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How Many Lessons in a School Year?

Estimate total lessons for one class across the school year — from September (or your start date) to the summer end date.

Date range

Defaults approximate a Sept–mid-July year. Adjust both dates to match your school.

When does this class meet?

Select weekdays and set duration for each period. Start time is optional and improves calendar (.ics) export.

Mon

Wed

Holidays & excluded days

Add closed days from your school calendar (half-terms, inset days, bank holidays).

Set your dates and class schedule, then calculate.

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Plan these lessons in GapFiller

Turn your remaining lessons into a living timetable — free to start.

School-year lesson totals for one class

Schemes of work are often written against “about 35 weeks”, but your class may meet two or three times a week with long holidays in between. A year total based on your actual weekdays is far more useful.

This page starts from a September–July window you can edit. Add half-terms, Christmas, Easter, and inset days to see a realistic annual lesson count and hour total.

Worked example

A class meeting Mon/Wed/Fri for 50 minutes from 1 September to 15 July might look like ~100+ lessons before holidays. After adding typical half-terms and seasonal breaks, the total often lands closer to 85–95 lessons — the number you should design the year around.

Presets are a starting point only. Always enter your official start, end, and closed days.

School year FAQ

It matches many European academic calendars. Change both dates if your year starts in August, October, or another month.

With the preset start date it counts the whole year. Switch to “From today” if you only want what is left.

Yes for accuracy. Missing a two-week break can inflate the year total by six lessons or more for a thrice-weekly class.

Run the calculator twice with different weekday patterns, or export each CSV and compare in a spreadsheet.

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