Hat Size Conversion Chart – AU, US, UK, EU & CM
Hat Size Conversion Chart – AU, US, UK, EU & CM
This hat size conversion chart helps you compare common hat sizing systems used in Australia (AU), the United States (US), the United Kingdom (UK), and Europe (EU), using head circumference in centimetres (CM) as the primary reference. Because hat fit varies by brand and style, head measurement is usually more reliable than the size label alone.
📏 How to Measure Your Head (CM)
- Use a soft tape measure (or string and ruler).
- Wrap it around your head where the hat will sit: just above the eyebrows, above the ears, and around the widest part at the back.
- Keep the tape level and comfortably snug (not tight).
- Record the measurement in centimetres (CM).
- If between sizes, many people choose the larger size for comfort.
🧢 Adult Hat Size Conversion
| Head Circumference (CM) | Hat Size (Inches) | US / UK | EU | Alpha Size |
|---|---|---|---|---|
| 54 | 21 1/4 | 6 3/4 | 54 | S |
| 55 | 21 5/8 | 6 7/8 | 55 | S |
| 56 | 22 | 7 | 56 | M |
| 57 | 22 3/8 | 7 1/8 | 57 | M |
| 58 | 22 3/4 | 7 1/4 | 58 | L |
| 59 | 23 1/8 | 7 3/8 | 59 | L |
| 60 | 23 1/2 | 7 1/2 | 60 | XL |
| 61 | 23 7/8 | 7 5/8 | 61 | XL |
| 62 | 24 1/4 | 7 3/4 | 62 | XXL |
| 63 | 24 5/8 | 7 7/8 | 63 | XXL |
| 64 | 25 | 8 | 64 | XXXL |
🧒 Kids Hat Size Chart (Approximate)
| Approx. Age | Head Circumference (CM) | Alpha Size |
|---|---|---|
| 0–6 months | 40–44 | XS |
| 6–12 months | 44–46 | XS / S |
| 1–2 yrs | 46–48 | S |
| 2–4 yrs | 48–50 | S / M |
| 4–6 yrs | 50–52 | M |
| 6–10 yrs | 52–54 | M / L |
🧢 Cap Size Guide (Fitted, Snapback & Adjustable)
- Fitted caps: Use numeric sizing (e.g. 7 1/4). Choose the closest match to your head circumference in CM.
- Snapback caps: Adjustable via snaps; typically fit a range (e.g. 56–60 cm).
- Adjustable caps: Use straps, buckles, or velcro and usually fit a wider CM range.
- Flex-fit caps: Use alpha sizes (S/M/L) with elastic stretch; check the CM range carefully.
If you are between sizes or prefer a looser fit, many people size up for fitted caps and rely on adjustables for casual wear.
📌 Hat Sizing Tips
- Head circumference in CM is the most consistent reference across regions.
- EU hat sizes often match CM measurements directly.
- Hair thickness, lining, and materials can affect fit.
- When unsure, choose the larger size or an adjustable style.
⚠️ Important Disclaimer
This hat size conversion chart is provided for general informational purposes only. All measurements and conversions are approximate and may vary by brand, hat style, materials, manufacturing tolerances, regional labelling practices, and individual head shape. No warranty or guarantee (express or implied) is made regarding accuracy, fit, or suitability. You are solely responsible for verifying sizing using the official sizing guide provided by the relevant brand or retailer before purchase. This content does not constitute professional fitting, medical, or consumer advice.
