Early sizing studies
Use bitragion width to set fit targets before physical prototyping.
Measurement
Bitragion Width
25 years · United States
Bitragion Width for fit, clearance, and sizing decisions across populations.
Lateral bitragion width for clearance, fit envelopes, and spatial packaging.
Male–female median gap
Difference between median predictions for the 25yo US cohort.
1.0 cm (8%)
Median male is 1.0 cm larger than median female
Design accommodation range
5th to 95th percentile span for the 25yo US cohort (cm).
Male
- Low
- 13.2 cm
- Median
- 14.0 cm
- High
- 14.8 cm
Female
- Low
- 12.3 cm
- Median
- 13.0 cm
- High
- 13.6 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.
- Jaw WidthMale 12.1Female 11.3cm
- Head To TragionMale 13.2Female 12.7cm
- Bitragion WidthCurrentMale 14.0Female 13.0cm
- Head To Nose TipMale 14.7Female 14.7cm
- Face BreadthMale 15.1Female 14.2cm
- Head BreadthMale 15.5Female 14.5cm
Typical applications
Accommodation bands
Choose percentile ranges for the people you need to include.
Cross-market work
Compare bitragion width 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 bitragion width for the ages, percentiles, genders, and countries you design for. Start with a free API key.