Cast-On by Project
Pick a project, enter your gauge, and get a starting stitch count for a typical finished size. Flat pieces use the width; a cowl or hat uses the circumference, and a hat takes a little negative ease so it stays on.
The size is a common starting point you can change. For a hat, enter the wearer’s head measurement, not the finished hat; the tool takes the ease off for you.
Cast on
36 stitches
Across the flat width.
Before you cast on
Round to the multiple your stitch pattern needs, and for the round add the repeat for your crown or join. This does not add selvedge or edge stitches, and it assumes an even fabric.
Need a custom width, or the row count too? Use the gauge calculator →
Gauge standard: Craft Yarn Council, Standard Yarn Weight System
Cast-on by project FAQ
How many stitches should I cast on for a scarf?
Multiply your stitches-per-centimetre gauge by the width you want. A common scarf is about 20 cm wide, so at 18 stitches per 10 cm that is roughly 36 stitches. Enter your own gauge and width above, then round to whatever your stitch pattern repeat needs.
How many stitches do I cast on for a hat?
A hat is worked in the round and needs negative ease so it stays on, so you cast on for a circumference a little smaller than the head. Enter the wearer's head measurement and the tool takes about ten percent off before multiplying by your gauge. Then round to the multiple your crown decrease or stitch pattern needs.
What is negative ease and why does a hat need it?
Ease is the difference between the finished piece and the body it goes on. Negative ease means the piece is smaller than the body and stretches to fit, which is what keeps a hat snug. Flat pieces like a scarf or blanket use no ease, so they are cast on at their full width.
Do I still need to swatch?
Yes. The cast-on count is only as accurate as the gauge you enter, and gauge changes with your yarn, needle or hook, stitch, and tension. Work a swatch in the project stitch, wash and block it, then measure the gauge and use that number here.