Really handy knitting calculator with a lot of great functions. It works as a knitting needle measuring device, it determines gauge and counts stitch numbers.

When you have made a knitting swatch, you use this calculator to figure out how many stitches and rows you need in your project. The frame is placed on top of the swatch, and then it is very easy to count the number of stitches and rows per 4” (10 cm).