Key takeaways
- Fit is everything here, so replacement pillows for outdoor furniture, meaning the seat and back cushions rather than decorative throws, are chosen by measuring the furniture itself, not the old cushion. The four options below are compared on how you…
Fit is everything here, so replacement pillows for outdoor furniture, meaning the seat and back cushions rather than decorative throws, are chosen by measuring the furniture itself, not the old cushion. The four options below are compared on how you confirm the fit, from custom sets to model-specific cushions.
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By KK Home Furnishings Editorial Team
How to Choose Replacement Pillows for Outdoor Furniture
Choosing replacement pillows for outdoor furniture works best when you measure the furniture rather than the worn cushion, separate seat depth from back height, subtract the seat thickness from the back-cushion height, and confirm model-specific fit before ordering. Those four steps keep the replacements sized to the furniture rather than to a guess.
Measure The Furniture, Not The Old Cushion
The furniture itself is the reference, not the old cushion, which may have flattened or stretched. Cushion Source, which makes custom sets, specifically asks customers to measure the furniture and to round measurements to the nearest quarter inch, because a worn cushion no longer reflects the true opening it is meant to fill.
Match your measuring to the frame: record the seat opening, the back height and the total width directly from the furniture, since an old cushion that has compressed will give a smaller figure than the frame actually needs. Taking the numbers from the furniture is what produces a replacement that fills the space correctly.
The reason this matters is that cushions deform over seasons of sun and use, so copying the old one repeats any shrinkage. Measure the frame carefully, round to a quarter inch as makers advise, and you avoid ordering a replacement that is already too small because it was sized to a tired, deflated cushion rather than the furniture.
Separate Seat Depth From Back Height
Seat and back cushions are different measurements, so record them separately rather than as one figure. The POLYWOOD XUF0015 set, for example, lists a seat of 23 by 24 by 7.75 inches and a back of 22.5 by 21 by 6 inches, two distinct sizes that each have to match their part of the furniture.
Match each cushion to its own opening: the seat depth is measured front to back on the seat, while the back height is measured up the backrest, and confusing the two produces a cushion that fits one part and not the other. Keeping them separate is essential when a set includes both a seat and a back.
The practical point is that a seat cushion and a back cushion serve different roles and sit in different planes, so their measurements do not interchange. Record the seat width and depth and the back width and height as separate numbers, and match each to the furniture, since a set is only right when both parts fit.
Subtract Seat Thickness From Back-Cushion Height
The back-cushion height depends on the seat cushion beneath it, so account for the seat thickness. A common method, used by custom makers like Cushion Source, is to take the furniture back height and subtract the seat-cushion thickness to find the back-cushion height, since the seat raises where the back begins.
Match the calculation to your real numbers rather than an example: if the furniture back measures a certain height and the seat cushion is a few inches thick, the back cushion is sized to the difference. Using the actual figures for your furniture, not a generic example, is what makes the back cushion sit at the right height.
The reason to subtract is that the seat cushion lifts the sitter, so a back cushion sized to the full frame height would sit too high. Factor in the seat thickness, and also allow for welting, which custom makers note can add up to about half an inch, so in a confined space subtract that allowance before ordering.
Check Model-Specific Fit Before Ordering
Many replacement cushions are made for specific furniture, so confirm the compatibility before buying. The POLYWOOD XUF0015 set is listed by the maker for a defined list of POLYWOOD styles rather than for patio chairs in general, so it fits those models and is not a universal cushion for any seat.
Match the cushion to your exact furniture: the Pottery Barn Westport cushions are made for the Westport Collection, so they suit that sofa and not another, and a custom maker sizes to your measurements. Reading the stated compatibility avoids ordering a cushion that is close but not right for your particular frame.
The reason model-specific fit matters is that outdoor furniture varies widely in opening sizes, so a cushion built for one line rarely fits another cleanly. Confirm the replacement is made for your furniture or made to your measurements, rather than assuming a listed cushion will fit most chairs, since a near-miss sits poorly and wears unevenly.
