A wheelchair that fits well is safer, more comfortable and easier to push. Getting the size right takes three measurements and two decisions. Grab a tape measure and have the user sit in a firm, flat chair.
Step 1: Measure seat width
Measure across the widest point of the hips or thighs while seated. Add about 1 to 2 inches. That is your seat width.
- 16 inch: smaller adults
- 18 inch: the most common adult size
- 20 inch: larger adults
- 22 to 30 inch: bariatric chairs, usually rated 500 lb and up
A seat that is too narrow presses on the hips. One that is too wide makes the wheels hard to reach and the chair harder to fit through doors.
Step 2: Measure seat depth
Measure from the back of the hips to the back of the knee, then subtract about 2 inches. You want 2 to 3 finger-widths of space between the front edge of the seat and the back of the knee, so the seat doesn't press on the leg.
Step 3: Check seat height
Measure from the back of the knee to the heel. If the user will propel the chair with their feet ("foot-propelling"), choose a lower seat height, often called "hemi height." Otherwise a standard seat height works for most people.
Step 4: Choose a frame type
| Type | Best for | Watch for |
|---|---|---|
| Standard (K1) | Occasional use, lowest cost | Heavier to lift into a car |
| Lightweight (K3) | Daily use, frequent car trips | Slightly higher cost |
| Transport chair | Short trips when someone else pushes | Small rear wheels; user cannot self-propel |
| Reclining | Long sitting periods, swelling, limited trunk control | Longer and heavier |
| Bariatric | Users over about 300 lb or who need a wider seat | Overall width at doorways |
Step 5: Pick arms and leg rests
- Desk-length arms are shorter in front, so the user can roll up to a table.
- Full-length arms give more support when standing up.
- Removable or flip-back arms make side transfers to a bed or car easier.
- Swing-away footrests move out of the way for standing and transfers.
- Elevating leg rests raise the legs, which helps after knee surgery or with swelling.
Don't forget the doorways
Measure your narrowest doorway with the door fully open, then compare it with the chair's overall width (usually about 7 to 8 inches more than the seat width). Check the bathroom door too.
Popular choices
- 18" K3 lightweight wheelchair with desk arms and elevating leg rests
- Cruiser III 18" lightweight wheelchair
- DynaRide reclining wheelchair, 16 to 22 inch seats
- Bariatric wheelchair, 22 or 24 inch seat, 500 lb
- Carex transport chair, 19 inch seat
See every model in our wheelchair collection. For heavier users, read our bariatric equipment guide. Add comfort with a gel seat cushion.
Frequently asked questions
What is the most common wheelchair size?
An 18 inch seat width fits most average-size adults.
Should I add a cushion?
Yes, for anyone sitting more than an hour or two a day. A cushion improves comfort and helps spread pressure. Factor its thickness into seat height.
Can a facility order several chairs?
Yes. Nursing homes and rehab centers can request volume pricing through our contact page.
This guide is general information. For complex seating needs, ask a physical or occupational therapist for a seating assessment.