How this calculator works
Speech runs at roughly 100 to 180 words per minute, and the right rate depends on the setting. A lecture at around 120 words per minute gives listeners time to absorb ideas, a conference presentation sits near 140, and fast conversational delivery reaches 180. Scripts read from a page usually run longer in practice than the arithmetic suggests, because pauses, slides and audience reactions add time on top. Pacing yourself at the preparation stage is the point: a 700 word script at 140 words per minute is five minutes flat, so a ten minute slot needs about 1,400 words.
Formula
speaking time in seconds = words / speech rate x 60. Speech rate = words / (speaking time in seconds / 60). Words needed = speech rate x (speaking time in seconds / 60).
Worked example
Seven hundred words at the presentation rate of 140 words per minute takes 700 / 140 = 5 minutes. To fill a 10 minute slot at the same pace you need 140 x 10 = 1,400 words. Delivering those 700 words in 4 minutes instead implies a rate of 175 words per minute.
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Frequently asked questions
Should I add time for pauses?
Yes. Allow roughly 5% to 10% extra for natural pauses and slide changes, so aim for about 90% of the slot in words. A five minute talk should be scripted at about four and a half minutes of speech.
What is a comfortable rate for a presentation?
About 130 to 150 words per minute. Below 120 the delivery can sound laboured, and above 170 most audiences lose detail, so aim between those and slow down for the key points.
Does the word count include slide text?
Only what you say out loud. Read the script, not the slides, because speakers rarely read slide bullets verbatim.