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A close up of a smart looking wheelchair with an orange frame. A young wheelchair user has their right hand on one of the wheels.

Wheelchair sizes and fitting

Find the right wheelchair with our wheelchair sizing and fitting guide. Choose the right wheelchair for comfort, safety and independence.

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The information and guidance on the Whizz Kidz Hub are for information and educational purposes only. We make no guarantees that the information is complete, safe, or suitable for every individual. Children and young people should be supervised when accessing or attempting any activities shown. We accept no liability for any injury, loss or damage arising from its use. 

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Whizz Kidz Team

Fitting a wheelchair is a physical thing and should be done by a professional. In this guide, we’re going to provide some basic information on wheelchair sizes and fitting. 

No two people are exactly the same, so wheelchairs are designed to fit a range of body shapes and sizes. 

Healthwatch estimates that hundreds of thousands of wheelchair users are in chairs that don’t fit properly. This can cause serious health problems, including pressure ulcers. 

We’re going to show you how to find a wheelchair that fits and is comfortable, safe and smooth to use.

What you’ll learn:

  • The importance of a correctly fitted wheelchair
  • How to access Wheelchair Check (and why)
  • Some of the essential things to check
  • When to get expert support

What you need to know about wheelchair sizes and fitting

A correctly fitted wheelchair is comfortable to sit in, the seat and backrest provide enough support, while enabling you to move freely and stay in control of the chair.

A properly fitted wheelchair helps prevent pain, pressure injuries, and bad posture. It also makes moving around much easier.

On the other hand, a wheelchair that’s too big, small, or poorly fitted can lead to problems with your back and other parts of your body. You’ll also be less efficient at moving and manoeuvring.

You may have heard about the 90-90-90. This is the concept that when you’re in a wheelchair you’ll have: 

  • 90° bend in the hips.
  • 90° bend in the knees.
  • 90° bend in the ankle.

There are lots of different wheelchairs on the market and they can vary slightly in terms of design and style. As a result, it’s impossible for us to provide advice and guidance. Instead, we can help provide some basic information on sizing and link to essential resources like Wheelchair Check. 

We always recommend speaking with a professional to ensure that you find a chair that fits today and for the future.

Wheelchair sizes and fitting

Here are some of the basic things you’ll need to consider when assessing whether your chair fits or doesn’t.

Seat width

The seat should be just wide enough to fit your hips comfortably, with a small gap (about 2cm) on each side. If the seat is too wide then the user can slide around. If it’s too narrow, it can cause pressure and discomfort.

Seat depth

The seat depth measures the distance from the front to the back of the chair. It should support your thighs without pressing into the back of the knees, which can be painful.

Backrest height

The backrest should be positioned in the right place so it’s comfortable without restricting movement. A higher backrest gives more support and comfort, while a lower one allows more movement. 

Armrest height

The armrests should enable you to use your arms naturally without having to lift them or slouch. Adjustable armrests can help to improve posture and reduce shoulder strain.

Footrest length

The footrest in the chair should keep your feet supported with knees at roughly a right angle (that's 90 degrees). Adjustable footplates can prevent pressure on the thighs and improve circulation.

Rear wheel position (for manual wheelchairs)

You’ll want to have free movement so you can stay in control and propel yourself forward. Your elbows should be at a right angle when your hands are on the push rims.

Seat height for foot propulsion

When you’re sitting correctly in the chair, you should be able to put your feet flat on the floor. If your feet aren’t able to be flat on the floor, your chair may need adjusting.

Check pressure

Too much pressure can cause pressure sores. You’ll want to ensure the chair is comfortable. If you can, check that the pressure under your seat bones is acceptable. 

Round up: Wheelchair sizes and fitting

This guide provides some basic information on wheelchair sizing. If you’re experiencing problems with your chair, a qualified wheelchair assessor or occupational therapist can help measure and recommend the right fit for your body and lifestyle.

While guides like this can help, we believe it’s always better to work with a professional. 

Here’s a reminder of what we’ve covered:

  • The importance of wheelchair fit
  • Why you should visit the Wheelchair Check website
  • Some of the essential wheelchair size considerations for assessing chair fit
  • Why working with a qualified professional is likely to be the best option if you’re worried about your wheelchair fit

Whizz Kidz Team

Whizz Kidz are the UK's leading charity for young wheelchair users

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