Head · Medical · Specialist
Back Of Head To Lip
The distance from the back of the head to the lips.
BackOfHeadToLip
How to measure
Application
Used in respirator, oxygen mask, and helmet chin design to position breathing apparatus at the correct distance from the rear of the head.
Posture
Head level, looking straight ahead, lips relaxed and closed.
Landmark
Measured horizontally from the centre of the closed lips (stomion) to the most rearward point of the skull.
Tool
Tape measure.
Assistance
A second person should locate the rearmost skull point and hold the tape end in place.
Common mistake
Measuring to the back of the neck rather than the skull gives a shorter and incorrect 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": "BackOfHeadToLip",
"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.