Top Picks
These four options cover a custom set for hard-to-fit furniture, cushions in standard chair sizes, a model-specific POLYWOOD set and an exact Westport Sofa replacement, verified as of October 2026. No single option is named best value, because each sells a different number and type of cushion, so their prices do not compare one to one.
| Product | Best For | Key Spec | Watch Out For |
|---|---|---|---|
| Cushion Source Custom | Best Overall (Hard-To-Fit) | Made to your measurements; 4-8 in thick; from ~$238.11 | Measure carefully; made to order |
| Frontgate Double-Piped Cushion | Standard Chair Sizes | 17×17 to 23.5×19 in; 3 in thick; ~$151.20 | Single chair cushion |
| POLYWOOD XUF0015 | Verified POLYWOOD Fit | Seat 23x24x7.75 in; back 22.5x21x6 in; ~$319 | Fits only listed POLYWOOD styles |
| Pottery Barn Westport | Exact Westport Sofa Fit | 2 seat + 2 back cushions; ~$609 | Westport Collection only |
Cushion Source Custom Deep Seating Set – Best Overall For Hard-To-Fit Furniture
The Cushion Source custom set is the pick for furniture that nothing off the shelf fits, made to your own measurements with a deep-seating thickness range of 4 to 8 inches, starting around $238.11 for a selected configuration as of October 2026. Because it is built to your numbers, it suits unusual or older frames.
The custom approach is its strength: you measure the furniture, round to a quarter inch, and the cushions are made to match, which solves fit problems that standard sizes cannot. For a one-off or discontinued piece, a made-to-measure set is often the only way to get replacements that truly fit the frame.
The caveats are that the starting price changes with the options you choose and it is made to order, so plan ahead and measure precisely. Measure the furniture rather than the old cushion, allow for welting, which can add up to about half an inch, and subtract that in a confined fit before placing the order.
Frontgate Double-Piped Cushion – Best For Standard Chair Sizes
The Frontgate double-piped chair cushion is the pick for a standard seat, offered in sizes of 17 by 17, 19 by 18, 21 by 19 and 23.5 by 19 inches, all 3 inches thick, listed at about $151.20 from a $189 regular as of October 2026. The range of stock sizes suits many common outdoor patio chairs.
Having several standard sizes makes it easy to match a typical chair without custom ordering, and the double-piped finish gives a tailored look. For a chair whose seat falls near one of these sizes, it is a quicker, lower-cost route than a made-to-measure set, so measure your seat and pick the closest listed size.
The caveats are that it is a single chair cushion rather than a seat-and-back set, and it ships later in October, so confirm timing. Measure the chair seat and choose the nearest size, since a cushion a little too large or small sits poorly, and treat the stock sizes as the limit rather than a custom fit.
POLYWOOD XUF0015 – Best For Verified POLYWOOD Compatibility
The POLYWOOD XUF0015 set is the pick for specific POLYWOOD furniture, a seat of 23 by 24 by 7.75 inches and a back of 22.5 by 21 by 6 inches, listed at about $319 in standard fabric colors as of October 2026. It is made for a defined list of POLYWOOD styles rather than for patio chairs in general.
The verified compatibility is its value: for the POLYWOOD models it is listed to fit, it takes the guesswork out, matching the exact seat and back openings. For an owner of one of those chairs, a cushion designed for the frame fits far better than a standard size chosen by eye, and lasts longer by sitting correctly.
The caveat is scope: it fits only the POLYWOOD styles the maker lists, so it is not a universal cushion and should not be bought for a different chair. Confirm your furniture is on the compatible list before ordering, since a cushion built for one frame will not sit right on another even of similar size.
Pottery Barn Westport – Best For Exact Westport Sofa Replacement
The Pottery Barn Westport replacement is the pick for that specific sofa, a set of two seat cushions at 38.5 by 26 by 4 inches and two back cushions at 38.5 by 17 by 6 inches, listed at about $609 for inserts and covers as of October 2026. It is made to fit the Westport Collection exactly.
The exact-fit design is its strength: for a Westport sofa, the cushions match the frame openings precisely, restoring the sofa without the guesswork of generic sizes. For an owner replacing worn cushions on that collection, a set built for it is the cleanest route to a like-new result that sits and looks correct.
