Knitting Angle Calculator

This calculator will tell you on what rows to increase or decrease given the number of stitches you want to change in a given number of rows. The calculator will attempt to match to a straight line as closely as possible.

• The number of rows is how many rows you have to do the desired number of increases or decreases.
• The number of stitches is how many stitches you need to increase or decrease over the number of rows.
• The row offset lets you start the pattern at a row other than zero.
• Start with increase or decrease lets you set whether the first row will contain an increase or decrease.
• End with increase or decrease lets you set whether the last row will contain an increase or decrease.
• The matching type is how the algorithm determines when to make a stitch change. A line f(x) is formed that represents the desired shape. For each stitch, x = 0, 1, 2..., the height of the line f(x) is calculated and converted to a whole number. This number represents what row that stitch needs to be changed on. There are three methods on how the line value is converted to a whole number:
  • floor always rounds down, e.g., 4.7 → 4
  • ceiling always rounds up, e.g., 4.3 → 5;
  • round is normal midpoint rounding, e.g., 4.3 → 4 and 4.7 → 5

The source for this program is available here.