How to Convert Hat Sizes
Converting hat sizes helps when shopping internationally. Hat sizes are based on head circumference.
US hat sizes correlate to head circumference in inches. Multiply US size by π (3.1416) to get inches, then convert to cm. UK sizes are about 1/8 smaller than US. For example, US 7.25 ≈ 58 cm circumference.
For accurate sizing, measure around your head just above the eyebrows and ears.
Quick Tips
- 1 mile = 1.609 km (miles are bigger)
- 1 kg = 2.205 lbs (roughly double + 10%)
- Temperature: (°F - 32) × 5/9 = °C
Frequently Asked Questions
Measure head circumference just above eyebrows and ears with a soft tape.
US 7.25 (approximately 58 cm) is average for men; 7 (56 cm) for women.
Yes, and by hat style. Fitted caps differ from stretch-fit styles.
Size up for comfort, or look for adjustable options.