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Plain-English guides for the calculators, with worked examples you can follow.

Paint Calculator guides

Measure the walls, subtract doors and windows, allow for two coats — and buy the right amount first time.

Guides for planning watch time, speed and study sessions.

Divide the total by 1.5. A 1:27:50 playlist takes 58:33 — you save a third, not half.

Divide total minutes by 60 and round up. 1:27:50 at an hour a day takes 2 days.

Remaining time is total minus watched. Halfway through 1:27:50, you still have 43:55 to go.

On mobile you still only see each video's length. Add them top to bottom — the last line is the total.

YouTube never shows a playlist total. Add the durations yourself — or let a calculator do it.

Divide the total by your study days. 1:27:50 over five days is about 17:30 a day.

Split at video boundaries, not mid-video. Two 30-minute sessions and a 27:50 finish.

YouTube lists videos, not totals, so the total row is blank. Here is the workaround.

Divide by 2. A 1:27:50 playlist takes 43:55 at 2x — exactly half the time.

Plan backwards from the total: lessons plus homework must fit your class time.