The most common reason for a wheelchair return is incorrect sizing. Too narrow causes pressure sores and discomfort. Too wide makes the chair impossible to propel and too bulky for doorways. Getting it right before you order saves weeks of delay and hundreds of dollars.
What you need
- A flexible tape measure
- A firm chair with no armrests (or removable armrests)
- A helper to hold the tape while the user sits
- A notepad
Seat width: the most important measurement
Measure across the widest part of the hips or thighs while seated. Add 1 inch on each side. Example: hips measure 17 inches at their widest. Add 2 inches total. Minimum seat width = 19 inches. Choose the next standard size up, typically a 20" seat.
Seat depth: thigh support without pressure
Measure from the back of the buttocks to the back of the knee while seated. Subtract 2 inches. The 2-inch gap at the front prevents the seat edge from pressing into the back of the knee.
Seat height: foot and floor clearance
Measure from the floor to the crease behind the knee while seated. Add 2 inches for the seat cushion if one will be used. Standard seat heights are 17–20 inches.
Back height: support vs. mobility
For active self-propelling users, a lower back height allows more shoulder freedom. For users needing full back support, measure from the seat to the top of the shoulder and choose a high-back model. Standard back height is 16–16.5 inches. High-back is 18–20 inches.
Armrest height
Measure from the seat surface to the bottom of the bent elbow while seated with shoulders relaxed. Correct armrest height prevents shoulder fatigue and supports proper posture.
