The Craft Yarn Council hat size chart runs from preemie at 9 to 12 in. (23 to 30.5 cm) to man at 22 to 24 in. (56 to 61 cm), and stitches around = head circumference plus ease, times your stitches per inch. Choose a size from the chart or type your own measurement, add the gauge from your swatch, and the calculator returns the number of stitches around the hat, so you do not have to do the sum yourself.
How do you use the hat size calculator?
The form has four steps, and the result updates as you go, so you can change any box and watch the count move. Ease starts at 0.
- Choose a size from the chart, or type a head circumference you measured, and pick inches or centimetres in the Measured in box.
- If you chose a chart size, pick the smaller or the larger end of its range.
- Enter the gauge from your swatch, which is the stitches and the width they cover, 4 in. or 10 cm.
- Add ease if wanted, in the same unit as the head measurement.
The result is the stitch count for one round that goes around the head.
How do you read the result?
The calculator adds your ease to the head circumference, then multiplies by your stitches per inch and rounds to a whole stitch. A gauge counted over 4 inches is divided by 4 first, and a gauge counted over 10 cm is divided by 10, with the head measurement converted at 2.54 cm to 1 inch.
For example, take the small end of the woman’s range, 21 in., and a gauge of 16 stitches over 4 in. That is 4 stitches per inch, so 21 x 4 gives 84 stitches around with no ease. If your pattern repeats over a set number of stitches, adjust the total to the nearest count that fits the repeat.
The metric version works the same way. With a head of 56 cm and a gauge of 14 stitches over 10 cm, that is 1.4 stitches per centimetre, so 56 x 1.4 gives 78 stitches around, rounded to a whole stitch. Change the ease and the count moves with it, which is why the box starts at 0 and leaves the choice to you.
What is the crochet hat size chart?
The chart gives the Craft Yarn Council head circumference for seven sizes, from preemie to man.
| Size | Head circumference (in.) | Head circumference (cm) |
|---|---|---|
| Preemie | 9 to 12 | 23 to 30.5 |
| Baby | 14 to 16 | 35.5 to 40.5 |
| Toddler | 16 to 18 | 40.5 to 46 |
| Child | 18 to 20 | 45.5 to 51 |
| Tween | 20 to 22 | 51 to 56 |
| Woman | 21 to 23 | 53 to 58.5 |
| Man | 22 to 24 | 56 to 61 |
The sizes overlap: a tween is 20 to 22 in. and a woman is 21 to 23 in., so 21 to 22 in. fits both. Use the real head whenever you can.
What hat sizing mistakes should you avoid?
- Skipping the gauge swatch. Gauge is personal, so a count built on someone else’s stitches may not fit. A swatch of at least 4 inches square works, and 6 to 8 inches is better because the edges can distort the reading.
- Measuring the swatch at the edge. Count in the middle, because edges can affect the reading.
- Expecting a height. The council chart gives circumference only. This page gives no hat height, so follow your pattern for how deep the hat should be.
- Mixing units. Keep the head circumference, the ease and the gauge base in a matching unit, or let the calculator convert for you.
Choose the hook and yarn first with the hook size chart and the yarn weight chart. Then see the shapes this count goes into on crochet beanie patterns.
Questions makers ask
Which size do I choose if a head falls between two sizes?
Chart sizes overlap, so a tween at 20 to 22 in. and a woman at 21 to 23 in. share 21 to 22 in. Measure the actual head, type that circumference, and let the calculator use it. The chart is a guide, not a rule.
Should I use the smaller or larger end of a size range?
The calculator lets you pick either end of a chart range. The ends differ by two inches for a woman, 21 and 23, and that changes the stitch count. Measure the head, or choose the end closer to it. Ease is a separate choice.
Why does my stitch count change when I add ease?
Ease is added to the head circumference before the total is multiplied by your stitches per inch. At 4 stitches per inch, each inch of ease adds 4 stitches. The ease box starts at 0, so the count matches the bare head until you change it.
Does the chart include a hat height?
No. The council head circumference chart gives circumference only, so this page states no hat height. Try the hat on as you work and stop when it reaches where you want it to sit, or follow the height in your pattern.
