4 (3 to 5) | 650 | 1.3 min |
| 10 minutes | 8 min | 6 (5 to 7) | 1,040 | 1.3 min |
| 15 minutes | 12 min | 8 (7 to 10) | 1,560 | 1.5 min |
| 20 minutes | 15 min | 10 (8 to 12) | 1,950 | 1.5 min |
| 30 minutes | 20 min | 13 (10 to 16) | 2,600 | 1.5 min |
| 45 minutes | 30 min | 19 (15 to 24) | 3,900 | 1.6 min |
| 60 minutes | 40 min | 26 (20 to 32) | 5,200 | 1.5 min |
Business update at a steady pace, with the suggested minutes for questions. Words at 130 a minute, the normal pace of the speaking time calculator, without pauses.
FAQ
Frequently asked questions
How many slides for a 10-minute presentation?
About six. Keep two minutes for questions and talk for eight, and a business update at a steady pace needs six slides: a title, a summary with the answer, three messages and the ask. A relaxed pace gives five, a brisk one seven. Go up to eight only if each slide carries a single number or image.
How many slides for a 20-minute presentation?
Ten, with a range of 8 to 12. With five minutes kept for questions you talk for fifteen minutes, which is about 1.5 minutes per slide on average. Use the low end for dense slides with charts and the high end for light ones.
How many slides for a 5-minute presentation?
Three to five, with four as a default. A five-minute slot usually has no separate time for questions, so plan a title, the answer, one message with its proof and the ask. Anything beyond five slides forces you to rush.
How many minutes should each slide take?
One to two minutes for a slide with one message and one chart. A title takes seconds, a keynote slide with one image under a minute, a dense analysis slide two to three minutes and the decision slide two to five. These are planning figures, so time one rehearsal and adjust.
How many slides is too many?
In a business talk, more slides than minutes of talking. Past that point you rush, read aloud or skip slides. Only light slides with one image or number can go faster, as in a keynote or PechaKucha. If you have too many, merge slides that make the same point and move detail to the appendix.
Do the title, thank-you and appendix slides count?
The title counts but takes seconds, and the calculator reserves half a minute for it. Skip the thank-you slide, because the last slide you show should hold the ask. Appendix and backup slides do not count toward your time, since you show them only when someone asks.
Keep reading
Delivering the talk
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- Free toolSpeaking time calculator
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- GlossaryHandout
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- Free toolFont size calculator
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- GlossaryAppendix
The appendix is the backup section after the closing slide: data, methods and details you show only if someone asks. See what belongs in it and what does not.
- GlossarySpeaker notes
Speaker notes are the text under a slide that only the presenter sees: what to say, the key numbers and the transition. Learn how to write and use them well.
Put it into a finished deck
Describe your talk in a sentence, add your files and get an editable PowerPoint deck. The brief from this page is filled in for you.
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