I know I've seen a chart for pinwheel sizes but I can't find it anywhere. I'm working on 3.5" pinwheel squares. If I use the 1/4" seam around 2 squares method do I start with 5.25" squares?

If I use the 2nd method of placing 2 squares together, draw a diagonal, sew on both sides and divide, are my squares 4" to get a 3.5"pinwheel square?