Specifi cations
Letter Measurement BIFMA Guideline
Height for
A
Thigh clearance +
Thighs Shoe allowance +
Popliteal height
At least 26.8”
Depth for B Buttock-knee length –
Knees Abdominal extension depth No less than 17”
Width for Not Hip breadth, sitting +
Thighs Shown Movement allowance +
Clothing allowance
No less than 19.8”
Height at C Lateral malleolus height +
Foot Level Shoe allowance 4.2”
Depth at
D
Buttock-popliteal length +
Foot Level Foot length – Abdominal
extension depth
No less than 23.5”
Height at C Lateral malleolus height +
Foot Level Shoe allowance
4.2”
Depth at Not None 6.5”
Foot Level Shown
Width at Not Hip breadth, sitting +
Foot Level Shown Movement allowance
19.8”
Sitting Height
F
Popliteal height +
for Input
Elbow rest height, sitting +
Devices (Desk)
Shoe allowance
22.2” − 28.5” (adjustable)
– Input device thickness
28.5” (non-adjustable)
Sitting Height
G
Eye height, sitting +
Complex
for VDTs
Popliteal height +
interdependencies;
(Eye Height)
Shoe allowance
allow top of screen
at eye level;
approximate height:
42.6” − 52.6”
Standing Height Not Elbow rest height,
for Input
Shown
standing + Shoe allowance
Devices (Desk) – Input device thickness
36.7” − 45.6”
Standing Height
Not
Eye height, standing +
Complex
for VDTs
Shown
Shoe allowance
interdependencies;
(Eye Height)
allow top of screen
at eye level;
approximate height:
56.9” − 69.8”
Viewing Depth H None
No less than 15.7”
from VDTs to eyes
Standing Work Seated Work
Table 9. BIFMA guidelines for desks and worksurfaces. Measurements can be
visualized using Figure 10 on page 31. All measurements are in inches.