Change gauge in a pattern Pattern lists gauge and width, you want to knit the same width with a different gauge.

Calculate number of stitches to CO You have a given gauge, calculate how many stitches you need to get a given dimension.

Calculate yardage/meter on a partial ball of yarn You have a partial ball of leftover yarn, calculate the yardage of that partial ball.

Substituting similar yarns Pattern calls for a certain amount of a specific yarn, you want to know how much of a different yarn you will need for substitution.

This tool was inspired by the series “Math for Knitters” by VeryPink.