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 NameDining

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.

How the result changes with User height (in)

User height (in): Standing height in inches. Used to estimate proportions if specific measurements aren't provided.
Popliteal height (in, 0=auto): Floor to back of knee while seated. Enter 0 to estimate from height.
Seated hip breadth (in, 0=auto): Widest point of hips when seated. Enter 0 to estimate from height.
Chair use: Purpose determines angles and proportions. Dining is most upright, lounge is most reclined.
Cushion thickness compressed (in): Compressed cushion thickness. Lowers the wood seat pan accordingly.

Seat height from floor (in): Height of the seat surface (or frame if cushioned) from the floor.
Seat depth (in): Front-to-back seat depth with 2" behind-knee clearance.
Seat width (in): Minimum seat width with hip clearance.
Backrest angle from vertical (deg): Recommended backrest recline angle.
Seat tilt back-to-front (deg): Recommended downward slope from back to front of seat.
Lumbar support center (in above seat): Height of lumbar support peak above the seat surface.
Backrest height (in): Total backrest height above the seat surface.
Armrest height above seat (in): Natural elbow rest height above the seat.
Overall chair height (in): Total height from floor to top of backrest.

Identify Input Parameters
4 parameters
User height (in) = 68, Popliteal height (in, 0=auto) = 0, Seated hip breadth (in, 0=auto) = 0, Chair use = 0 = 5 input(s) provided
Calculate Seat height from floor
17 = 17
Calculate Seat depth
Seat depth = seatDepth - 2
7.9 = 7.9
Calculate Seat width
14.6 = 14.6
Calculate Backrest angle from vertical
7 = 7