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standard wheelchair dimensions and accessibility measurements seat height leg length measure from the user s heel to the popliteal fold and add 2 inches to allow clearance of the footrest average adult size 19 5 to 20 5 inches the bottom of the footrest is 2 inches from the floor you can fit 2 3 fingers under the distal thigh between the thigh and the seat
Figure 45. Minimum Clearances for Seating and Tables. If wheelchair seating is beside fixed seats, clear floor space 30 in by 48 inches (760 mm by 1220 mm) minimum must be provided. If wheelchair seating is across the front of fixed seating, the minimum required clear floor space is 42 in by 48 inches (1065 mm by 1220 mm).