GPA’s are no longer used in the Netherlands!
If the Host University asks you to provide a GPA:
You must provide the weighted average and a curriculum supplement with a Grade Distribution Table.
The GDT provides insight into how grades are distributed from high to low within a program, institution or country. The grade culture is hereby made transparent by means of a table in which all the satisfactory assessments of a program from 3 past academic years are categorized into 5 grades. The GDT thus provides insight into the distribution of the assessments given within a program and does not make a statement about the results of an individual student. Together with the weighted average, students can indicate their position in relation to the GDT.
More information can be found here.
You can request the curriculum supplement at the Student Desk team B.