Chair Ergonomics Calculator

Calculate ideal seat height, depth, width, backrest angle, and armrest height from body measurements for custom chair building.

User height (in)

Popliteal height (in, 0=auto)

Seated hip breadth (in, 0=auto)

Chair use

Cushion thickness compressed (in)

Tab to move between fields

Seat height from floor (in)

Seat depth (in)

7.9

Seat width (in)14.6

Backrest angle from vertical (deg)7

Seat tilt back-to-front (deg)3

Lumbar support center (in above seat)8.7

Backrest height (in)15.6

Armrest height above seat (in)8.8

Overall chair height (in)32.6

Use NameUnknown

How to Use This Calculator

Enter the User Height in inches — the calculator estimates seated proportions from standing height.
Enter Popliteal Height (floor to back of knee) and Seated Hip Breadth if known, or enter 0 to auto-estimate.
Select the Chair Use: dining (most upright), desk, or lounge (most reclined).
Enter Cushion Thickness (compressed) to adjust the seat height for cushioned builds.
Review Seat Height, Seat Depth, Seat Width, Backrest Angle, and Lumbar Support Height as your cutting targets.

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