Gist
There is no single automatic grade for an 18-year-old in Germany. A student who remains in an academic upper-secondary school may be in Klasse 12 or Klasse 13, while another 18-year-old may attend vocational school as part of an apprenticeship, study in a different upper-secondary programme, or have already completed general schooling. See the usual class, why it applies and the main circumstances that can change the answer.
A 14-year-old in Germany is usually Klasse 8 or Klasse 9. See the main exception and the record that confirms the placement.
A 13-year-old in Germany is usually Klasse 7 or Klasse 8. See the main exception and the record that confirms the placement.
A 15-year-old in Germany is usually Klasse 9 or Klasse 10. See the main exception and the record that confirms the placement.
A 11-year-old in Germany is usually Klasse 5 or Klasse 6. See the main exception and the record that confirms the placement.
A 12-year-old in Germany is usually Klasse 6 or Klasse 7. See the main exception and the record that confirms the placement.
A 10-year-old in Germany is usually Klasse 4 or Klasse 5. See the main exception and the record that confirms the placement.
A 8-year-old in Germany is usually Klasse 2 or Klasse 3. See the main exception and the record that confirms the placement.
A 9-year-old in Germany is usually Klasse 3 or Klasse 4. See the main exception and the record that confirms the placement.