Hat Size Calculator
Find your perfect hat size using head circumference measurements
Calculate Your Hat Size
Select whether this is for an adult or child
Measure around your head about 1-2 cm above your ears
How to Measure Your Head
Step 1: Use a flexible measuring tape
Step 2: Find the widest part of your head (usually just above your ears)
Step 3: Wrap the tape around your head, keeping it level
Step 4: Leave a small gap (about 1-2 cm) above your ears
Step 5: Read the measurement where the tape meets
Adult Hat Size Chart
| Circumference | International | American | British |
|---|---|---|---|
| 20.5" / 52 cm | XS | 6 1/2 | 6 3/8 |
| 20.9" / 53 cm | XS | 6 5/8 | 6 1/2 |
| 21.3" / 54 cm | S | 6 3/4 | 6 5/8 |
| 21.7" / 55 cm | S | 6 7/8 | 6 3/4 |
| 22" / 56 cm | M | 7 | 6 7/8 |
| 22.4" / 57 cm | M | 7 1/8 | 7 |
| 22.8" / 58 cm | L | 7 1/4 | 7 1/8 |
| 23.2" / 59 cm | L | 7 3/8 | 7 1/4 |
| 23.6" / 60 cm | XL | 7 1/2 | 7 3/8 |
| 24" / 61 cm | XL | 7 5/8 | 7 1/2 |
| 24.4" / 62 cm | XXL | 7 3/4 | 7 5/8 |
| 24.8" / 63 cm | XXL | 8 | 7 3/4 |
| 25.2" / 64 cm | XXXL | 8 1/8 | 7 7/8 |
Hat Shopping Tips
Always try on hats when possible - sizes can vary between brands
Measure your head in the evening when it's slightly larger
If between sizes, choose the larger size for comfort
Consider your hairstyle - thick hair may require a larger size
Hat materials can shrink or stretch over time
Size System Differences
International
Uses letter sizes (XS, S, M, L, XL, XXL, XXXL)
American
Numerical sizes typically ranging from 6 1/2 to 8 1/8
British
Similar to American but slightly smaller (6 3/8 to 7 7/8)
Understanding Hat Sizes
How Hat Sizing Works
Hat sizes are based on the circumference of your head, measured around the largest part of your head, typically just above your ears and eyebrows. Different countries use different sizing systems, which is why we provide conversions for International, American, and British sizes.
Why Accurate Measurement Matters
- •A proper fit ensures comfort during extended wear
- •Prevents headaches from too-tight hats
- •Avoids hats falling off due to loose fit
- •Ensures the hat looks proportional and stylish
Common Hat Types & Fit
Baseball Caps
Often have adjustable straps or elastic bands. Size can be more flexible, but proper measurement ensures the crown fits comfortably.
Brimmed Hats
Fedoras, sun hats, and dress hats typically require more precise sizing as they have limited adjustability.
Winter Hats
Beanies and knit caps are often stretchy and forgiving, but proper sizing ensures they don't slip or feel too tight.
Pro Tip: When in doubt, it's generally better to go slightly larger than smaller. Many hats can be adjusted with padding or sizing strips, but a too-small hat cannot be easily enlarged.