Millions of lessons –

The Lesson Calculator

How big is the opportunity for your school/your organisation

How many lessons can systematically be improved per academic year?


What would it mean for your pupils/students if X % of all your lessons would be systematically improved based on evidence and research?


** X teachers. 4 lessons per teacher and per school day. 183 school days per academic year.
Average for the OECD countries: 185 (primary schools) and 183 (secondary schools).