Hat Size Chart & Fitted Hat Converter
Enter one head measurement to see the nearest fitted-size row, adjacent sizes, and a brand-dependent alpha guide.
Brand chart first: fitted and S/M/L ranges vary by maker, style, and how snug you like a hat. This lookup is a reference, not a fit guarantee.
Hat size chart: 53–64 cm
US fitted and metric rows follow the cited Baruch chart. UK labels follow the cited Lock & Co. Hatters chart. Alpha bands are broad ToolNeko guides because brands use different ranges.
Swipe left to see UK, EU, and alpha sizes →
| Head circumference | US fitted | UK reference | EU / cm | Typical alpha band |
|---|---|---|---|---|
| 53 cm20.9 in | US 6⅝ | UK 6½ | 53 | S/Mbrand-dependent |
| 54 cm21.3 in | US 6¾ | UK 6⅝ | 54 | S/Mbrand-dependent |
| 55 cm21.7 in | US 6⅞ | UK 6¾ | 55 | S/Mbrand-dependent |
| 56 cm22 in | US 7 | UK 6⅞ | 56 | S/Mbrand-dependent |
| 57 cm22.4 in | US 7⅛ | UK 7 | 57 | M/Lbrand-dependent |
| 58 cm22.8 in | US 7¼ | UK 7⅛ | 58 | M/Lbrand-dependent |
| 59 cm23.2 in | US 7⅜ | UK 7¼ | 59 | M/Lbrand-dependent |
| 60 cm23.6 in | US 7½ | UK 7⅜ | 60 | M/Lbrand-dependent |
| 61 cm24 in | US 7⅝ | UK 7½ | 61 | L/XLbrand-dependent |
| 62 cm24.4 in | US 7¾ | UK 7⅝ | 62 | L/XLbrand-dependent |
| 63 cm24.8 in | US 7⅞ | UK 7¾ | 63 | L/XLbrand-dependent |
| 64 cm25.2 in | US 8 | UK 7⅞ | 64 | L/XLbrand-dependent |
How to measure your head for a hat
Use a soft tape measure. Wrap it around the widest part of your head, passing about 1 inch (2.5 cm) above your eyebrows and just above your ears. Keep the tape level and comfortably snug without pulling it tight. Take the measurement twice; use the result you can repeat.
How this hat size chart chooses a row
The adult reference runs from 53 to 64 cm in 1 cm steps. The tool converts inch input to centimeters without rounding first, then compares the measurement with the actual midpoint between adjacent rows. A value on one row or closer to it gets one nearest reference. A value exactly halfway between rows keeps both choices.
US fitted, UK, EU, and alpha labels
The metric and US fitted rows follow the Baruch College conversion chart. EU labels here repeat the centimeter circumference. UK labels follow the Lock & Co. Hatters conversion chart. The S/M, M/L, and L/XL bands are intentionally broad because Nike, New Era, and other makers publish different ranges for different products.
What to do when two sizes appear
Open the exact product's chart and compare both rows. Follow that maker's boundary advice, then consider whether you prefer a snug or relaxed fit. Materials, inner bands, crown shape, hair, and stretch can change the fit. The converter does not apply a universal “always size up” rule.
Limits of this reference
This page covers a common adult range and does not include kids' sizes, product inventory, custom hat recommendations, or a fit guarantee. A hat labeled 58 cm can also have a different stated circumference from the measurement that feels best. For an expensive or final-sale purchase, confirm the seller's chart and return policy.
Frequently asked questions
How do I use this hat size chart?
Measure around the widest part of your head, about 1 inch above your eyebrows, and enter the circumference in centimeters or inches. The tool finds the nearest row in the adult 53–64 cm reference chart. An exact midpoint keeps both neighboring rows visible.
What hat size is 58 cm?
In this reference, 58 cm maps to US fitted size 7¼, UK reference 7⅛, and EU 58. The broad alpha guide is M/L, but S/M/L ranges vary by brand and style.
What hat size is a 22.5-inch head?
22.5 inches equals 57.15 cm, so the closest row in this chart is 57 cm: US fitted 7⅛, UK reference 7, and EU 57. Confirm the product's own size chart before ordering.
Should I size up when I am between hat sizes?
Start with the brand's own instructions. Some sellers recommend the larger size at a boundary, while fit preference, hat style, sweatband, hair, and materials can change the better choice. This tool shows both rows instead of applying a universal size-up rule.
Are US, UK, EU, and S/M/L hat sizes universal?
No. The fitted references are useful comparisons, and EU labels commonly track head circumference in centimeters, but brands can label and cut products differently. Alpha ranges are especially variable.
Does the result guarantee that a hat will fit?
No. This is a general adult reference. Head shape, hairstyle, product construction, stretch, and preferred snugness can all affect fit. Use the exact brand and product chart for a purchase.