Size chart for hats

Is there a size chart anywhere that will tell you how many stitches you need to start with (cast on) for certain size hats? I have seen charts that tell you how to figure out the circumference for the different sizes but I would like to know how to figure out how many stitches that I need to use.



I think this is what you’re looking for, but remember that sizes vary based on the circumference of the head. My young nephews had adult size heads early so kid sizes didn’t fit them.