Raglan: how does it work?

Dear users, dear designers,
would you like to share something about the topic of raglan?

I really enjoy knitting with the raglan method because the garments always fit well, and best of all, there are no seams. When you continue knitting the body, the sleeves are set aside and then simply knitted into the body. However, I have to admit that figuring out the calculations is always a bit of a challenge.

A gauge swatch is an absolute must, and you also need to measure the desired neck circumference.