Hat Size Converter
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Crosswalk US fitted hat sizes and head circumference in cm or inches.
Rates last reviewed: July 2026
Your hat size
Head circumference
58 cm
US 7 1/4 · 22.75 in
- US fitted
- 7 1/4
- Inches
- 22.75 in
- Centimeters
- 58 cm
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Hat and cap sizing
US fitted hat sizes (6 3/4, 7, 7 1/4…) are based on head circumference — the number roughly equals head diameter in inches multiplied by π, though labels use fractional inch steps. Measuring your head in centimeters is the most reliable way to match a cap chart.
Wrap a soft tape around the forehead where the hat sits — about 1 cm above the ears. Snug but not tight. Compare your cm measurement to the brand chart; fitted, adjustable, and stretch caps fit differently.
Example: 58 cm head ≈ US 7 1/4 fitted hat ≈ 22.75 in circumference. Between sizes? Size up for beanies, down for structured caps — or choose adjustable styles.
Common questions
How do I measure head circumference?
Use a flexible tape measure around the widest part of your head, just above the ears and eyebrows. Record cm or inches and match the closest row in this chart.
Do all hat brands use US fitted sizes?
Many US cap brands use fitted fractions; European brands often list cm only. One-size and adjustable hats may not map to this chart.
Should I round up or down?
If you are between sizes, round up for comfort with fitted caps and structured hats. Stretch beanies tolerate a tighter fit.