Calculating from individual days
The settings under 'Start | Settings | Miscellaneous' on the 'Value calculation' tab must be as follows:
The number of weeks is calculated as follows:
(number of days on which lessons are held) / (number of teaching days per week) = (number of weeks)
In this example lessons are held on 188 days of the school year and on 5 days per week, resulting in the following calculation:
188 / 5 = 37.6
The yearly value for Newton's one period, lesson number 4, is therefore also 37.6.