The knitting calculator by Prym is an indispensable tool when knitting pullovers and other pieces of clothing. It can help determine pin gauges, count stitches and rows, and convert the desired amount of stitches and rows for any desired clothing size and yarn thickness. First, the amount of stitches and rows per 10 cm is calculated using the counting frame. Then the knitting calculator's slider can be set to the calculated value on a scale of 8 to 49 stitches per 10 cm. A viewing window directly shows the stitch and row count for lengths 1cm to 100cm.