Work out chair height setting instantly with clear inputs, formula shown and shareable results.
Seat height should equal popliteal height plus heel thickness so the feet rest flat with the thighs horizontal. Where the desk is fixed and too high, the seat must rise to bring the elbows level with the desk, roughly 24 cm above the seat, and a footrest of the difference is then essential to avoid pressure behind the knees.
Ideal seat height
Seat = popliteal height + heel height
Desk driven height
Seat = desk height - 24 cm; footrest = the difference between the two
Preliminary estimate only. Workstation set-up should be assessed individually under the display screen equipment regulations.
Seat = popliteal height + heel height. Seat height should equal popliteal height plus heel thickness so the feet rest flat with the thighs horizontal.
Dangling feet transfer body weight to the underside of the thigh, compressing blood vessels behind the knee. It causes numbness and, over time, contributes to circulatory problems.
This calculator takes 3 inputs: Popliteal height, floor to underside of the knee, Shoe heel height, Desk height. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.