How to Estimate Word Count and Speaking Time for a Presentation
Convert a time slot into a script length, and pace your talk so you finish on time.
A typical speaking pace
Most people speak at roughly 120 to 150 words per minute when presenting. A 5-minute talk is therefore about 600 to 750 words, and a 10-minute talk about 1200 to 1500. Your pace may differ, so time yourself once.
Work backwards from the slot
Take your time limit, subtract time for questions and any demo, and multiply the rest by your pace. That gives you the word count to aim for in your script.
Slides per minute
A common guide is about one slide per minute or fewer. Slides with a lot of text take longer. If you have 15 slides for 5 minutes, cut some or combine them.
Practise with a timer
Rehearse out loud, not silently, and note the time of each section. Adjust the script where you run over, and plan the points you can drop if the previous speaker overruns.
Count what you wrote
Paste your script into a word counter and compare it with your target. Reading time and speaking time differ, so use the speaking estimate for talks.
This guide is general information. Rules differ between institutions, so confirm requirements with your college or the portal you are using.