Written and maintained by CASRAI Editorial Board
Published · Last updated
This page describes products and general use; it is not medical advice.
On this page
A wheelchair scale weighs a person while they remain seated in their wheelchair, by rolling the chair onto a low platform. Clinic staff, buyers and students use this page to understand what the device is, how the common designs differ, which published accessibility dimensions apply, and how the weight of the chair is handled.
What a wheelchair scale is
A wheelchair scale is a platform scale built so that a wheelchair can be rolled onto it, usually by way of a ramp. Under US regulation it falls within the generic device called a patient scale. 21 CFR 880.2720 defines a patient scale as a device intended for medical purposes that measures the weight of a patient who cannot stand on a scale, and lists designs placed under a bed or chair, sling designs that lift the patient from a bed, and designs where the patient is placed on the scale platform. The regulation does not use the term wheelchair scale; a platform scale for wheelchairs is a patient scale only to the extent that the platform design in that text applies. The device may be mechanical, battery powered or AC powered (21 CFR 880.2720, checked 2026-10-30).
Under the same section, a patient scale is Class I (general controls) and is exempt from premarket notification (510(k)), subject to the limitations in 21 CFR 880.9.
How it is built
The Job Accommodation Network (JAN) product listing for a dual-scale wheelchair unit describes the typical parts: two platform scales, a side ramp, a guard rail along one side, a dial that reads in 1 lb increments, hand holes for carrying, and ramp and scale that store on edge. That listing describes one example product, not every model, and is a listing rather than instructions for use (JAN, checked 2026-10-30).
Types and variants
| Type | How the person is weighed | Key difference | Source |
|---|---|---|---|
| Platform scale | The patient is placed on the scale platform | The design class closest to a wheelchair platform; the person is weighed together with the chair unless the chair weight is deducted | 21 CFR 880.2720 |
| Under-bed or under-chair scale | Weighs both the support and the patient | The support is part of what is weighed | 21 CFR 880.2720 |
| Sling scale | Patient is lifted by a sling from a bed | No wheelchair involved; listed for contrast | 21 CFR 880.2720 |
| Dual-scale unit with ramp (example product) | Chair rolls onto two scales, both readings are added, then the chair weight is deducted | Two platforms plus a side ramp and guard rail | JAN listing |
| Extra-wide wheelchair scale (example product) | Same principle, for oversized wheelchairs | Wider platform: 24-1/2 in long by 39 in wide, 600 lb capacity | JAN listing |
Sizes and specifications that matter
The only manufacturer-side figures on this page come from the JAN listing and apply to the example products it describes, not to wheelchair scales in general.
| Specification | Standard unit in the listing | Extra-wide unit in the listing |
|---|---|---|
| Weight capacity | 600 lb | 600 lb |
| Dial increment | 1 lb | Not stated in the listing |
| Platform | 24-1/2 in long; 34 in wide scale-to-scale | 24-1/2 in long by 39 in wide |
| Height off the floor | 2-1/2 in, with side ramp | Not stated in the listing |
| Unit weight | About 26 lb with ramp | Not stated in the listing |
Accessibility dimensions that can apply
The US Access Board’s medical diagnostic equipment standards (36 CFR part 1195, checked 2026-10-30) set dimensions for wheelchair spaces on diagnostic equipment. They concern accessibility, not weighing accuracy. Section M302.1 includes an exception: where weight scales contain wheelchair spaces complying with M303 and also provide a seat integral to the equipment, the scales are not required to comply with M302.
| Item | Requirement in the standard | Section |
|---|---|---|
| Wheelchair space width | 36 in (915 mm) minimum; 32 in (815 mm) on a raised platform, to a height of 4 in (100 mm) above the platform surface | M303.2.2 |
| Depth, front or rear entry | 48 in (1220 mm) minimum | M303.2.3.1 |
| Depth, pass-through entry | 40 in (1015 mm) minimum | M303.2.3.2 |
| Depth, side entry | 60 in (1525 mm) minimum | M303.2.3.3 |
| Surface slope | Not more than 1:48 in any direction | M303.2.5 |
| Edge protection on a platform raised more than 1 1/2 in | At least 2 in (51 mm) high on each side not providing entry or exit | M303.2.6 |
| Level changes at entry | Changes of 1/4 in (6.4 mm) or less may be vertical | M303.3.1 |
| Ramp running slope and width | No steeper than 1:12 (1:8 allowed for runs up to 2 1/2 in high); clear width at least 36 in (915 mm) | M303.3.3.1, M303.3.3.3 |
How to choose
Only criteria stated in the sources can be given here. The JAN listing separates a standard unit from an extra-wide unit for oversized wheelchairs, so platform width relative to the chair is a listed difference. The listing also states a weight capacity (600 lb for both example units). Where a scale is meant to provide a wheelchair space under the Access Board standards, the dimensions in the table above are the stated minimums.
Safe use and handling basics
The JAN listing describes a guard rail along one side and a side ramp for wheelchair access. The Access Board standard calls for edge protection on raised platforms and a ramp no steeper than 1:12 (with the 1:8 exception for low runs). For the correct procedure on any specific model, follow the manufacturer’s instructions for use.
Common mistakes
The mistake the JAN listing points to directly is reporting the combined weight. For its dual-scale unit, the two readings are added, and then the wheelchair weight is deducted. Leaving out that deduction records the person and the chair together.
FAQ
Is a wheelchair scale a regulated medical device?
Under 21 CFR 880.2720 a patient scale, which includes designs where the patient is placed on the scale platform, is a Class I device exempt from 510(k) premarket notification, subject to the limitations in 21 CFR 880.9. The regulation does not name wheelchair scales specifically.
How is the weight of the wheelchair handled?
For the dual-scale example in the JAN listing, the weights on both scales are added and the wheelchair weight is then deducted. Other models may differ, so follow the manufacturer’s instructions for use.
What ramp slope do the Access Board standards allow?
Ramp runs may not be steeper than 1:12, with a 1:8 allowance for runs up to 2 1/2 in high, and the clear width must be at least 36 in (M303.3.3).
Related pages
Compare other weighing equipment in the physician scale guide and the infant scale guide. For the chairs and mobility equipment being weighed, see wheelchair parts, power chair dimensions, the standing frame guide and bariatric beds. Equipment in this category is also listed under diagnostic, monitoring and imaging supplies.
Sources
- 21 CFR 880.2720, Patient scale, https://www.ecfr.gov/current/title-21/part-880/section-880.2720, checked 2026-10-30.
- 36 CFR part 1195 appendix, Medical Diagnostic Equipment Accessibility Standards (US Access Board), sections M302.1 and M303, https://www.ecfr.gov/current/title-36/part-1195, checked 2026-10-30.
- Job Accommodation Network, Platform Scales for Wheelchair product listing, https://askjan.org/products/Platform-Scales-for-Wheelchair.cfm, checked 2026-10-30.
