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Seat Pan Depth Calculator

If a chair's seat pan is too deep, it digs into the back of your knees, cutting off circulation. If it's too short, it doesn't support your thighs.

Stated Assumptions

  • Uses average human anthropometric ratios (femur/thigh length relative to overall height).
  • Assumes standard seated posture with knees bent at 90 degrees.

Calculate Seat Depth

Ideal Seat Depth (from backrest to edge)

Always ensure a 2-3 finger gap between the seat edge and the back of your knees.

Related Resources (Internal Links)