★ EVERYDAY · SIZE CHARTS · HATS
A 58 cm head is US hat size 7 1/4. Measure around your head just above the eyebrows and ears, enter the centimetres, and find your size — or look it up in the full chart below.
US hat sizes run in eighths, from 6 1/2 to 7 7/8. Enter your head circumference in centimetres and the lookup finds your size from the same chart printed below — table and calculator always agree.
Use a soft tailor's tape, not a metal ruler or a piece of string held against a ruler afterwards. Wrap the tape around your head at the point where a hat actually sits: just above the eyebrows and just above the ears, around the fullest part of the back of the head. Keep the tape level all the way around, snug enough that it does not slip, but not so tight that it dents the skin or compresses your hair more than a hat would. Read the number in centimetres, measure twice, and use the larger reading if the two differ. Hair makes a real difference: measure over the hair you will wear under the hat, and if you usually wear a hat over thick hair, do not measure with your hair tied flat and expect the same fit.
US hat sizes run in eighths, from 6 1/2 up to 7 7/8 and beyond, and each size corresponds to a head circumference: roughly speaking, the size number times π gives the circumference in inches, which is why the sizes climb by about 0.4 inches per eighth. That is a neat rule of thumb, but it is not how you should shop — brands cut differently, and a 7 1/4 from one maker can feel like a 7 1/8 from another. Use the chart to find your size, then check the maker's own centimetre range before ordering, especially for fitted caps and formal hats that cannot be adjusted. Adjustable hats with straps or snapbacks are more forgiving, but a fitted hat bought a size too small is rarely fixable, while a slightly large one can be padded with sizing tape inside the band.
| US hat size | Head circumference (in) | Head circumference (cm) |
|---|---|---|
| 6 1/2 | 20.4 in | 51.0–52.4 cm |
| 6 5/8 | 20.8 in | 52.4–53.4 cm |
| 6 3/4 | 21.2 in | 53.4–54.4 cm |
| 6 7/8 | 21.6 in | 54.4–55.4 cm |
| 7 | 22.0 in | 55.4–56.4 cm |
| 7 1/8 | 22.4 in | 56.4–57.4 cm |
| 7 1/4 | 22.8 in | 57.4–58.4 cm |
| 7 3/8 | 23.2 in | 58.4–59.3 cm |
| 7 1/2 | 23.6 in | 59.3–60.3 cm |
| 7 5/8 | 24.0 in | 60.3–61.3 cm |
| 7 3/4 | 24.3 in | 61.3–62.3 cm |
| 7 7/8 | 24.7 in | 62.3–63.3 cm |
Each size covers the band shown, and the bands join without gaps: a measurement falls in exactly one band. The inch figure is the centre circumference for the size (size × π), rounded to one decimal. Measurements below 51.0 cm take the smallest size and measurements above 63.3 cm take the largest, up to the calculator's 50–65 cm range.
| Output | Formula | What it means |
|---|---|---|
| US hat size | the band your cm measurement falls in | 58 cm falls in 57.4–58.4 cm, which is US 7 1/4. |
| Head circumference (in) | size × π, rounded to one decimal | 7.25 × π = 22.8 in. |
| Size band (cm) | midpoints between neighbouring size centres | Every measurement lands in exactly one band — no gaps, no overlaps. |
The chart follows the standard published US hat-size scale, with bands built from the midpoints between neighbouring sizes so the table and the calculator always agree. Real hats vary by brand, material, and crown shape: a wool felt hat stretches a little with wear, a stiff straw hat does not, and a deep crown fits differently from a shallow one at the same circumference. If you sit on a band boundary, or between two brands' ranges, choose the larger size. This chart covers adult sizes from 6 1/2 to 7 7/8; children's heads and very large heads need the maker's extended range.
Bright Side Kit. "US Hat Size Chart: Head Circumference to Hat Size Lookup." https://brightoolbox.com/us-hat-size-chart/ Accessed October 24, 2026.US 7 1/4. A 58 cm head circumference falls in the 57.4–58.4 cm band, which is size 7 1/4 (22.8 inches).
Wrap a soft tailor's tape around your head just above the eyebrows and ears, where a hat sits, keeping the tape level and snug but not tight. Measure in centimetres, measure twice, and use the larger reading if they differ.
For adult men, sizes around 7 1/4 to 7 1/2 (about 57–60 cm) are the most commonly stocked, which is why 58 cm — size 7 1/4 — is a useful default to remember.
Choose the larger size. A slightly loose hat can be padded inside the band with sizing tape, but a tight hat is uncomfortable and hard to stretch, especially in stiff materials.
Not exactly. Brands cut differently, so a 7 1/4 from one maker can feel like a 7 1/8 from another. Use this chart for your size, then check the maker's own centimetre range before ordering.
Roughly, the size number times π gives the head circumference in inches: 7.25 × π is about 22.8 inches. The chart's inch figures follow that rule, rounded to one decimal.
Yes — measure over the hair you will wear under the hat. Measuring with hair tied flat and then wearing the hat over thick hair will make the hat feel a size too small.
The calculator accepts 50–65 cm and gives the nearest size in the chart at the edges. Outside the chart, check the maker's extended sizes rather than forcing a fit.