A credit-weighted average, in three steps
Credits are weights, so an A in a 4-credit course moves your average four times as far as an A in a 1-credit course. Weighted GPA adds a bonus first: +0.5 for Honors, +1.0 for AP or IB, which is how an A can count as 5.0.
Don't average your semester GPAs
A term with more credits has to count for more. Total the quality points, total the credits, divide once at the end. Move the sliders to see the gap that opens up.
Rough bands on the unweighted 4.0 scale
Your band is outlined above. The number matters less than what sits behind it: admissions officers weigh course rigor, and many colleges throw out your GPA and recalculate it from core academic courses using their own grade values.