Slide count calculator

How the number is worked out

The calculator takes the teaching time (the slot minus breaks) and divides it by minutes per slide for the kind of session: a talk moves at about one slide every 1.1–1.4 minutes, a lecture at one every 2–2.5 because it stops for examples, questions and board work, a lab at one every 3–4, and a seminar at one every 3.5–5 because most of the time is the room talking. Title, agenda, divider and closing slides are extra; they take seconds each.

Breaks default to none up to an hour, one up to two hours, two up to three, and the blocks between them are equal. The rhythm line (45 10 45) is the format Lecture Studio's presenter mode runs, with a countdown to each break.

Then check it against the clock

The range is for the first draft. Before the lecture, read the deck aloud once with a timer and note the minute at each divider against the plan; cut from the block that overran. The reasoning and the table by length are in how many slides for a lecture; the block-and-break pattern in breaks in a long lecture.