Seat Depth Buttock-Popliteal Fit Checker

Audit usable seat depth through measured behind-knee gaps across actual sample bodies, retaining signed deficits and fit coverage; not a population percentile model or safe-seat approval.

Description

Seat-depth fit is an observed behind-knee gap check.

Seat-depth fit is an observed behind-knee gap check. Sample coverage describes measured people rather than a population percentile.^[1]

Enter nonnegative usable seat depth, a nonempty positive body-length sample and an ordered two-value caller gap range. Return signed gaps, binary inclusive fit flags and observed fit percent.

When to use Seat Depth Buttock-Popliteal Fit Checker

Use Seat Depth Buttock-Popliteal Fit Checker when you need to evaluate the supplied records under the calculation and evidence rules below. No population inference or approved seating recommendation is supplied.

Prepare measured task, body, furniture or already weighted exposure records. Supply independently verified caller policies, tables and comparison limits with matching units and conditions.

How to use Seat Depth Buttock-Popliteal Fit Checker and understand its results

Prepare measured task, body, furniture or already weighted exposure records. Supply independently verified caller policies, tables and comparison limits with matching units and conditions.
Enter measuredUsableSeatDepthCm, measuredButtockPoplitealLengthsCm, callerRequiredKneeGapBoundsCm using the field table and calculation rules, then run the tool.
Read observedKneeGapsCm, callerDepthFitFlags, sampleFitPercent. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
measuredUsableSeatDepthCm	Measured usable seat depth cm	number	Required
measuredButtockPoplitealLengthsCm	Measured buttock popliteal lengths cm	list of number	Required
callerRequiredKneeGapBoundsCm	Caller required knee gap bounds cm	list of number	Required

Enter nonnegative usable seat depth, a nonempty positive body-length sample and an ordered two-value caller gap range. Return signed gaps, binary inclusive fit flags and observed fit percent.

gap=buttockPoplitealLength−seatDepth; fit=lower≤gap≤upper

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
observedKneeGapsCm	Observed knee gaps cm	list of number
callerDepthFitFlags	Caller depth fit flags	list of number
sampleFitPercent	Sample fit percent	number

json

{
  "input": {
    "measuredUsableSeatDepthCm": 40,
    "measuredButtockPoplitealLengthsCm": [
      42,
      48
    ],
    "callerRequiredKneeGapBoundsCm": [
      3,
      8
    ]
  },
  "output": {
    "observedKneeGapsCm": [
      2,
      8
    ],
    "callerDepthFitFlags": [
      0,
      1
    ],
    "sampleFitPercent": 50
  }
}

Limitations and assumptions

No population inference or approved seating recommendation is supplied.

Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Numeric lists are limited to 10,000 entries; string lists to 128 strings of at most 128 characters each. The rules above may impose smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use Chair Seat Height Popliteal Fit Checker: Loaded seat height differs from its unloaded setting. Footwear raises the measured leg-support reference. For a complementary task, use Anthropometric Hip Breadth Percentile Seat Width Fit Checker: Hip-to-seat fit includes clothing breadth and a total side-clearance allowance. It is distinct from elbow clearance at armrests.

References

Seat Depth Buttock-Popliteal Fit Checker — tool.io

Similar or alternative tools

Chair Seat Height Popliteal Fit Checker
Loaded seat height differs from its unloaded setting. Footwear raises the measured leg-support reference.
Anthropometric Hip Breadth Percentile Seat Width Fit Checker
Hip-to-seat fit includes clothing breadth and a total side-clearance allowance. It is distinct from elbow clearance at armrests.