Early sizing studies
Use buttock knee length to set fit targets before physical prototyping.
Measurement
Buttock Knee Length
Buttock Knee Length for fit, clearance, and sizing decisions across populations.
Linear buttock knee length for product fit, reach envelopes, and human factors studies.
Male–female median gap
Difference between median predictions for the 25yo US cohort.
2.8 cm (5%)
Median male is 2.8 cm larger than median female
Design accommodation range
5th to 95th percentile span for the 25yo US cohort (cm).
Male
- Low
- 54.5 cm
- Median
- 59.1 cm
- High
- 63.8 cm
Female
- Low
- 51.7 cm
- Median
- 56.3 cm
- High
- 60.6 cm
Male vs female distribution
Predicted values at key percentiles for 25-year-olds in the United States (cm).
Related legs measurements
Median values for nearby legs peers in the 25yo US cohort (cm). Male and female medians as paired bars when both are available.
- Buttock Popliteal LengthMale 50.0Female 48.0cm
- Knee HeightMale 55.0Female 50.0cm
- Sitting Upper Leg LengthMale 57.7Female 55.0cm
- Buttock Knee LengthCurrentMale 59.1Female 56.3cm
- Upper Leg Length SittingMale 59.1Female 56.3cm
- Thigh Circumference MidpointMale 59.6Female 57.6cm
Typical applications
Accommodation bands
Choose percentile ranges for the people you need to include.
Cross-market work
Compare buttock knee length 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 buttock knee length for the ages, percentiles, genders, and countries you design for. Start with a free API key.