The caveats are that it suits the Westport Collection only and is the most expensive option here, covering a full sofa’s worth of cushions. Confirm your sofa is a Westport before ordering, since the cushions are sized to that frame, and note the price reflects two seat and two back cushions rather than a single piece.
Frequently Asked Questions
Owners replacing outdoor cushions tend to ask the same practical questions, and most come back to measuring and fit rather than style. These answers keep the guidance tied to the options above while being clear that the furniture, not the old cushion, is the reference and that fit beats a universal claim.
How Do I Measure Outdoor Furniture For Replacement Cushions?
Measure the furniture itself, recording the seat width and depth, the back height and the total width directly from the frame. Custom makers like Cushion Source ask you to round measurements to the nearest quarter inch, so take careful figures from the furniture rather than estimating, since small errors show in a poor fit.
The reason to measure the frame is that a worn cushion may have shrunk or stretched, so it no longer matches the opening it fills. Measuring the furniture gives the true size, and accounting for welting, which can add up to about half an inch, helps the new cushion sit correctly rather than bulging or sagging.
Separate the seat and back figures, and for the back height subtract the seat-cushion thickness, since the seat lifts where the back begins. Round to a quarter inch, allow for welting in a tight fit, and the measurements will produce a replacement sized to the furniture rather than to a tired old cushion.
Should I Measure My Old Patio Cushions?
No, measure the furniture instead, because an old cushion is an unreliable guide. Over seasons of sun and use, cushions compress and distort, so their dimensions no longer match the frame opening, which is why makers ask you to measure the furniture and round to a quarter inch rather than copying the worn piece.
The reason the old cushion misleads is that it has already shrunk or spread, so sizing a replacement to it repeats the problem and produces a cushion that is too small or the wrong shape. The furniture opening, by contrast, has not changed, so it gives the true dimensions the new cushion needs to fill.
Take the seat and back measurements from the frame, keeping them separate, and subtract the seat thickness when sizing the back height. Allow for welting in a confined fit, and the result will match the furniture, which the old cushion cannot guarantee once it has flattened over time in the weather.
How Thick Should Outdoor Seat Cushions Be?
It depends on the furniture and comfort you want, with these options spanning 3 inches on the Frontgate cushion to a 4-to-8-inch range on the custom set. A deeper cushion suits deep-seating furniture and softer lounging, while a thinner one suits dining chairs, so match the thickness to the frame it sits in.
The reason thickness varies is the furniture type: deep-seating patio sofas are designed for thick cushions, while a chair seat needs less. A cushion too thick for a dining-height chair raises the sitter awkwardly, while one too thin for deep seating feels hard, so the frame’s design guides the right depth.
Match the thickness to the seating style and account for how it changes the sitting height, especially on a chair. For deep-seating furniture a thicker cushion in the 4-to-8-inch range suits, while standard chairs do well around 3 inches, so let the furniture rather than a single ideal figure decide the depth.
Can I Use A Universal Cushion On Brand-Specific Patio Furniture?
It rarely fits well, since brand-specific furniture has its own opening sizes. The POLYWOOD XUF0015 set, for instance, is made for a defined list of POLYWOOD styles rather than for chairs in general, so a universal cushion chosen by eye is likely to sit poorly on a frame it was not designed for.
The reason is that outdoor frames vary in seat and back dimensions, so a generic cushion is a compromise that often overhangs or falls short. A cushion made for your specific furniture, or made to your measurements, matches the openings and sits securely, which a one-size option cannot reliably do on a branded frame.
For the best result, use a cushion listed for your furniture or a custom set sized to your measurements rather than a universal one. If you must use a standard size, measure the frame and pick the closest match, accepting that a cushion built for the furniture will always fit and wear better than a generic one.
Final Thoughts
The best replacement pillows for outdoor furniture are sized to the furniture, not the worn cushion: the Cushion Source custom set for hard-to-fit pieces, the Frontgate cushion for standard sizes, the POLYWOOD XUF0015 for its listed styles, or the Pottery Barn Westport set for that sofa, with the furniture measured first.
