Helpful Toolbox

Knitting Cast-On Calculator

Tell us your gauge and how wide you want your piece, and we'll do the stitch math so you can just start casting on.

📖 How it works & FAQ

Cast on the right number of stitches every time

Guessing your cast-on number is how projects end up too wide, too narrow, or one repeat short of the pattern. This calculator turns your gauge swatch into a precise stitch count: multiply your stitches-per-inch by the width you want, round to your stitch-pattern repeat, and add any edge stitches. The result is the exact number to cast on for a scarf, blanket panel, dishcloth, or the body of a sweater worked flat.

Why gauge is the whole game

Gauge is how many stitches fit in an inch (or in the standard 4-inch swatch) with your yarn and needles. Two knitters can follow the same pattern and get very different sizes because their gauge differs. Always knit and measure a swatch first, then enter that real number here & the math will match your hands, not the label. If your gauge is given over 4 inches, use the "4 inches" option and we divide it down for you.

How to use it

  1. Knit a swatch in your pattern stitch and measure your gauge.
  2. Enter your stitch count and choose whether it was measured over 1 inch or 4 inches.
  3. Enter the finished width you want the piece to be.
  4. Optionally set a stitch multiple (e.g. 4 for k2 p2 ribbing) so the count fits a full repeat.
  5. Optionally add edge or selvage stitches, then read your cast-on number.

These numbers are a planning estimate based on your swatch; knit a small gauge check before committing to a big project.

FAQ

What is a stitch multiple?
Many stitch patterns repeat over a set number of stitches, like 4 for k2 p2 rib or 6 for a cable panel. Rounding to that multiple keeps your pattern from breaking at the edge.
Why is the actual width slightly off from what I asked?
Rounding to whole stitches and to a pattern repeat shifts the count up or down a little, so we show the true finished width those stitches will produce.
Should I include border stitches?
If your pattern adds selvage or garter edges outside the main repeat, put them in the "plus edge stitches" box so they're added on top of the repeat count.
Does this work in centimeters?
Yes, just stay consistent: enter gauge and width in the same unit and read the finished width in that unit. Use the 4-inch option for the standard 10 cm swatch.