Key takeaways
- Seat depth: from the front edge of the seat to where the backrest meets the seat. This is where the cushion’s hinge should land.
- Back height: from the seat-back junction to the top of the backrest. For high-back cushions, stop 1–2 inches below the top rail so ties can wrap it.
- Seat width: at the widest usable point between arms (if any). Aim for a cushion 0.5–1 inch narrower so it does not bulge against the arms.
- Tie points: note where you can tie: slats, rails or spindles. Cushions with ties at the hinge and top keep in place far better than seat-only ties.
To choose garden chair cushions with backs, measure your chair from the front edge of the seat to the top of the backrest and match that length to a high-back (about 44–48 inches), mid-back (about 36–42 inches) or low-back (about 30–35 inches) cushion, then check that the hinge line where seat meets back lands where your chair actually bends. Get that one measurement and the hinge position right and almost any cushion will sit flat; get it wrong and the cushion slides, bunches or hangs over the top of the chair.
Step 1: Identify Your Chair Type
“With backs” covers three distinct shapes, and they are not interchangeable. Match your chair to one of these before measuring:
| Cushion style | Total length | Typical width | Seat section depth | Fits |
|---|---|---|---|---|
| High back | 44–48 in | 20–22 in | 18–21 in | Stacking resin chairs, folding wooden recliners, tall rattan dining chairs |
| Mid back | 36–42 in | 19–21 in | 17–20 in | Standard metal and wooden dining chairs, many rattan chairs |
| Low back | 30–35 in | 19–21 in | 16–19 in | Bistro chairs, short-backed wrought iron chairs |
| Separate seat + back (deep seating) | Seat 22–25 in deep, back 18–24 in tall | 21–25 in | 22–25 in | Lounge and club chairs, deep wicker sets |
| Rounded back | Varies | Back panel 18–22 in, curved top | 17–20 in | Tub chairs, curved-back rattan and wrought iron |
The widths and depths above are typical retail sizes, but chair manufacturers vary. Treat them as a starting point, not a substitute for a tape measure.
Step 2: Measure the Chair, Not an Old Cushion
Old cushions stretch and compress, so measure the chair frame itself.
- Seat depth: from the front edge of the seat to where the backrest meets the seat. This is where the cushion’s hinge should land.
- Back height: from the seat-back junction to the top of the backrest. For high-back cushions, stop 1–2 inches below the top rail so ties can wrap it.
- Seat width: at the widest usable point between arms (if any). Aim for a cushion 0.5–1 inch narrower so it does not bulge against the arms.
- Tie points: note where you can tie: slats, rails or spindles. Cushions with ties at the hinge and top keep in place far better than seat-only ties.
Worked example: a wooden folding chair with an 18-inch seat depth and a 26-inch back measures 44 inches in total. A 44-inch high-back cushion with a hinge at 18–19 inches fits; a 46-inch cushion with a 21-inch seat section will overhang the front edge by 3 inches and slide forward.
Step 3: Choose the Hinge and Tufting
The hinge is the stitched line that lets the cushion fold between seat and back. Some cushions have one hinge; high-back cushions often have a second hinge near the headrest. Tufting (buttons or stitched points) holds filling in place but creates dips that collect water.
- Single hinge: best for upright dining chairs.
- Double hinge: better for reclining chairs where the back angle changes.
- Knife-edge vs box-edge: knife-edge (seams meet at a point) is thinner and suits slim chairs; box-edge (with a side panel) holds shape and works better on wide rattan chairs.
Step 4: Pick Fill and Fabric for Your Climate
| Fill | Typical thickness | Comfort | Drying | Expected life outdoors |
|---|---|---|---|---|
| Polyester fiberfill | 2–4 in | Soft at first, flattens | Slow, holds water | 1–2 seasons |
| Polyurethane foam wrapped in fiber | 3–5 in | Firm, supportive | Slow unless reticulated | 3–5 seasons if kept dry |
| Reticulated (quick-dry) foam | 3–5 in | Firm, slightly springy | Fast, drains through | 4–7 seasons |
| Polyester cluster fill | 3–5 in | Plush, re-fluffable | Moderate | 2–3 seasons |
For fabric, solution-dyed acrylic holds color longest in strong sun because the pigment runs through the fiber rather than sitting on the surface. Spun or olefin fabrics sit in the middle, and printed polyester is the most affordable but fades fastest. If cushions stay out year-round, prioritize quick-dry foam plus solution-dyed acrylic. If they live in a deck box between uses, fiberfill and polyester are acceptable trade-offs.
Matching Cushions to Specific Chairs
High back resin and lawn chairs
Classic stacking resin chairs and folding lawn chairs almost always take a high-back cushion around 44–46 inches long. Because the plastic is slick, choose cushions with non-slip backing or ties at both the hinge and headrest.
Wooden garden chairs
Wooden slatted chairs benefit from thicker cushions (3–4 inches), since slats press through thin pads. Tie the cushion to a slat rather than around the whole backrest so it does not slip down over time.
High back rattan chairs
Rattan and wicker high-back chairs often have rounded tops and wider seats. Look for cushions with a contoured or rounded back panel and a box-edge seat. Measure the seat at its widest point, since rattan seats often taper from front to back.
Rounded and round cushions
Round seat pads (usually 15–18 inches in diameter) suit bistro chairs and stools but do not include a back. For tub chairs, buy a set with a curved back panel or a separate wraparound back cushion.
Which Cushion Suits Which Situation
| Your situation | Choose |
|---|---|
| Rainy climate, cushions stay outside | Quick-dry foam, solution-dyed acrylic, knife-edge, ties at two points |
| Long dinners in dining chairs | Mid-back, 3–4 in foam seat, single hinge |
| Relaxing in reclining chairs | High-back with double hinge and headrest section |
| Budget, stored indoors between uses | Fiberfill with polyester cover |
| Kids and pets | Removable zippered covers that can be washed |
Care That Makes Cushions Last
- Stand cushions on edge after rain so water drains out of the bottom seam.
- Brush off pollen and leaves weekly; organic debris feeds mildew.
- Clean with mild soap and water; for mildew on solution-dyed acrylic, follow the fabric maker’s diluted-bleach guidance.
- Store dry in a ventilated deck box or garage over winter, never sealed damp in plastic bags.
What They Cost
Expect roughly $20–$40 per cushion for fiberfill with polyester covers, $40–$90 for foam cores with olefin or spun polyester, and $80–$180 or more per cushion for solution-dyed acrylic over quick-dry foam. Custom-sized high-back cushions sit at the top of that range but solve fit problems on unusual chairs.
