Torso · Furniture · Core
Trunk Length
The length of the trunk from the top of the shoulder to the sitting surface.
TrunkLength
How to measure
Application
Used in chair backrest and lumbar support design to ensure the backrest spans the full length of the seated user's back.
Posture
Sit upright on a firm, flat surface with back straight.
Landmark
Measured from the bony tip of the shoulder (acromion) down to the seat surface.
Tool
Tape measure.
Assistance
A second person should hold the tape end at the acromion while the other end rests on the seat surface.
Common mistake
Slouching compresses the trunk and significantly reduces the result.
API example
Request a predicted value for a 34-year-old woman at the 50th percentile in the United States. Adjust age, percentile, gender, and country to match your design scenario.
POST https://api.humanform.app/v1/predict
Authorization: Bearer hf_live_...
Content-Type: application/json
{
"measurement": "TrunkLength",
"gender": "Female",
"age": 34,
"percentile": 50,
"country": "US",
"unit": "cm"
}Response values depend on age, percentile, gender, and country. Create a free dashboard account to run live predictions.
See design examples for worked scenarios that combine multiple measurements, or read the methodology page for percentile-based design thinking.
Explore the dataset
Humanform covers 148 measurements with country-adjusted predictions and separate female and male profiles. Browse the full inventory or read the API reference for request syntax.