A 7⅜ hat fits a head circumference of about 23⅛ inches (58.8 cm), covering heads from roughly 23.0 to 23.4 inches (58.4–59.3 cm). It is a larger-than-average size, one notch above the most common men's sizes, but still inside the range most regular hats are built for.
7⅜ hat size in inches and cm
| Hat size | Head (inches) | Head (cm) |
|---|---|---|
| 7¼ | 22¾ (22.6–23.0) | 57.9 (57.4–58.4) |
| 7⅜ | 23⅛ (23.0–23.4) | 58.8 (58.4–59.3) |
| 7½ | 23½ (23.4–23.8) | 59.8 (59.3–60.3) |
The maths: 23.17 in ÷ 3.1416 = 7.375, which is 7⅜ (written 7 3/8 on a lot of labels). Full range on the hat size chart.
How common is a 7⅜ head?
In the US Army's ANSUR II survey (4,082 men and 1,986 women measured), the median head circumference was 57.4 cm for men and 56.0 cm for women, and the 95th percentile was 60.1 cm for men and 59.7 cm for women. A 7⅜ (58.4–59.3 cm) sits between the men's median and the 95th percentile: bigger than average, but below the top 5%. For women, 7⅜ is on the large side, just under the 95th percentile.
7⅜ in New Era, Flexfit and Richardson sizes
| Brand / model | Your size |
|---|---|
| New Era 59FIFTY (fitted) | 7⅜ (23⅛ in / 58.7 cm) |
| New Era 39THIRTY (stretch) | S/M (top) or M/L (bottom); both list 23⅛ in |
| New Era 9FORTY (adjustable) | Fits: one size covers 22–23⅞ in |
| Flexfit 6277 | L/XL (7⅛–7⅝) |
| Flexfit 110 (one size) | Fits: 6½–7⅞ |
| Richardson 112 | OSFM (about 7–7¾) fits |
Brand figures come from each maker's published size chart. Details and caveats in our fitted hat size chart by brand.
Do one-size caps fit a 7⅜?
Yes, usually. A 7⅜ is inside the published range of almost every one-size cap we checked, including New Era's 9FORTY (up to 23⅞ in), the Flexfit 110 (up to 7⅞) and the Richardson 112 (about 7–7¾). You should be on a middle snap, not the last one.
Does MONGO fit a 7⅜?
Honest answer: a 7⅜ is slightly below MONGO's range. Our snapbacks are built for 7½–8½ (23.6–26.7 in / 60–68 cm). On a 7⅜ head, a MONGO will probably feel roomy even on its tightest snap, and the deeper crown will sit lower than you may want.
So for most 7⅜ heads, a regular adjustable cap is the better buy. You probably don't need an XL hat.
The exception: if you measure at the very top of the band (about 23⅜ in / 59.3 cm), or regular caps feel shallow and you're already on the last snap, you may really be a 7½. Re-measure using our measuring guide. If you land on 23.6 in or more, MONGO fits, and the 30-day fit guarantee covers you if it doesn't.
Neighbouring sizes
- 7¼ is one size down: about 22¾ in / 57.9 cm
- 7½ hat size (one size up)
- Full hat size chart
- Hat size calculator
- How to measure your hat size
7⅜ hat size FAQ
What is 7 3/8 hat size in cm?
A 7⅜ hat is about 58.8 cm, covering heads from roughly 58.4 to 59.3 cm. New Era lists its 7⅜ fitted as 58.7 cm.
What is 7 3/8 hat size in inches?
About 23⅛ inches, for heads from roughly 23.0 to 23.4 inches.
What hat size is 23 inches?
A 23-inch head rounds to a 7⅜ (23 ÷ 3.1416 = 7.32).
Is 7 3/8 a big hat size?
It is above average but not unusually big. Most one-size caps still fit a 7⅜.
Is 7 3/8 a large or XL?
Usually L. Flexfit puts it in L/XL; New Era's stretch-fit puts it on the line between S/M and M/L. Check each brand's inches.