A step-by-step home measuring guide with all 5 key dimensions — taken the right way, in the right position, with the right tools.
The 5 measurements every wheelchair buyer needs
These 5 measurements determine which wheelchair models will fit you correctly and which will cause discomfort or injury over time. All measurements are taken while seated — never standing. The human body changes shape significantly between standing and sitting, and wheelchair fit is entirely about your seated dimensions.
Measurement A — Seat width
Sit upright on a firm chair. Have a helper measure across the widest point of your hips and outer thighs. This is usually at the widest point of the hip bones, not the waist. Add 1 inch for a standard fit or 2 inches if you use thick seat cushions. This is your seat width.
Measurement B — Seat depth
Sit upright with your back against the chair back. Measure from the back of your hips to the back of your bent knee. Subtract 2 to 3 inches from this measurement. This is your seat depth. The gap between the front edge of the seat and the back of your knee prevents pressure on the back of the thigh which cuts off circulation.
Measurement C — Seat height (footrest height)
Sit with your feet flat on the floor. Measure from the floor to the back of your bent knee. This is your seat height — the distance from the floor to where the seat surface should be. Getting this right ensures your thighs are parallel to the floor, your weight distributes evenly, and your feet rest comfortably on the footrests.
Measurement D — Back height
Sit upright and measure from the seat surface to just below your shoulder blade. This gives you a mid-back support height. If you need full back support (spinal conditions, limited trunk stability), measure from the seat to the top of your shoulder. Most standard wheelchairs have back heights between 16" and 20".
Measurement E — Armrest height
Sit upright with your arms relaxed at your sides, elbows bent at 90 degrees. Measure from the seat surface to the bottom of your elbow. This is your armrest height. Correct armrest height keeps your shoulders level and prevents neck and shoulder strain during extended use.
Your measurement checklist
- Seat width: ___" (hip measurement + 1–2")
- Seat depth: ___" (hip to knee measurement minus 2–3")
- Seat height: ___" (floor to back of knee)
- Back height: ___" (seat to shoulder blade or shoulder)
- Armrest height: ___" (seat to elbow at 90 degrees)