Early sizing studies
Use head girth to set fit targets before physical prototyping.
Measurement
Head Girth
25 years · United States
Head Girth for fit, clearance, and sizing decisions across populations.
Head Girth as a population dimension for early fit, sizing, and ergonomics work.
Male–female median gap
Difference between median predictions for the 25yo US cohort.
2.3 cm (4%)
Median male is 2.3 cm larger than median female
Design accommodation range
5th to 95th percentile span for the 25yo US cohort (cm).
Male
- Low
- 55.8 cm
- Median
- 57.2 cm
- High
- 59.1 cm
Female
- Low
- 52.8 cm
- Median
- 54.9 cm
- High
- 57.3 cm
Male vs female distribution
Predicted values at key percentiles for 25-year-olds in the United States (cm).
Related head measurements
Median values for nearby head peers in the 25yo US cohort (cm). Male and female medians as paired bars when both are available.
- Head LengthMale 20.0Female 18.0cm
- Back Of Head To LipMale 20.8Female 19.3cm
- Back Of Head To Nose TipMale 22.4Female 21.1cm
- Neck CircumferenceMale 37.6Female 33.0cm
- Neck Circumference Adams AppleMale 39.1Female 34.3cm
- Head GirthCurrentMale 57.2Female 54.9cm
Typical applications
Accommodation bands
Choose percentile ranges for the people you need to include.
Cross-market work
Compare head girth across countries and cohorts from one catalog.
API example
Request a median prediction for a 25-year-old man in the United States. Replace the API key with yours from the dashboard.
Coverage at a glance
176 countries
Population coverage for cross-market work
1–88
Age span for developmental and adult cohorts
1–99
Percentile range for accommodation studies
mm, cm, in
Output units for your design system
Start with a free API key
Request head girth for the ages, percentiles, genders, and countries you design for. Start with a free API key.