Ireland's scale tops out at 4.2, not 4.0 — and A is 4.0, not the maximum.
This is the detail every generic calculator gets wrong. On the Irish national scale an A+ is 4.2 and a plain A is 4.0, so 4.0 is a great result but not the ceiling. Grades step down in 0.2 increments all the way to NG = 0, and the lowest passing grade is D− (2.0). Get the scale right and your GPA — and the classification it earns — matches the registry exactly.
- Use the real Irish grade points (A+ = 4.2, A = 4.0, A- = 3.8 …).
- Weight every module by its ECTS credits (most are 5; the year is 60).
- Track your GPA against 3.68 (First), 3.08 (2:1), and 2.48 (2:2).