cushion sizes
Standard Outdoor Cushion Sizes: Chart for Chairs, Sofas, Chaises, Benches and Swings
A quick reference chart of standard outdoor cushion sizes and thicknesses for dining chairs, lounge chairs, deep seats, chaises, benches, swings and throw pillows, plus how to measure your own.
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Updated October 2026 · By Sam K, Fabrica Kraft
Quick summary
A standard outdoor dining chair cushion is about 18″ × 18″ to 20″ × 20″ and 2″ to 3″ thick. Lounge and club chair seats run about 21″ to 24″ square, 3″ to 4″ thick; deep-seat sofa cushions about 24″ to 30″ square, 5″ to 6″ thick; and chaise lounge cushions about 72″ to 80″ long by 22″ to 26″ wide. These are typical ranges, not rules: brands vary, so always measure your own frame.
Standard outdoor cushion size chart
| Cushion | Typical width × depth (or length) | Typical thickness |
|---|---|---|
| Outdoor dining chair seat | 18″ × 18″ to 20″ × 20″ | 2″–3″ |
| Bistro chair seat (often round) | 15″–17″ across | 1.5″–2″ |
| Club or lounge chair seat | 21″ × 21″ to 24″ × 24″ | 3″–4″ |
| Deep seat chair or sofa seat | 24″ × 24″ to 30″ × 30″ | 5″–6″ |
| Deep seat back cushion | 24″ × 18″ to 30″ × 24″ | 4″–6″ |
| Adirondack chair (seat and back) | About 20″ wide; 40″–45″ total length | 2″–3″ |
| Chaise lounge (one piece or hinged) | 72″–80″ × 22″–26″ | 3″–4″ |
| Garden bench, 2-seater | About 45″–48″ × 16″–18″ | 2″–3″ |
| Garden bench, 3-seater | About 57″–60″ × 16″–18″ | 2″–3″ |
| Porch swing, 4-foot / 5-foot | About 46″ / 58″ × 18″–22″ | 3″–4″ |
| Daybed or swing bed mattress | Twin about 39″ × 75″ | 4″–6″ |
| Square throw pillow | 16″, 18″, 20″, 22″ or 24″ | , |
| Lumbar pillow | 12″ × 20″, 14″ × 24″ or 14″ × 36″ | , |
For indoor sizes and European and UK equivalents, see standard cushion sizes in the US, UK and Europe. For deep seating in more detail, read the deep seat size difference.
How thick should an outdoor cushion be?
- 2″–3″: dining chairs and benches, so you stay at table height.
- 3″–4″: lounge chairs, chaises and swings.
- 5″–6″: deep seating sofas and sectionals.
We cut foam up to 8″ in the builder; thicker sizes are quoted by email.
How to measure for a perfect fit
- Measure the frame or seat, not the old cushion, which shrinks and flattens with use.
- Measure width side to side and depth front to back, at the front and back, and use the smaller number.
- Round to the nearest ¼″ and note any tapering, rounded corners or notches for posts.
- For hinged chaise cushions, measure the seat and back sections separately.
Our measuring guide covers every shape with diagrams, and the cushion size and foam guide suggests a thickness and foam for your furniture.
Why standard sizes often don't fit
Off-the-shelf outdoor cushions come in a handful of sizes, but frames vary by brand, year and style. A cushion an inch too small slides around and gaps at the arms; an inch too big bulges and wears at the edges. Made-to-measure cushions avoid both. We cut every cushion within ±0.5″ of the size you order.
FAQ
What is the standard size of an outdoor chair cushion?
Most outdoor dining chair cushions are 18″ × 18″ to 20″ × 20″ and 2″ to 3″ thick. Lounge chair seats are larger, about 21″ to 24″ square and 3″ to 4″ thick.
What size is a standard chaise lounge cushion?
Usually 72″ to 80″ long, 22″ to 26″ wide and 3″ to 4″ thick.
What size are deep seat cushions?
Deep seat cushions are typically 24″ to 30″ deep and 5″ to 6″ thick, compared with about 20″ deep for standard seating.
Should a cushion be smaller than the chair frame?
Slightly. If it sits inside arms or a rim, take about ¼″ off each dimension so it drops in without bowing.
Find your size in the builder: outdoor chair cushions, chaise cushions, bench cushions, porch swing cushions and deep seat cushions.
