How many slides for a presentation? a rule of thumb by length and type

The table below starts from one slide per minute and gives a sensible range. The low end suits talks with questions, demos or discussion; the high end suits talks where you move quickly through visuals. Count only content slides: a title slide and a closing slide come on top.

A slide should carry one idea. Introducing it, explaining it and linking it to the next one usually takes around a minute when you speak at a calm pace. Much faster, and the audience reads the slide while you talk instead of listening. Much slower, and the screen stays frozen while your story moves on, which makes the talk feel longer than it is.

The rule is also a planning tool: if your outline needs 25 slides for a 10 minute slot, you have too much content, not too few minutes. Cut ideas before you shrink fonts.

A well-known public guideline for pitches comes from venture capitalist Guy Kawasaki: a pitch should have 10 slides, last no more than 20 minutes and use no font smaller than 30 points. It was written with startup pitches in mind, but the logic applies widely: a short deck, time left for discussion, and text large enough that you cannot paste paragraphs on a slide.

Notice that it gives 2 minutes per slide, not one: a pitch is a conversation. For a pitch structure, see our pitch deck generator page.

1. Write one sentence per slide: the idea the audience must remember. If you cannot, merge or cut the slide.
2. Rehearse out loud with a timer, at least twice. Note slides that take over two minutes: split them; slides under 20 seconds: merge them.
3. Reserve time for questions: in a 20 minute slot with 5 minutes of Q&A, plan for 15 minutes of slides.
4. Move details to backup slides after the conclusion. They answer questions without slowing the talk.
5. Plan where to cut: mark two slides you can skip if you run late.

Slidy is an AI presentation maker: you type a topic, paste a text or add a PDF, Word, Excel, PowerPoint or text file, choose between 5 and 35 slides, and get a first deck in about 15 to 25 seconds. It never invents figures (missing numbers appear as "XX" for you to fill). You edit the text in the browser, and exporting an editable .pptx costs €2.99, or €9.99 for 5 exports, with no subscription. Every account gets 2 free AI presentations every week. Slidy has no co-editing and no slide reordering, so pick your slide count first.