Head circumference to hat size
Find your head circumference in centimeters or inches and read across to the hat size each fitted brand chart lists for it. Download the full table as a CSV.
By Fitness Hats Editorial Team, published November 3, 2026. Brand charts checked October 4, 2026
By centimeters
Half-centimeter steps. The inch and US size columns are computed (1 in = 2.54 cm; US size is circumference over pi, to the nearest eighth, the convention). The brand columns are each chart's own answer, from its published numbers.
| Head, cm | Head, in | US size (computed) | New Era 59FIFTY fitted | Richardson Fitted | Under Armour Hat size table | Lamood Big Hats Size chart |
|---|---|---|---|---|---|---|
| 50.0 | 19.69 | 6 1/4 | below chart | below chart | below chart | below chart |
| 50.5 | 19.88 | 6 3/8 | below chart | below chart | below chart | below chart |
| 51.0 | 20.08 | 6 3/8 | below chart | 6 3/8 | below chart | below chart |
| 51.5 | 20.28 | 6 1/2 | below chart | 6 3/8 / 6 1/2 | below chart | below chart |
| 52.0 | 20.47 | 6 1/2 | below chart | 6 1/2 | below chart | below chart |
| 52.5 | 20.67 | 6 5/8 | below chart | 6 1/2 / 6 5/8 | below chart | below chart |
| 53.0 | 20.87 | 6 5/8 | below chart | 6 5/8 | 6 5/8 | below chart |
| 53.5 | 21.06 | 6 3/4 | below chart | 6 5/8 / 6 3/4 | 6 5/8 / 6 3/4 | below chart |
| 54.0 | 21.26 | 6 3/4 | below chart | 6 3/4 | 6 3/4 | below chart |
| 54.5 | 21.46 | 6 7/8 | below chart | 6 3/4 / 6 7/8 | 6 3/4 / 6 7/8 | below chart |
| 55.0 | 21.65 | 6 7/8 | 6 7/8 | 6 7/8 | 6 7/8 | below chart |
| 55.5 | 21.85 | 7 | 6 7/8 / 7 | 6 7/8 / 7 | 6 7/8 / 7 | below chart |
| 56.0 | 22.05 | 7 | 7 / 7 1/8 | 7 | 7 | below chart |
| 56.5 | 22.24 | 7 1/8 | 7 / 7 1/8 | 7 / 7 1/8 | 7 / 7 1/8 | below chart |
| 57.0 | 22.44 | 7 1/8 | 7 1/8 / 7 1/4 | 7 1/8 | 7 1/8 / 7 1/4 | below chart |
| 57.5 | 22.64 | 7 1/4 | 7 1/8 / 7 1/4 | 7 1/8 / 7 1/4 | 7 1/8 / 7 1/4 | below chart |
| 58.0 | 22.83 | 7 1/4 | 7 1/4 / 7 3/8 | 7 1/4 | 7 1/4 / 7 3/8 | 7 1/4 |
| 58.5 | 23.03 | 7 3/8 | 7 1/4 / 7 3/8 | 7 1/4 / 7 3/8 | 7 1/4 / 7 3/8 | 7 3/8 |
| 59.0 | 23.23 | 7 3/8 | 7 3/8 / 7 1/2 | 7 3/8 | 7 3/8 / 7 1/2 | 7 3/8 |
| 59.5 | 23.43 | 7 1/2 | 7 1/2 | 7 3/8 / 7 1/2 | 7 3/8 / 7 1/2 | 7 1/2 |
| 60.0 | 23.62 | 7 1/2 | 7 1/2 / 7 5/8 | 7 1/2 | 7 1/2 / 7 5/8 | 7 1/2 |
| 60.5 | 23.82 | 7 5/8 | 7 5/8 | 7 1/2 / 7 5/8 | 7 5/8 | 7 5/8 |
| 61.0 | 24.02 | 7 5/8 | 7 5/8 / 7 3/4 | 7 5/8 | 7 5/8 / 7 3/4 | 7 5/8 |
| 61.5 | 24.21 | 7 3/4 | 7 3/4 | 7 5/8 / 7 3/4 | 7 3/4 | 7 3/4 |
| 62.0 | 24.41 | 7 3/4 | 7 3/4 / 7 7/8 | 7 3/4 | 7 3/4 / 7 7/8 | 7 3/4 |
| 62.5 | 24.61 | 7 7/8 | 7 7/8 | 7 3/4 / 7 7/8 | 7 7/8 | 7 7/8 |
| 63.0 | 24.8 | 7 7/8 | 7 7/8 / 8 | 7 7/8 | 7 7/8 / 8 | 7 7/8 |
| 63.5 | 25 | 8 | 8 | 7 7/8 / 8 | 8 | 8 |
| 64.0 | 25.2 | 8 | above chart | 8 | 8 / 8 1/8 | 8 |
| 64.5 | 25.39 | 8 1/8 | above chart | above chart | 8 1/8 | 8 1/8 |
| 65.0 | 25.59 | 8 1/8 | above chart | above chart | 8 1/8 / 8 1/4 | 8 1/8 |
| 65.5 | 25.79 | 8 1/4 | above chart | above chart | 8 1/4 | 8 1/4 |
| 66.0 | 25.98 | 8 1/4 | above chart | above chart | above chart | 8 1/4 |
| 66.5 | 26.18 | 8 3/8 | above chart | above chart | above chart | 8 3/8 |
| 67.0 | 26.38 | 8 3/8 | above chart | above chart | above chart | 8 3/8 |
| 67.5 | 26.57 | 8 1/2 | above chart | above chart | above chart | 8 1/2 |
| 68.0 | 26.77 | 8 1/2 | above chart | above chart | above chart | 8 1/2 |
| 68.5 | 26.97 | 8 5/8 | above chart | above chart | above chart | 8 5/8 |
| 69.0 | 27.17 | 8 5/8 | above chart | above chart | above chart | 8 5/8 |
| 69.5 | 27.36 | 8 3/4 | above chart | above chart | above chart | 8 3/4 |
| 70.0 | 27.56 | 8 3/4 | above chart | above chart | above chart | 8 3/4 |
“a / b” means the chart lists no size for that head, only a on one side and b on the other. “below chart” and “above chart” mean the head falls outside the chart. The CSV adds 0 more fitted charts.
