Underpad sizing is decided by the resident, not by the shelf. The two dimensions that matter are the surface area under the resident and the size of the bed or chair the pad sits on, and the same pad can be right for one resident and useless for the next. A pad that is too small shifts under a moving resident; a pad that is too large bunches under a hoist transfer and creates a pressure point.
The profiles below cover the situations care homes meet most often, with the dimension that fits each one.
How do the common pad sizes differ?
Underpads are described in centimetres in Canada and often in inches in supplier catalogues, which is the source of most ordering errors. A 60 x 90 cm pad is roughly 24 x 35 in, and a 30 x 36 in pad is roughly 76 x 91 cm. They are not the same product: the metric pad is narrower, and the imperial pad is longer and wider.
| Resident profile | Setting | Suggested pad size | Why |
|---|---|---|---|
| Bed-bound, high-care | Long-term care bed | 60 x 90 cm with a heavier core | Full coverage under the pelvis and sacrum, less pad to reposition during turns |
| Mobile with assistance | Bed and chair | 30 x 36 in | Fits chair transfers and stays flat under a resident who moves |
| Chair-bound during the day | Wheelchair or geri chair | Smaller chair pad or 60 x 90 cm folded | A full bed pad does not sit in a chair without bunching |
| Overnight, extended interval | LTC bed | 60 x 90 cm with a heavier core | Longer interval means higher total fluid load |
| Paediatric or small-framed adult | Care bed | Smaller pad, higher change frequency | Oversized pads create folds under a smaller body |
| Bariatric | Bariatric bed | Widest pad available | Standard pads shift and expose the mattress edge |
Which size suits a bed-bound resident?
A 60 x 90 cm pad with a heavier core is the usual answer. The narrower metric footprint covers the pelvis and sacrum without extending to the bed edges, which means staff are handling less material during a turn. For residents on a two-hourly turning routine, the smaller footprint is also easier to position correctly under a resident who cannot assist.
The equivalent imperial pad is wider and reaches further along the bed, which suits a resident who moves around during the night and can shift a narrower pad out of position.
Which size suits a mobile resident?
A 30 x 36 in pad or a dedicated chair pad. The dimension that matters here is not coverage but stability: a mobile resident will move the pad, so the pad needs enough body to stay flat and enough absorbency to cover the interval between changes. A large pad under a resident who transfers independently is the classic cause of a pad discovered folded in half.
Our comparison of 60 x 90 cm and 30 x 36 in pads for Canadian facilities runs the two formats side by side, and the dimension selection guide for care homes covers chair pads in more detail.
How does the change routine change the size decision?
Longer intervals push the choice toward more absorbency rather than more area. A care home that moves from a two-hourly to a four-hourly routine on a night shift should change the pad specification upward, not add a second pad underneath. Stacking pads is the single most common sizing error in long-term care, because it produces a thick, unstable surface and doubles consumption without improving containment.
The way to validate a sizing decision is a short structured trial. Our review of a Manitoba care home that cut waste with sizing charts shows what the recorded data looked like and how the home used it to standardise.
How does pad size connect to brief size?
The two work together. A brief and an underpad that overlap in coverage double up on material without adding protection, while a brief with no pad leaves the sheet exposed during a change. The usual pattern is a brief matched to the resident's mobility plus an underpad matched to the bed, with the pad providing the backup layer rather than the primary containment.
Two formats cover most care homes: a 60 x 90 cm five-layer pad with a superabsorbent core for bed-bound residents, and a 30 x 36 in heavy-absorbency pad for mobile residents and chair use.
Care homes trialling a size change can run two case quantities side by side before committing — request a bulk quote with the resident mix and the change intervals in use, and the quantities can be set to match the trial length.
Ordering for a clinic, lab or care home? Wholesale and multi-site ordering covers case pricing and account setup, and the B2B wholesale collection lists the lines stocked for institutional buyers.
Related reading
- Underpad Sizing for Canadian Facilities: 60x90 cm vs 30x36 in
- Disposable Underpad Sizing: Choosing Right Dimensions for LTC
- Case Review: A Manitoba Care Home Cut Incontinence Brief Waste With Sizing Charts
Frequently Asked Questions
Is 60 x 90 cm the same as 30 x 36 in?
No. 60 x 90 cm is about 24 x 35 in, so the metric pad is narrower than the 30 x 36 in pad. Substituting one for the other changes both coverage and consumption per resident day.
Should a pad go under a brief as well as under the resident?
Under the resident, not under the brief. Layering a pad beneath a brief creates an unstable surface and can interfere with the brief's leg cuffs.
How many pads per resident day should a home plan for?
Plan from the change routine, not from the pad size. Count changes per day per care level, then add the replace-on-soil events, and order against that figure.
Do pads need a different specification for overnight use?
Yes, where the interval is longer. Overnight use calls for a pad with more absorbency rather than a larger pad, because the constraint is fluid load rather than area.
CliniEco Medical is a licensed medical device establishment (MDEL #35334).
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