Presentation length calculator
Drop the deck and see how long each slide takes to say, at your pace. Or paste a script.
Three steps, done
Drop your PPTX
Drag a .pptx onto the page, or paste the script you plan to read.
Every slide is counted
Speaker notes are counted where a slide has them; otherwise the words on the slide itself.
Set your pace
Slow, normal or fast, plus a pause per slide. The per-slide times and the total update as you switch.
Your deck, with a voice
Narrated PowerPoint
Every slide voiced by an AI voice, timed to auto-advance. Download the .pptx and press play.
Narrate every slide of my PowerPoint with a natural voice and give me the narrated .pptxMP3 narration
The whole deck as one clean audio file, or one clip per slide.
Read my PowerPoint aloud and give me the MP3Deck from a brief
Describe the talk. Noty writes the slides, designs them and narrates them.
Make me a narrated presentation aboutYour own voice
Clone your voice once and every deck sounds like you presenting.
Narrate my deck in my cloned voiceVideo export
SoonThe narrated deck rendered as an MP4 for YouTube, LMS or email.
Tell Noty you want videoOne deck in, a runtime out
Before
A deck and a time slot
“You have 15 minutes.” Twenty-four slides, notes on some of them, and no idea whether it fits.
After
Talk time, slide by slide
Words and seconds for every slide, the total speaking time, and the total with pauses — so you know what to cut.
Stop timing it. Let Noty say it.
A calculator tells you how long it should take. A narrated deck takes exactly that long, every time. Tell Noty in the Studio chat — it writes the narration from your notes and slides, voices every slide, and hands back a PowerPoint that auto-advances with the narration.
How long should a presentation be?
There’s no single right length, but there are good defaults. Use them to sanity-check the number the calculator gives you.
1–2 minutes per slide
The most common rule. A 20-slide deck lands at 20–40 minutes. Title and section slides go faster; data slides go slower.
130–150 words per minute
Comfortable speaking pace in English. Nervous presenters speed up to 170+; slow down for technical material or a big room.
Pauses add up
Two seconds between slides is barely noticeable, but over 30 slides it’s a full minute. Build it in.
Leave room for Q&A
If the slot is 30 minutes, aim for 20–25 minutes of talk. Questions always take longer than you planned.
The 10/20/30 rule
A pitch favourite: 10 slides, 20 minutes, no font under 30 points. It forces you to say less and mean it.
Pace differs by language
Words per minute vary between languages — Spanish and Italian are spoken with more, shorter words; German with fewer, longer ones. Adjust the pace to match.
Timing a presentation, three ways
Most calculators take a block of text and divide by 150. PowerPoint’s rehearsal mode times you — but only once you’ve stood up and presented the whole thing.
| Notevibes | Word-count calculators | Rehearse in PowerPoint | |
|---|---|---|---|
| Reads the deck’s notes and slides | |||
| Per-slide breakdown | |||
| No rehearsal needed | |||
| Generates the narration | |||
| Cloned voice | |||
| Video export | Soon | Export only |
Use the free calculator above to plan the runtime. When you want it delivered the same way every time, tell Noty — it narrates every slide and hands back the .pptx and the MP3.
Notes vs slide text: what the calculator reads
A slide and its speaker notes do different jobs. The slide is what the audience reads — a headline, a few bullets, a chart. The notes are what you say. So when a slide has notes, the calculator counts the notes and ignores the slide text.
When a slide has no notes, the calculator falls back to the words on the slide: its title and body text. That’s a floor, not a forecast — most people say more than the bullets show. If most of your slides are timed from slide text, expect the real talk to run longer.
Slides with neither — a full-bleed photo, a section divider — show a dash and zero words. They still get the per-slide pause, because the audience still sees them.
Words are counted by the spaces between them, which works for English and most European languages. Languages written without spaces, like Chinese or Japanese, will count low.
The simplest way to get a runtime you can trust is to have the deck narrated. Noty uses your notes where they exist, writes a script for the slides that have none, and voices every slide — so the narrated .pptx runs exactly as long as it says.
Stop guessing the runtime
Noty narrates every slide in a natural voice — or yours — and hands back a PowerPoint that plays itself, timed slide by slide.
Free to try · No credit card required
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Frequently Asked Questions
How do I calculate how long my presentation is?
Drop your .pptx into the calculator above. It counts the words each slide will take to say — from the speaker notes if the slide has them, from the slide text if not — and divides by your speaking pace. Add a pause per slide for the full runtime.
What speaking pace should I use?
Normal (140 words per minute) suits most English talks. Pick Slow (110) for technical content, a large room or a non-native audience; Fast (170) is closer to a quick conversational pace.
Why does a slide show 0 words?
The slide has no speaker notes and no text the calculator can read — typically a photo, chart or section divider. Text inside images or charts isn’t counted.
Can I use it without a PowerPoint file?
Yes. Paste your script into the text box under the dropzone and pick a pace — you get the word count and the talk time.
Is my deck uploaded?
No. The calculator reads the file on your device.
Can Notevibes narrate the deck to fit the time?
Yes. Tell Noty in the Notevibes Studio how long it should run. It narrates every slide from your notes, writes a script for slides without notes, and hands back a narrated .pptx that auto-advances plus an MP3. Pick a natural AI voice or clone your own. Video export is coming with the next update.