By inches
Quarter-inch steps, the way most tape measures in the US are marked.
| Head, in | Head, cm | US size (computed) | New Era 59FIFTY fitted | Richardson Fitted | Under Armour Hat size table | Lamood Big Hats Size chart |
|---|---|---|---|---|---|---|
| 19 1/2 | 49.5 | 6 1/4 | below chart | below chart | below chart | below chart |
| 19 3/4 | 50.2 | 6 1/4 | below chart | below chart | below chart | below chart |
| 20 | 50.8 | 6 3/8 | below chart | below chart | below chart | below chart |
| 20 1/4 | 51.4 | 6 1/2 | below chart | 6 3/8 / 6 1/2 | below chart | below chart |
| 20 1/2 | 52.1 | 6 1/2 | below chart | 6 1/2 | below chart | below chart |
| 20 3/4 | 52.7 | 6 5/8 | below chart | 6 1/2 / 6 5/8 | below chart | below chart |
| 21 | 53.3 | 6 5/8 | below chart | 6 5/8 / 6 3/4 | 6 5/8 / 6 3/4 | below chart |
| 21 1/4 | 54.0 | 6 3/4 | below chart | 6 3/4 | 6 3/4 | below chart |
| 21 1/2 | 54.6 | 6 7/8 | below chart | 6 3/4 / 6 7/8 | 6 3/4 / 6 7/8 | below chart |
| 21 3/4 | 55.2 | 6 7/8 | 6 7/8 / 7 | 6 7/8 / 7 | 6 7/8 / 7 | below chart |
| 22 | 55.9 | 7 | 7 | 7 | 7 | below chart |
| 22 1/4 | 56.5 | 7 1/8 | 7 / 7 1/8 | 7 / 7 1/8 | 7 / 7 1/8 | below chart |
| 22 1/2 | 57.1 | 7 1/8 | 7 1/8 / 7 1/4 | 7 1/8 | 7 1/8 / 7 1/4 | below chart |
| 22 3/4 | 57.8 | 7 1/4 | 7 1/4 | 7 1/8 / 7 1/4 | 7 1/4 | below chart |
| 23 | 58.4 | 7 3/8 | 7 1/4 / 7 3/8 | 7 1/4 / 7 3/8 | 7 1/4 / 7 3/8 | 7 3/8 |
| 23 1/4 | 59.1 | 7 3/8 | 7 3/8 / 7 1/2 | 7 3/8 | 7 3/8 / 7 1/2 | 7 3/8 |
| 23 1/2 | 59.7 | 7 1/2 | 7 1/2 | 7 3/8 / 7 1/2 | 7 1/2 | 7 1/2 |
| 23 3/4 | 60.3 | 7 1/2 | 7 1/2 / 7 5/8 | 7 1/2 / 7 5/8 | 7 1/2 / 7 5/8 | 7 5/8 |
| 24 | 61.0 | 7 5/8 | 7 5/8 / 7 3/4 | 7 5/8 | 7 5/8 / 7 3/4 | 7 5/8 |
| 24 1/4 | 61.6 | 7 3/4 | 7 3/4 | 7 5/8 / 7 3/4 | 7 3/4 | 7 3/4 |
| 24 1/2 | 62.2 | 7 3/4 | 7 3/4 / 7 7/8 | 7 3/4 / 7 7/8 | 7 3/4 / 7 7/8 | 7 3/4 / 7 7/8 |
| 24 3/4 | 62.9 | 7 7/8 | 7 7/8 / 8 | 7 7/8 | 7 7/8 / 8 | 7 7/8 |
| 25 | 63.5 | 8 | 8 | 7 7/8 / 8 | 8 | 8 |
| 25 1/4 | 64.1 | 8 | above chart | 8 | 8 / 8 1/8 | 8 / 8 1/8 |
| 25 1/2 | 64.8 | 8 1/8 | above chart | above chart | 8 1/8 / 8 1/4 | 8 1/8 |
| 25 3/4 | 65.4 | 8 1/4 | above chart | above chart | 8 1/4 | 8 1/4 |
| 26 | 66.0 | 8 1/4 | above chart | above chart | above chart | 8 1/4 / 8 3/8 |
| 26 1/4 | 66.7 | 8 3/8 | above chart | above chart | above chart | 8 3/8 |
| 26 1/2 | 67.3 | 8 3/8 | above chart | above chart | above chart | 8 1/2 |
| 26 3/4 | 67.9 | 8 1/2 | above chart | above chart | above chart | 8 1/2 |
| 27 | 68.6 | 8 5/8 | above chart | above chart | above chart | 8 5/8 |
| 27 1/4 | 69.2 | 8 5/8 | above chart | above chart | above chart | 8 5/8 / 8 3/4 |
| 27 1/2 | 69.8 | 8 3/4 | above chart | above chart | above chart | 8 3/4 |
The charts behind the columns
Where each brand column comes from.
