Early sizing studies
Use hair line to set fit targets before physical prototyping.
Measurement
Hair Line
25 years · United States
Hair Line for fit, clearance, and sizing decisions across populations.
Hair Line as a population dimension for early fit, sizing, and ergonomics work.
Design accommodation range
5th to 95th percentile span for the 25yo US cohort (cm).
Male
- Low
- 3.8 cm
- Median
- 3.9 cm
- High
- 4.0 cm
Female
- Low
- 3.8 cm
- Median
- 3.9 cm
- High
- 4.1 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.
- Nose BreadthMale 2.7Female 2.6cm
- Hair LineCurrentMale 3.9Female 3.9cm
- Ear BreadthMale 4.1Female 3.3cm
- Lip LengthMale 5.1Female 4.3cm
- Nose LengthMale 5.3Female 4.8cm
- Ear LengthMale 6.6Female 5.3cm
Typical applications
Accommodation bands
Choose percentile ranges for the people you need to include.
Cross-market work
Compare hair line 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 hair line for the ages, percentiles, genders, and countries you design for. Start with a free API key.