Quick answer: Underpad sizing follows the surface being protected, not the country. A 60 by 90 cm pad suits a bed or a chair where the pad must cover a broad area, while a 30 by 36 inch pad covers a narrower zone under a mobility-impaired resident. The unit difference matters because Canadian sizing is commonly quoted in centimetres and US sizing in inches, and a clinic that switches suppliers without converting can order a pad that is materially smaller than intended.
Why do the two markets quote different units?
Canada uses metric as the primary unit in health care purchasing, while the United States commonly quotes inches. The same physical pad may appear as 60 by 90 cm in one catalogue and roughly 24 by 35 inches in another. The numbers describe similar products, but they are not interchangeable when a buyer reads only the digits.
That is why a care home consolidating supply across the border should convert before comparing, and why a specification for a new contract should state both units.
Which size for which bed or surface?
The deciding factor is the area that needs protection and who is being cared for. A full bed underpad covers the central sleeping zone and the transfer area; a smaller pad suits a chair or a targeted zone for a resident who is mobile. Getting the size right reduces the number of changes, which is the real cost driver in continence care.
A pad that is too small allows leakage at the edges; a pad that is too large is wasteful and can bunch. Matching size to use is the same logic as matching absorbency to need.
| Surface | Common metric size | Approximate inches | Best used for |
|---|---|---|---|
| Full bed protection | 60 x 90 cm | about 24 x 35 in | Bed-bound residents, overnight use |
| Narrow bed or chair | 45 x 60 cm | about 18 x 24 in | Chairs, targeted zones |
| Small chair pad | 30 x 36 cm | about 12 x 14 in | Short stays, light need |
| Wheelchair or transfer | 45 x 60 cm or larger | varies by chair width | Mobile residents |
| Procedure table overlay | 60 x 90 cm or wider | about 24 x 35 in | Exam and treatment surfaces |
How does absorbency relate to size?
Size and absorbency are separate variables. A large pad with low absorbency still needs frequent changing, and a small pad with high absorbency can overflow at the edges. The correct combination follows the resident's output and mobility, which is why a brief or pad selection should start from a resident profile rather than a single default product.
For a bed-bound resident with heavy output, a full-size pad plus a high-capacity brief covers both the surface and the wearer. For a mobile resident with light output, a smaller pad and a pull-on product is the economical pairing.
How should a clinic or home standardise its stock?
List the surfaces the facility protects — beds, chairs, wheelchairs, treatment tables — then assign one or two sizes to each. Keep the number of sizes small so staff can choose confidently, and label storage by surface rather than by supplier. State both metric and imperial dimensions on the specification so a cross-border quote cannot mislead.
Review the sizes annually against actual usage. Facilities that grow or change their case mix often find that one size is now over-consumed because the resident profile has shifted.
What else should be checked with the sizing decision?
Confirm the backing is suitable for the surface, and that the pad stays in place during transfers. Where the pad is used on a shared surface, check the cleaning routine between residents. Those details decide whether the sizing decision actually works in practice.
Continent care also sits beside the facility's wider infection-control routine, including equipment reprocessing. In Ontario, the RCDSO expects a biological indicator for each sterilizer on every day it is used — daily monitoring, not weekly. The same discipline of matching the product to the task applies to pads as it does to monitoring consumables.
What should be recorded?
Record which size is stocked for which surface, the conversion between metric and imperial for each line, and the consumption rate per surface. That record makes the next specification straightforward and shows a reviewer that the choice was deliberate rather than inherited.
Where a home operates across provinces or uses a US-based supplier for part of its range, the conversion record is the safeguard against a size error that only becomes visible as an increase in leaks.
It also helps to note the pad's absorbency alongside its dimensions, because the two are chosen together. A facility that changes supplier and records only the metric size may inherit a pad with a different construction, and the difference shows up as a change in how often the pad has to be replaced rather than as an obvious defect.
Related reading
Sterilization compliance hub; 60x90cm vs 30x36 underpads compared; capacity and purchasing unit compared; LTC procurement checklist; incontinence care collection; BI 5-pack trial.
Download the underpad sizing and conversion worksheet from the incontinence supply planner, run the sterilization self-check for shared equipment, and book a sterilization compliance consultation if your documentation needs reviewing.
Ordering for a care home or multi-site group? Wholesale and multi-site ordering covers case pricing and account setup, and the B2B wholesale collection lists the lines stocked for institutional buyers. Reselling? become a distributor.
Frequently Asked Questions
What size underpad fits a standard bed?
A 60 by 90 cm pad, roughly 24 by 35 inches, covers the central sleeping and transfer zone on most beds.
Is 30 x 36 cm the same as 30 x 36 inches?
No. Metric and imperial sizing describe different physical pads. Convert before comparing, and state both units on any specification.
Does a larger pad reduce the number of changes?
Only if the absorbency also matches the resident's output. Size and absorbency are separate variables and need to be chosen together.
How many sizes should a facility stock?
Keep the number small — typically one or two sizes per surface type — and label storage by surface so staff choose confidently.
CliniEco Medical is a licensed medical device establishment (MDEL #35334).
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