- New Era 59FIFTY fitted checked 2026-10-04
- Richardson Fitted checked 2026-10-04
- Under Armour Hat size table checked 2026-10-04
- Lamood Big Hats Size chart checked 2026-10-04
Fitted caps only: these are the charts that print US size labels. Stretch-fit, adjustable and letter sizes are in the hat size chart and calculator.
Frequently asked questions
What hat size is 58 cm?
A 58.0 cm head is 22.83 inches around, which is US size 7 1/4 by the convention (inches divided by pi, to the nearest eighth). Brands round differently, so check the chart: King & Fifth The Jack (fitted): M (22 1/2 to 23 1/8 in, 57 to 58.9 cm); Lamood Big Hats Size chart: 7 1/4 (22 3/4 to 22 7/8 in, 57.8 to 58.1 cm); New Era 59FIFTY fitted: between 7 1/4 (22 3/4 in, 57.7 cm) and 7 3/8 (23 1/8 in, 58.7 cm); New Era says to go up, so 7 3/8; Richardson Fitted lists 7 1/4 (22 3/4 in, 58 cm); Under Armour Hat size table: between 7 1/4 (22 3/4 in, 57.8 cm) and 7 3/8 (23 1/8 in, 58.7 cm), and the brand does not say which way to go.
What hat size is a 22 inch head?
A 22 inch head is 55.9 cm, which is US size 7 by the convention (22 divided by pi, to the nearest eighth). Brands round differently, so check the chart: King & Fifth The Jack (fitted): S (21 3/4 to 22 3/8 in, 55 to 56.9 cm); Lamood Big Hats Size chart: outside its chart; New Era 59FIFTY fitted lists 7 (22 in, 55.8 cm); Richardson Fitted lists 7 (22 in, 56 cm); Under Armour Hat size table lists 7 (22 in, 55.9 cm).
What hat size is a 23 inch head?
A 23 inch head is 58.4 cm, which is US size 7 3/8 by the convention (23 divided by pi, to the nearest eighth). Brands round differently, so check the chart: King & Fifth The Jack (fitted): M (22 1/2 to 23 1/8 in, 57 to 58.9 cm); Lamood Big Hats Size chart: 7 3/8 (23 to 23 1/4 in, 58.2 to 59.1 cm); New Era 59FIFTY fitted: between 7 1/4 (22 3/4 in, 57.7 cm) and 7 3/8 (23 1/8 in, 58.7 cm); New Era says to go up, so 7 3/8; Richardson Fitted: between 7 1/4 (22 3/4 in, 58 cm) and 7 3/8 (23 1/8 in, 59 cm); Richardson says to go up, so 7 3/8; Under Armour Hat size table: between 7 1/4 (22 3/4 in, 57.8 cm) and 7 3/8 (23 1/8 in, 58.7 cm), and the brand does not say which way to go.
Why do two brands give different sizes for the same head?
Each brand publishes its own chart and rounds it its own way, so a head can sit exactly on one brand’s size and between two on another’s. Where that happens the table shows both neighboring sizes, written "a / b", and does not choose for you.
Keep going
- Hat Size Converter: Your Size in Every Brand, CSV and PDF
Pick the hat you wear and see the matching published size on every other brand chart, then download the full cross-brand table as CSV or a printable PDF.
- How to Measure Your Head for a Hat
Where the tape goes, how snug to pull it and how to read it, with or without a tailor’s tape, then turn the number into your size in any brand.
- Printable Head Measuring Tape (Calibrated PDF)
A free printable tape for measuring your head for a hat: 0 to 72 cm with inches, on Letter or A4, with a bank-card and 10 cm check for print scale.
- Hats for Big Heads: Which Brand Charts Go Up to Your Size
Enter your head size and see which brands publish a hat size that covers it, the largest size each chart lists, and the source page for every number.