Measure the widest part of the hips while seated and add about 1 to 2 inches for seat width. For seat depth, measure from the back of the hips to the back of the knee and subtract about 2 to 3 inches. Seat height should let feet rest on the footrests with thighs level, or reach the floor for foot-propelling. Common adult seat widths are 16, 18 and 20 inches. For daily or long-term use, a seating assessment by an occupational or physical therapist is worth it.
A chair that fits is easier to push, more comfortable and safer for skin and posture.
Measurements
| Measurement | How | Rule of thumb |
|---|---|---|
| Seat width | Widest part of hips or thighs, seated | Add 1 to 2 in |
| Seat depth | Back of hips to back of knee, seated | Subtract 2 to 3 in |
| Seat-to-floor height | Back of knee to floor, plus footrest clearance | Thighs level; lower for foot-propelling |
| Back height | Seat to below the shoulder blades (active users lower) | Supports without restricting the arms |
| Armrest height | Seat to bent elbow | Shoulders relaxed |
Measure with the person seated in their usual clothing, on a firm surface.
Chair types
| Type | Weight | Best for |
|---|---|---|
| Standard | Heavier | Occasional use, budget |
| Lightweight | Lighter | Regular self-propelling, car transport |
| Ultralight and rigid | Lightest | Active daily users |
| Transport chair | Light, small wheels | Companion pushing, travel |
| Bariatric | Heavy-duty | Higher weight capacities |
Cushions
A pressure-relieving cushion matters as much as the chair for anyone sitting for long periods. Foam, gel and air cushions differ in pressure relief and maintenance.
Getting assessed
For full-time use, a seating assessment by an occupational or physical therapist checks posture, pressure and propulsion. It is often needed for insurance coverage; see Medicare coverage.
For home access, see ramp slope and for people who can walk with support, walker vs rollator.
Browse mobility aids.
Common questions
What is a standard wheelchair seat width?
18 inches is the most common adult width, with 16 and 20 inches also standard. Bariatric chairs start around 22 inches.
What happens if a wheelchair seat is too wide?
The user leans to one side and has to reach farther to push the wheels, which strains the shoulders. Too narrow causes pressure on the hips.
What is the difference between a wheelchair and a transport chair?
A wheelchair has large rear wheels the user can push. A transport chair has small wheels and must be pushed by a companion.
Do I need a prescription for a wheelchair?
Not to buy one privately, but Medicare and most insurers require a prescription and documentation for coverage.