Aidar Akmaev
Quick answer: plan about one slide per minute of speaking time, or slightly fewer: 6–10 slides for a 10-minute talk, 12–20 for 20 minutes and 18–30 for 30 minutes. Data-heavy meetings need fewer slides (one every 2–3 minutes); image-led talks need more (2–3 a minute). Subtract Q&A first. Title, closing and backup slides don't count.
How many slides for a 5, 10, 15, 20, 30, 45 or 60-minute presentation?
Multiply the minutes you will actually speak by the pace that fits your talk. The table does the arithmetic; the standard column fits most class, team and conference presentations.
| Speaking time | Data-heavy (2–3 min a slide) | Standard (0.6–1 a min) | Image-led (2–3 a min) | Script (120–150 words a min) |
|---|---|---|---|---|
| 5 minutes | 2 | 3–5 | 10–15 | 600–750 words |
| 10 minutes | 3–5 | 6–10 | 20–30 | 1,200–1,500 words |
| 15 minutes | 5–7 | 9–15 | 30–45 | 1,800–2,250 words |
| 20 minutes | 7–10 | 12–20 | 40–60 | 2,400–3,000 words |
| 30 minutes | 10–15 | 18–30 | 60–90 | 3,600–4,500 words |
| 45 minutes | 15–22 | 27–45 | 90–135 | 5,400–6,750 words |
| 60 minutes | 20–30 | 36–60 | 120–180 | 7,200–9,000 words |
How to read it. Counts are content slides for the time you speak. Add a title and a closing slide on top. If questions share the slot, use the speaking time: a 15-minute slot with 3 minutes of questions is a 12-minute talk, so 7–12 slides. The three paces are our rules of thumb; the standard pace tops out at the one-slide-a-minute ceiling that conference organisers set [7][8].
Long talks mix paces. Plan an hour by section: data at 2–3 minutes a slide, story at about a minute, photos at 20–30 seconds each. Then add the sections up.
How many slides by type of presentation
The kind of talk changes the pace more than its length does. Pitches and board meetings save most of the slot for discussion, technical talks need time on each slide, and PechaKucha and Ignite fix the count for you.
| Talk type | Usual length | Slides | Pace | Basis |
|---|---|---|---|---|
| Pitch or sales meeting | 20 min presented, rest discussion | 10 | 0.5 a min | 10/20/30 rule [1] |
| Job interview presentation | 5–15 min, then questions [11] | 3–4 for 5 min; 6–7 for 10 min, in total | 0.6–0.8 a min | jobs.ac.uk [10] |
| Conference talk | 12–15 min of talk | 8–12 | 0.5–1 a min | IPDPS 2026: 8–10, max 12 for 15 min [6]; IASLT 2026: 10–15 for 12 min [7] |
| Board meeting, QBR or data review | 20–30 min presented, then discussion | 8–12, plus appendix | 0.3–0.5 a min | Rule of thumb |
| Lecture or class | 50–60 min slot, minus activities | 20–32 for 40 min of talk | 0.5–0.8 a min | Rule of thumb |
| Webinar | 30–60 min, minus Q&A and polls | About 1 per minute of talk | About 1 a min | Rule of thumb |
| TED or TEDx-style talk | Under 18 min; 3–9 ideal [4] | Few, or image-led | Up to 2–3 a min | No official slide rule |
| Three Minute Thesis (3MT) | 3 min maximum | 1 static slide | — | Official rules [5] |
| PechaKucha 20×20 | 6 min 40 s | 20 | 3 a min | Official format [2] |
| Ignite | 5 min | 20 | 4 a min | Official format [3] |
Why published answers disagree. For a 10-minute talk, popular guides say anything from about 5 slides (Plus AI, two minutes a slide, May 2024 [14]) to 8–12 (Adobe Express, one minute a slide, May 2025 [15]). Both fit some talk: two minutes a slide suits a discussion or data review, one minute a standard talk. Pick the pace by talk type first. For what goes on the ten pitch slides, see our pitch deck guide.
The named rules, checked at the source
Five named rules come up whenever this question is asked. Here is what each original says, checked on 2 October 2026.
- 10/20/30 rule (Guy Kawasaki, 30 December 2005): ten slides, no more than twenty minutes, no font smaller than thirty points. Kawasaki wrote it as a venture capitalist and applies it to any presentation meant to reach agreement, such as raising money or making a sale. The twenty minutes is the presented part of a one-hour meeting, leaving about forty for discussion. His alternative to thirty points: the age of the oldest person in the room, divided by two [1].
- PechaKucha 20×20 (Astrid Klein and Mark Dytham, Japan, 2003): 20 images, each advancing automatically after 20 seconds: 400 seconds, or 6 minutes 40 seconds [2].
- Ignite (Brady Forrest and Bre Pettis, Seattle, 2006): 20 slides that advance automatically every 15 seconds, so every talk lasts exactly 5 minutes [3].
- TEDx talk length: TED's rules say talks are typically under 18 minutes, 3–9 minutes is ideal for a focused idea, and interviews or dialogues can run to 30 [4]. TED sets no slide count.
