It is so annoying when making a bracelet to finish it and realize that although the length is right somehow it doesn't fit correctly. When making beaded jewelry the beads take up space unlike a slinky chain bracelet. So the inside circumference has to be considered for the correct size. I found this out the hard way of course after making and restringing several bracelets.
So one of the easiest ways to correctly size a bracelet is with a cone shaped bracelet sizer. They are for sale at many bead suppliers but I recently found this handmade one. It is so easy to print at home and not wait for delivery. It is very accurate and makes your work so much easier. Check it out at http://www.how-to-make-jewelry.com/how-to-size-a-bracelet.html and don't forget to sign up for her newsletter too.