18" x 20" Patio Cushions
Your measurements become the cut: width, depth, and thickness, all yours to set. Factory-direct, single pieces welcome.
See the full cushion size chart — every standard size and its typical frames at a glance.
Start with your shape
Not sure? Pick the closest — every measurement is confirmed before we cut.
Don't see your shape? We make any shape.
Straight edges? A top photo + the edge numbers is all we need. Curved? Trace it on paper next to a tape measure and email us a photo.
Enter your measurements
Measure the old cushion flat, edge to edge — never the frame.
Choose your fabric
Five families, 119 cuts, one flat rate — pick by look and feel. Click a family to see its swatches below, or its ⓘ for what the fabric is and where it works best.
All covers cut to your exact dimensions — no stock sizes, zippered covers that remove for washing.
Review & order
Calculated live from your measurements — every line, no surprises.
Free shipping over $158 · $29 flat below
Estimates only — we re-verify every dimension before cutting and will contact you if anything looks off. Prefer email? Email me this quote
Odd shape or tricky frame? Upload a photo of your furniture or old cushion — one overall shot, plus a top and side view of the old cushion if you can.
JPG, PNG or WebP · up to 10 MB each · max 3
We make what we sell — nothing brokered
Scroll all 119 in the configurator first
Your dimensions, cut as entered
Outside the tolerance, it is remade on us
Build Your 18 x 20 Cushion
The 18 x 20 rectangle is the slightly-deeper cousin of the dining square — common on patio dining chairs with roomier seat decks, compact lounge chairs, and older deep-seat frames built before the 24-inch module standardized. It’s a size stock programs skip, which is why so many people land here after two failed returns. Square decks have their own ladder — the 23 x 23 lounge square up to the 30 x 30 daybed deck.
We cut every 18 x 20 patio cushion to the measurements you send — width, depth, thickness — sewn to the quarter inch. Dining-height chairs typically take 3″–3.5″; a 4″ pad turns a firm seat into all-evening seating. Fabric families run Cotton Linen for covered porches and indoors, Tech Fabric, the waterproof, wipe-clean leather-like workhorse, for full exposure, and Premium Velvet, plush claw-resistant velvet for indoor luxury.
Close but not exactly 18 x 20? Type your numbers — decimals included — and the estimate updates as you go →
Pricing — estimated starting at
*One cushion, 18 × 20 in. (2.50 sq ft top surface): $45 make-base + 2.50 sq ft × combined foam + fabric rate ($26.47/sq ft in 35D, $27.37 in 50D, $28.69 in 65D, each at the 3-inch default). No fabric carries a premium — the same price attaches to all 119. Entry pricing at 91 pairs the 2-inch cut with 35D foam. Checkout is where thickness is confirmed, and no cut starts until you have signed off on every dimension.
Benchmark: 2026 listings from U.S. custom-configurator specialists put made-to-order cushions in standard sizes (16×16–24×24) at about $71–$119 before shipping — with most of those prices surfacing only after a quote request. Nothing is padded here: every part of the estimate corresponds to a dimension you can check on the spot.
Fits these furniture series
Between sizes? Send the measured numbers — 18.5 x 20.25 costs the same formula price as any rectangle its area.
A different number on your tape? That is the one we cut to.
Measure your 18 x 20 seat
- Flatten the old cushion out and read three numbers: edge-to-edge width, front-to-back depth, seam-to-seam thickness — zero pressure on the foam.
- 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.
Photo-by-photo, the entire process: How to Measure (and Identify) Your Cushions.
Fabric choices at 18 x 20
Patio duty at this size is usually full-sun duty. Tech Fabric is the default: waterproof, wipe-clean, and unbothered by the sunscreen-and-ketchup economy of a dining table. Cotton Linen fits covered porches and shade structures; Premium Velvet belongs to screened rooms and indoor nooks rather than open weather. The climate-by-climate logic — UV versus trapped moisture versus abrasion — is laid out in the outdoor fabric guide.
A sample of the 119-fabric range — every option is open in the configurator before you order.
One chair, one pad
Thickness & Foam for a 18 x 20
An 18 x 20 patio pad is dining-chair geometry: 20 inches of depth gives the thigh room a lounge chair does not, and the thickness question is whether your table still clears knees afterward. Three inches is the spec most frames were built around; 3.5 buys plushness without lifting the sitter out of conversation height; 4 belongs to low frames and slow dinners. If the original pad’s thickness is known, match it — the table height was designed for it.
Density follows duty. A dining set used every evening wants 50D; a weekend balcony set can honestly run 35D; the 60–65D grades are real but rarely earn their cost at dining scale. All four grades cut to this footprint, and the grade is confirmed in writing with your dimensions before production.
This rectangle’s commonest order is a single seat — not a set. The bistro pair on a small balcony where one pad died. The lone patio armchair that came with the apartment. The replacement for a set of four where three pads survived and the fourth did not, and the owner would rather match one pad than replace four good ones. Single-piece orders are the honest use case at this size, and the no-minimums policy is what makes them ordinary: one pad, cut to one seat’s numbers, priced on its own area.
The one-patience note on singles: a new pad sits prouder than its settled neighbors — full loft versus compressed years — and fabric ordered later will not match the first dye lot. If the pad you are replacing had siblings ordered together, replacing in symmetry pairs (or as a set) buys matching; if it genuinely travels alone, none of that matters and the single is the right order.
18 x 20 or 20 x 18?
Dimension order is a convention, and the convention here is width first, depth second — but search boxes and furniture tags do not always honor it. The practical decode: the smaller number is almost always the width (side to side, between the arms), the larger the depth (front to back, the direction your thigh runs). A pad listed 18 × 20 and one listed 20 × 18 are usually the same rectangle — but only usually, because dining-chair decks sometimes run wider than deep.
The check that settles it in ten seconds: sit in the chair. The dimension running the same direction as your thigh is the depth; the one crossing the seat between the arms is the width. Enter them in either order on the form — the confirmation before cutting lists both numbers against both axes, and a swap caught there costs nothing.
Some of the 119 fabrics on offer — the configurator shows each one close up before you commit.
Frequently asked questions
Built where it is shipped from
- We have run this outdoor cushion workshop for over a decade; every order is cut, filled, and sewn by us.
- No yard of fabric is cut until your dimensions have been checked again.
- Order-by-order production: choose any fabric and any piece, even a single one.
- A miss on our side — beyond ±½″ (±¾″ past 36″), wrong fabric, wrong build — and the remake is on us.
Custom 18 x 20 cushions from $106 — the quote takes four steps.
Ready when you are. Enter your measurements, pick your fabric and your finishing — every dimension comes back to you for confirmation before we cut. One cushion or a whole set, from the factory that ships them. Cut to within ½ inch of your confirmed numbers — outside tolerance, remade free.
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