- Three Minute Thesis (University of Queensland, first held 2008): three minutes maximum and a single static slide, with no transitions or animation [5].
In the two auto-advancing formats you write to the clock: at 130–150 words a minute, a 20-second PechaKucha slide holds about 45 spoken words and a 15-second Ignite slide about 35.
How to calculate your slide count
Content slides = speaking minutes × slides per minute. Five steps take you from the time slot to a plan you can rehearse.
Step 1 — Find your speaking time
Subtract questions, introductions and handover from the slot. NCER 2026 gives each speaker 15 minutes, 12 to talk and 3 for questions [9]; IPDPS 2026 gives 15 minutes plus 5 for questions and set-up [6].
Step 2 — Choose a pace
Data or discussion: one slide every 2–3 minutes. Standard talk: 0.6–1 a minute, at the low end for technical content. Image-led: 2–3 a minute.
Step 3 — Multiply and round down
12 minutes at a standard pace: 12 × 0.6–1 = 7–12 content slides. Rounding down leaves slack for a late start or a question mid-talk.
Step 4 — Add the frame and the backups
Add a title and a closing slide. Put backup slides (detailed data, method, extra examples) after the closing slide, numbered A1, A2 and so on, so they never count against your time.
Step 5 — Rehearse with a timer and cut slides, not pace
Run the talk aloud once. If you are two minutes over, cut two minutes of content instead of speaking faster.
How many words per minute, and per slide?
English speakers in the US average about 150 words a minute, so plan a script at 120–150 words for each minute you talk: 1,200–1,500 words for a 10-minute presentation.
The figure of about 150 words per minute comes from the National Center for Voice and Speech [12]. VirtualSpeech suggests 100–150 as a comfortable presentation pace; in its analysis of five popular TED talks, speakers averaged 173 words a minute, ranging from 154 to 201 [13]. Five talks is a small sample, but it shows that rehearsed talks can run well above 150.
- Spoken words per slide = words per minute × minutes on the slide: about 120–150 for a one-minute slide.
- Words on the slide should be far fewer. Kawasaki's case for a 30-point floor: once the audience sees you reading the slide, it reads ahead, because it reads faster than you speak [1]. As a rule of thumb, give a presented slide a headline that states the point and no more than about 30 words of body text. Layout and font sizes are in our guide to professional presentation design.
- Presenting in a second language? Plan at about 120 words a minute and time a full read-through.
What changes the number of slides
Six things move the count more than the length of the talk does.
- Questions inside the slot. Subtract them first. Kawasaki keeps forty of sixty minutes for discussion [1]; the conferences cited here keep 3–5 minutes of a 15–20-minute slot for questions [6][9].
- Data density. A chart the audience has to read takes 2–3 minutes; a photo can carry 20 seconds.
- Builds and animation. Count ideas, not clicks. A slide that reveals four points in four clicks is one idea.
- Language and interpretation. In a second language or through an interpreter, plan at the low end of each range.
- Online delivery. On a webinar the slide fills the viewer's screen. As a rule of thumb, change the visual about once a minute.
- Read, not presented. A deck sent as a pre-read, such as a board pack, is sized by content, not minutes; the presented version is shorter. Our board meeting presentation guide covers both.
Worked examples: interview, conference and board meeting
Three illustrative plans show the formula at work. The talks are fictional; the sources behind each pace are cited.
1. A 10-minute job interview presentation
You speak for 10 minutes, then the panel asks questions. A standard pace would give 6–10 content slides, but jobs.ac.uk advises 6 or 7 slides in all [10], which leaves room to explain each point. This plan uses seven, the task-presentation structure from our job interview presentation guide, timed to 9:00 so a slow start or an early question doesn't push you over.
| Slide | What goes on it | Time |
|---|---|---|
| 1 | Title: the brief as your theme, name, role | 0:20 |
| 2 | Your recommendation in one line, three reasons | 1:00 |
| 3 | The situation: two or three sourced facts | 1:30 |
| 4 | The options you weighed, and why yours wins | 2:00 |
| 5 | The plan: steps, owners, dates | 2:00 |
| 6 | Results to track and the top two risks | 1:30 |
| 7 | Close: the answer again, what you'd need | 0:40 |
| Total | 5 content slides plus title and close | 9:00 |
The same guide has slide-by-slide plans for the "present yourself" talk and the 30-60-90 day plan.
2. A 15-minute conference slot
The slot is 15 minutes with 3 for questions, as at NCER 2026 [9], so you speak for 12. Technical content sits at the low end of the standard pace: IPDPS 2026 calls 12 technical slides the practical maximum for a 15-minute talk and 8–10 more realistic [6]. Plan eight content slides: motivation, research question, two on method, three on results and the takeaway. Add a title, a closing slide with your contact details and three backup slides after it.
3. A board update in a one-hour agenda slot
Borrow Kawasaki's split: present for 20 minutes, discuss for 40 [1]. Board slides are dense, so use the data-heavy pace: 7–10 slides. A workable eight: executive summary with the asks, KPI scorecard, variance explained, two deep dives, the plan, risks and decisions needed. Everything else goes in a numbered appendix. Our QBR presentation guide details the scorecard and variance slides.
