April 24, 2026
Finding the right hat size should be straightforward, but for most people, it is anything but. Whether you are shopping for a fitted Flexfit® cap, ordering branded headwear for your team, or helping a customer find the right size, understanding how hat sizes work is the foundation of getting it right every time.
This guide covers everything: how to measure your hat size at home, how to read a hat size chart, how sizes convert between systems, and exactly which Flexfit® size is right for your head circumference.
Why Hat Size Matters
A cap that is too small sits high on the head and creates pressure around the temples. A cap that is too large sits low, loses its shape, and looks poorly fitted. Neither serves the wearer well, and for brands investing in custom headwear, an ill-fitting cap is one that will not be worn.
Getting the right size is especially important for fitted caps. The Flexfit® Technology accommodates a range within each size bracket, but selecting the right size bracket in the first place is essential.
How to Measure Your Hat Size
Measuring your head circumference is the first step to finding your correct hat size. All you need is a flexible measuring tape or a piece of string and a ruler.
Step-by-Step: How to Measure Hat Size
- Position the tape — Wrap a flexible measuring tape around your head, approximately 2.5 cm (1 inch) above your ears and across the mid-forehead. This is the widest point of your head and the measurement point used by all cap manufacturers.
- Keep it level — Make sure the tape is horizontal all the way around, not angled up or down at any point.
- Measure firmly but not tightly — The tape should sit flush against your head without compressing the skin. A measurement that is too tight will result in a cap that is too small.
- Record in centimetres — Note your measurement in centimetres. If you are measuring in inches, multiply by 2.54 to convert to centimetres.
- Measure twice — Take the measurement twice to confirm accuracy. Even a 0.5 cm difference can move you between size brackets on some models.
Flexfit® Hat Size Chart
| Head Circumference (cm) | Head Circumference (inches) | Baseball Cap Size | Flexfit® Size |
| 43 – 46 cm | 16 ⅞ – 18 ⅛ in | 5 ⅜ – 5 ¾ | Infant |
| 45 – 47 cm | 17 ¾ – 18 ½ in | 5 ⅝ – 5 ⅞ | Toddler |
| 50 – 52 cm | 19 ⅝ – 20 ½ in | 6 ¼ – 6 ½ | Kid |
| 52 – 54 cm | 20 ⅜ – 21 ¼ in | 6 ½ – 6 ¾ | Youth |
| 53 – 56 cm | 20 ¾ – 22 in | 6 ⅝ – 7 | XS/S |
| 54 – 57 cm | 21 ¼ – 22 ⅜ in | 6 ¾ – 7 ⅛ | XS/M |
| 55 – 58 cm | 21 ⅝ – 22 ¾ in | 6 ⅞ – 7 ¼ | S/M |
| 57 – 60 cm | 22 ⅜ – 23 ½ in | 7 ⅛ – 7 ½ | M/XL |
| 58 – 61 cm | 22 ¾ – 23 ⅞ in | 7 ¼ – 7 ⅝ | L/XXL |
| 56 – 59 cm | 22 – 23 ⅛ in | 7 – 7 ⅜ | ONE Size |
Note: If your head measurement falls between two size brackets, size up for a more comfortable fit.
How Do Hat Sizes Work?
The Three Sizing Systems
Hat sizes are expressed differently depending on the market and tradition. Understanding the three main systems helps when comparing caps across brands or regions.
Centimetres (cm) — The most straightforward system. Your head circumference in centimetres maps directly to the size chart above.
Inches — Used widely. To convert your cm measurement to inches, divide by 2.54. A head circumference of 57 cm, for example, equals approximately 22.44 inches.
Fractional hat sizes — The traditional system used historically and still referenced on many baseball caps. These fractions represent the diameter of the head (circumference divided by π). A size 7 hat, for example, corresponds to a head diameter of 7 inches, or a circumference of approximately 56 cm.
Medium Hat Size — What Does It Mean?
The term “medium hat size” is commonly used but rarely precise. In the context of Flexfit® caps, the closest equivalents are:
- S/M — fits head circumferences of 55 – 58 cm (the smaller medium range)
- M/XL — fits head circumferences of 57 – 60 cm (the larger medium range)
Most adults who consider themselves a “medium” will fall into one of these two brackets. Measure your head circumference to confirm which is right for you rather than relying on a generic medium designation.
Big Size Hats — What to Know
For people with larger head circumferences, typically above 59 cm, finding the right cap can be more challenging than for average sizes. Flexfit® addresses this directly with its size range:
- L/XXL — 58 – 61 cm head circumference
- XXL — available on some models for head circumferences above 61 cm
Bucket Hat Sizes
Bucket hats follow the same head circumference measurement principle but are typically offered in one size. The relaxed construction of bucket hats provides more flexibility across measurements than structured fitted caps.
Hat Size Tips for Wholesale and Brand Buyers
For businesses ordering branded Flexfit® caps in bulk, whether for a team, corporate programme, or retail range, sizing logistics is an important consideration.
For fitted cap orders: Collect individual head measurements from all wearers and map each to the size chart above. Order the correct quantities per size bracket. Allow for a small buffer in the most common sizes (S/M and M/XL for most adult groups).
For adjustable cap orders: One size simplifies ordering significantly. Snapback and strapback styles from the YP Classics® range eliminate the need for individual sizing, making them a practical choice for large groups, events, and promotional headwear programmes. For retail assortments: Stock S/M and M/XL as your primary sizes, with L/XXL as a secondary. Infant, Toddler, Kid, and Youth sizes are relevant if your retail audience includes children and families.
Frequently Asked Questions About Hat Sizes
Q. How do I know my hat size?
Measure the circumference of your head approximately 2.5 cm above your ears and across the mid-forehead using a flexible measuring tape. Match your measurement in centimetres to the Flexfit® size chart above.
Q. What is the most common hat size for men?
Most adult men fall within the S/M (55–58 cm) or M/XL (57–60 cm) range.
Q. What does hat size 7 mean?
Hat size 7 is a fractional hat size referring to the diameter of the head in inches. It corresponds to a head circumference of approximately 56 cm
Q. What size Flexfit® cap do I need for a 58 cm head?
A head circumference of 58 cm falls within both the M/XL (57–60 cm) and L/XXL (58–61 cm) brackets. M/XL is the right starting point. If you prefer a slightly more relaxed fit, L/XXL will accommodate comfortably.
Q. Can I order Flexfit® caps in XXL for a big head?
Yes. Flexfit® offers XXL sizing on select models for head circumferences above 61 cm.
Shop Flexfit® Caps in the Right Size
FF Headwear Middle East is an Authorized Distributor of Yupoong® / Flexfit® caps across the Middle East region, offering the full range of fitted and adjustable styles across all available sizes — for wholesale customers, and brands building custom headwear programmes.
👉 Contact FF Headwear Middle East
*Flexfit® and Yupoong® are registered trademarks of Yupoong, Inc., used under authorization. FF Headwear is an Authorized Distributor.
