how much ease for knit

Hi Nehzat, I am sewing a fitted, pullover top (t shirt), In a moderate stretch cotton knit. How much ease should there be in the sleeve for this knit top and knits in general at the sleeves.

I measured the entire armhole on the seamline, omitting the seam allowances and got 18 1/4 inches. I did the same to the sleeve and got 20 1/2 inches, so I guess the ease amount is 1 1/4 inch.

Is this okay for a knit top or should I reduce it a bit?

I know I should be using metric, it's more accurate, I was raised on standard and I'm trying to remember to use metric in sewing.

Thanks so much for your help, I really appreciate you.

Veronica