Build a deck with the right number of slides in NOXI
Tell NOXI the time slot and how many slides you want, and it builds the full deck. Choose Review the outline first to check the count and order before any slide is designed, or generate straight away.
Have notes or an old deck? Upload a PDF, Word, PowerPoint, Excel, CSV, text or image file (uploads need a free account) and NOXI turns it into a structured deck. If a rehearsal runs long, ask the AI in plain language to change one slide or the whole deck. Present full-screen from NOXI, or download an editable PowerPoint or a PDF. NOXI is free, with no card and no watermark: every account gets 1,000 credits a month, and a full deck uses about 25.
Make a 7-slide deck for a 10-minute interview presentation to a hiring panel. Brief: [paste the brief]. Slides: title; my recommendation in one line with three reasons; the situation in two or three facts; the options I weighed; the plan with steps, owners and dates; results to track and the top two risks; close with the answer and what I'd need. One idea per slide, a headline that states the point, no more than 30 words of body text per slide.
For any other length, state the minutes, the slide count from the table and one line per slide. More patterns are in our presentation prompt library.
Frequently asked questions
- How many slides do I need for a 10-minute presentation?
- Six to ten content slides at a standard pace, plus a title and a closing slide. Use 3–5 if the slides are dense charts you need to explain, and 6–7 in total for a job interview presentation, as jobs.ac.uk advises.
- How many slides for a 5-minute presentation?
- Three to five content slides; jobs.ac.uk suggests 3–4 for a 5-minute interview presentation. Ignite is the exception: 20 slides that advance automatically every 15 seconds.
- How many slides for a 15-minute presentation?
- Nine to fifteen at a standard pace. For a technical conference talk, stay lower: IPDPS 2026 calls 12 technical slides the maximum for 15 minutes and 8–10 more realistic.
- How many slides for a 20-minute presentation?
- Twelve to twenty at a standard pace. For a pitch, Guy Kawasaki's 10/20/30 rule says ten slides in twenty minutes.
- How many slides for a 30-minute presentation?
- Eighteen to thirty at a standard pace, or 10–15 if most slides are charts or tables that need discussion. Subtract any Q&A time first.
- How many slides for a 1-hour presentation?
- Start from speaking time, not the slot. With 15 minutes of questions you speak for 45 minutes: 27–45 slides at a standard pace, or 15–22 for data-heavy content.
- How many minutes per slide?
- About 60–100 seconds on average in a standard talk, 2–3 minutes on a dense chart or table, and 20–30 seconds on an image. PechaKucha fixes it at 20 seconds a slide and Ignite at 15.
- What is the 10/20/30 rule?
- Guy Kawasaki's rule from 2005: a presentation should have ten slides, last no more than twenty minutes and use no font smaller than thirty points. He wrote it for startup pitches and applies it to any presentation meant to reach agreement.
- How many words is a 10-minute presentation?
- About 1,200–1,500 words, at 120–150 words a minute. The National Center for Voice and Speech puts the average rate of speech for English speakers in the United States at about 150 words a minute.
Sources & methodology
The three paces and the 120–150 words-a-minute planning range are our rules of thumb, anchored on the sources below. The worked examples are illustrative. All sources were checked on 2 October 2026.
- [1] 10/20/30 rule and its reasoning (30 December 2005) — Guy Kawasaki, The 10/20/30 Rule of PowerPoint.
- [2] 20 images × 20 seconds; created in 2003 by Klein and Dytham — PechaKucha, About.
- [3] 20 slides × 15 seconds, 5 minutes; Seattle, 2006 — Ignite Talks, About.
- [4] TEDx talk lengths — TED, TEDx Rules.
- [5] 3 minutes, one static slide — University of Queensland, 3MT competition rules; first held at UQ in 2008 — UQ, Start your 3MT journey.
- [6] 15 + 5 minutes; 12 technical slides maximum, 8–10 realistic — IPDPS 2026 Presentation Guidelines.
- [7] 12 minutes; 10–15 slides, one per minute — IASLT Conference 2026 Oral Guidelines.
- [8] "No more than 1 slide per minute of speaking time" (2012) — IEEE Ultrasonics Symposium, oral guidelines.
- [9] 15-minute slots: 12 talk, 3 questions — NCER 2026 Speaker Instructions.
- [10] 3–4 slides for 5 minutes, 6–7 for 10 (updated 31 March 2026) — jobs.ac.uk, 10 top tips for interview presentations.
- [11] Interview presentations usually last 5–15 minutes (updated 31 March 2026) — jobs.ac.uk, Presentation at an Interview.
- [12] About 150 words per minute — National Center for Voice and Speech, Voice Qualities.
- [13] 100–150 wpm for presentations; five TED talks averaging 173 (updated 20 August 2026) — VirtualSpeech.
- [14] Two minutes per slide (7 May 2024) — Plus AI.
- [15] One minute per slide, 8–12 for 10 minutes (May 2025) — Adobe Express.
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