Problem with when to decrease making hats in the round

Hi,
I have been trying to figure out when to decrease when making hats on circular needles. does it matter the guage - i am making 2 hats one with a guage of 16 stitches to 4" and one with 24 stitches to 4" but … the patter is for the 16 stitches and says to decrease at 5 inches. so do I start the decrease at 5" for the 24 stitch yarn? or do I need to start at like 4.5 inches or something? basiclally do you decrease at the same measurement regardless of the number of cast on stitches?

You start the decs when the hat is 5 (6, 7, 8) inches [B]long.[/B] It doesn’t have to do anything with the gauge of the knitting or the number of CO sts.

You will [U]start[/U] the decreases at the same 5 inch mark, but to shape the hat the same way at the top you will have to change the speed with which you decrease. Say if the top of the hat is shaped over a distance of 2 inches with the yarn that gives 16 st=4inches, yarn that is 24 sts=4 inches when worked the exact same way would not make as long a top because the stitches are not as long. I would bascially decrease it the same way, but play it by ear about when to decrease. You might, for instance find that 2 rows of even knitting between the decreases (most hats give 1) will work. You don’t have to have everything the same all the time. I mean you don’t have to have the same number of rows between decreases each time, it can vary. Try something and see what result you get and if it didn’t make a satisfactory top, rip that part out and try again.

I like rolled hats so I got a little longer before starting to decrease.