Quick answer: The average hat size is about 7⅜ for men (a head circumference of roughly 23 inches / 58 cm) and 7¼ for women (about 22½ inches / 57 cm). Anything 7½ and above is larger than average — "big head" territory — and it's exactly where standard hats start to run out of room.
Average hat size at a glance
| Group | Average US hat size | Head circumference (in) | Head circumference (cm) |
|---|---|---|---|
| Men | 7⅜ | ~23" | ~58 cm |
| Women | 7¼ | ~22½" | ~57 cm |
| Typical adult range | 6⅞ – 7⅝ | 21⅝" – 24" | 55 – 61 cm |
What counts as a big head?
If you measure 7½ or above (23½" / 60 cm+), your head is larger than average — and you've likely noticed most hats don't fit right. That's not a problem with your head. Most "one size fits all" and standard fitted hats simply top out around 7⅝, and they scale width rather than crown depth as they get bigger, so a big head ends up with a hat perched on top instead of sitting down properly.
Big-head sizes generally run from 7½ up to 8¼ (about 60–66 cm). If you land in that range, you're not an outlier — you just need a hat actually built for it.
How to find your own hat size
Wrap a soft tape measure (or a piece of string) around your head about an inch above your ears and eyebrows, read it in inches, and match it to a chart. Our big head hat size guide walks through it step by step and shows the full size chart.
Where above-average heads go
MONGO hats are built specifically for sizes 7½ to 8¼ — with a deeper crown and an extended-range snapback — so an above-average head gets a hat that fits like it should. Shop XL hats for big heads →
Quick answers
What is the average hat size for a man?
About 7⅜, which is a head circumference of roughly 23 inches (58 cm).
What is the average hat size for a woman?
About 7¼, or roughly 22½ inches (57 cm).
What hat size is bigger than average?
Anything 7½ and up (23½ inches / 60 cm or more) is above average and considered a big head.
Is a 7¾ a big head?
Yes — 7¾ (about 24¼ inches / 62 cm) is well above the average of 7⅜, and most standard hats don't offer it.