@Sun_String just count the number of rows per inch according to your knotting style in another bracelet you made. Then take the number of rows from a pattern you want to make and divide that by your own Rows-per-inch. I usually knot 14 rows per inch, so I know this pattern which is 33 rows (33 divided by 14 = 2.35) would be almost 2 1/2 inches for me. Depending on how long you want your finished piece to be, you could also add the same amount of rows on each end to keep the design centered. I also take into account the length of triangle ends if I'm using them and add that as well. 😊