17" x 18" Outdoor Cushions – Custom Made to Your Exact Size
Cut to your measurements — width, depth, and thickness — not to a stock chart. Factory-direct, no minimums.
Seventeen by eighteen is a true odd-size — the footprint of smaller dining chairs, balcony sets, and children’s outdoor seating that no stock program bothers to carry. Odd sizes are where custom cutting earns its keep: your frame exists, it measures what it measures, and we cut to that number instead of the nearest bin.
We cut every 17 x 18 outdoor cushion to the measurements you send — width, depth, thickness — sewn to the quarter inch. Thickness for small dining frames runs 2.5″–3″; a 4″ pad can lift a small chair awkwardly high. Fabric tiers run Tech Fabric, our waterproof, wipe-clean leather-like weave — the outdoor workhorse; Cotton Linen, a durable everyday weave for covered porches and indoors; and Premium Velvet, plush claw-resistant velvet for indoor luxury.
Pricing — estimated starting at
| Fabric tier | Estimated price* |
|---|---|
| Cotton Linen | $80 |
| Tech Fabric | $94 |
| Premium Velvet | $112 |
*One cushion, 17 × 18 in. (2.12 sq ft top surface): $39 make-base + 2.12 sq ft × fabric rate ($19.0/sq ft, $25.5/sq ft, $34.0/sq ft). Thickness, foam density, and the sewn closure is confirmed at checkout — and every dimension is confirmed with you before we cut.
For comparison: U.S. custom-configurator specialists’ 2026 listings for made-to-order cushions in common sizes (16×16 through 24×24) run roughly $71–$119 before shipping — and most only reveal that price after a quote request. We publish the formula above so you can check the math before you order.
Fits these furniture series
Factory-original cushions measured within 1¼″ of 17 × 18 — the library is thin at this exact footprint, which is itself useful information: a true 17 x 18 frame is usually a compact or regional line, and custom cutting is the normal route for it.
| Series | Piece | Part | Factory size (W × D × T) |
|---|---|---|---|
| Charlottetown (Martha Stewart) | Dining Chair | Seat | 18.25 × 18.25 × 3.75 in. |
Close but not exact? That is the everyday case at this size — send your measured numbers and we cut to them; nothing in this library gets rounded to fit a bin.
Measuring tips for a 17 x 18
- Old cushion flat on a table: width edge to edge, depth front to back, thickness seam to seam — never squeezed.
- No old cushion? Measure the seat deck between the frame rails and arms, and send the raw numbers rather than rounding.
- Photograph the label under the frame first — a model number can match you to a documented series chart in seconds.
Full walkthrough with photos: How to Measure (and Identify) Your Cushions.
More measuring help: How to measure radius corners · 9 cushion measurement mistakes that cause remakes
Foam thickness for a 17 x 18
Thickness on a 17 x 18 seat is a height decision before it is a comfort decision: the chairs that take this footprint — compact dining chairs, balcony folding sets, kids’ patio seating — were designed around a 2.5–3 inch pad, and every inch above that lifts the sitter toward the table edge. Order 2.5 inches where knee clearance is tight, 3 where the frame sits low or the family lingers at dinner. A 4 inch pad on a small frame reads as upholstery, not seating.
Density is the lifespan half of the same choice. We cut four grades, 35D through 65D: 35D is the honest spec for occasional patio dining, 50D is the daily-family standard that keeps its front edge for seasons, and 60–65D belongs to mattress and commercial duty rather than a chair this size. The foam tier is confirmed with your dimensions before anything is cut.
Fabrics that suit a 17 x 18
At 17 x 18, the fabric should follow where the chair lives rather than the price tag. Open patios and poolside: Tech Fabric, our waterproof, wipe-clean weave that takes a season of sun and spilled drinks. Covered porches and three-season rooms: Cotton Linen, the breathable everyday weave. Indoor breakfast nooks: Premium Velvet if the household includes cats. Every tier sews to the same measurements — the tier changes the price, never the fit — and the full tier-by-tier comparison lives in the outdoor fabric guide.
Axroma Canvas · Gray
Axroma Canvas · Gray
Axroma Canvas · Khaki
From the 119-fabric swatch library — free samples ship with every quote.
Frequently asked questions
Can I order just one odd-size cushion?
Yes — no minimums, ever. One cushion or a set of six, each cut to the same exact numbers.
Should I measure the frame or the old cushion?
The old cushion if you have it, flat and edge to edge. If not, measure the seat deck between the frame rails and send the raw numbers — don’t round.
Do odd sizes cost more?
No. Everything here is cut to order, so 17 x 18 costs the same formula price as any rectangle its size.
Can I order a set of 17 x 18 cushions in matching fabric?
Yes — order by quantity and every piece is cut from the same fabric run, so the dye lots match chair to chair. Sets are the normal case at this size, since compact dining frames rarely travel alone; head chairs that measure an inch wider get their own line item in the same order.
Is 17 x 18 too small for high-density foam?
No — density is a foam grade, not a minimum size. A 17 x 18 pad in 50D holds adult weight for years where a low-density pad dishes within a season; small seats simply need the height logic respected first (2.5–3 inches), then the density chosen for how often the chair is used.
Is 17 x 18 an unusual size to order?
Not here — odd rectangles are steady work at a custom shop, because the frames that take them were mass-produced even if their pads never were. Unusual would be expecting a bin to hold it: the retail system stocks the middle of the size spread, and 17 × 18 lives at the edge by design.
The honest case for odd sizes
Nobody chooses a 17 × 18 frame; the frame is inherited, gifted, or bought in a year when the factory felt like it. The size exists because furniture production never standardized — different factories, different countries, different decades, each cutting seats to the frames they happened to build — and the retail bin system that grew alongside it only ever stocked the middle of the resulting spread. Sizes like this one fell in the gap on purpose: too few owners per size to stock, too many owners in total to serve.
Made-to-order closes the gap by not trying to stock it. Your 17 × 18 is not an unusual order here — it is a Tuesday: the form takes the numbers, the formula prices the area, and the factory cuts to the entry. The only special thing about an odd size is that it cannot be approximated: a 17 × 18 deck given an 18 × 18 pad overhangs both rails, and given a 16 × 17 it gaps at every edge. Odd sizes are where measuring stops being advice and becomes the whole product.
Neighbors: 17 x 17 and 18 x 18
The even squares on either side are the stock world’s nearest offers, and both are wrong for this frame — that is the point. An 18 × 18 pad overhangs the depth rail by an inch; a 17 × 17 leaves an inch of gap at the front edge where debris collects and the pad shifts. The middle sizes exist because factories built them; they persist because furniture outlives its parts channel by decades. If your tape says 17.5 × 18 or 17 × 18.25, that is the order — same formula, same quarter-inch tolerance.
