20x20 Outdoor Cushions

A 20″ × 20″ seat cushion fits many patio dining armchairs, wider bistro chairs and the seats of lighter lounge chairs. It is one of the most searched outdoor seat sizes, but chairs sold as “20 inch” often measure 19″ or 20.5″ across. We cut every cushion to order, so it fits the seat you actually have.

Build a 20″ × 20″ cushion Cover only

Cut within ±0.5″Free shippingShips in 2–3 weeksLifetime price match

At a glance

20″ × 20″ outdoor seat cushions

Usually fitsDining armchairs

Patio dining armchairs, wide bistro chairs and light lounge chairs.

Thickness2″–4″

2″ to 3″ for dining chairs, 4″ for lounge seats. Cut up to 8″.

AttachTies

Matching-fabric ties at the back corners are standard. Velcro on request.

Measure

Check your size

Measure the seat at its widest point side to side, then front to back.

If the back of the seat is narrower than the front, note both widths; we can cut a tapered (trapezoid) cushion.

Note where the chair uprights are so ties sit in the right place. See the measuring guide.

How it works

Order in three steps

Open the builder. Your 20″ × 20″ size and a 3″ thickness are filled in; change anything you need.

Choose Sunbrella fabric, foam and ties. Not sure on colour? Order a swatch.

We cut within ±0.5″ and ship in 2–3 weeks, with free shipping.

Other sizes

Shop by size

16″ × 16″17″ × 17″17″ × 18″18″ × 18″18″ × 20″19″ × 19″20″ × 20″20″ × 24″21″ × 21″22″ × 22″22″ × 24″24″ × 24″25″ × 25″26″ × 26″27″ × 27″28″ × 28″14″ × 36″ lumbar All sizes

FAQ

Questions

Is 20x20 a standard outdoor seat cushion size?

It is common for patio armchairs, but sizes vary by brand. Measure your seat and enter the exact size, in ¼″ steps.

My seat is wider at the front. Can you match it?

Yes. Order a trapezoid cushion with the front and back widths.

Can I get just a 20x20 cover?

Yes. Order cover only to fit foam you already have.

Can I order a set?

Yes. Order one cushion or a full set of 2, 4, 6 or more; there is no minimum order.