The Secret to Plump Cushions: A Quick Sizing Guider
Ever wonder why your cushions look sad and saggy instead of plush and professional? You’re not alone. Luckily, the fix is incredibly simple.
The number one secret to a perfect cushion is this: Your cushion insert should always be slightly larger than your cushion cover.
This simple trick ensures your cover is filled out completely, creating sharp corners and a full, luxurious look. This guide gives you the exact measurements you need.
Your Sizing Cheat Sheet
The amount of "oversize" you need depends on the cushion's shape and size. Here are the go-to rules for getting it right every time.
| Cushion Type | Recommended Insert Oversize |
|---|---|
| Standard Square Cushions (e.g., 18x18 in) | 2 inches (5 cm) larger than the cover |
| Rectangular/Lumbar Cushions (e.g., 12x20 in) | 1–2 inches (3–5 cm) larger than the cover |
| Extra-Large Squares (≥ 24x24 in) | Up to 3 inches (7.5 cm) larger than the cover |
| Very Small Squares (< 18x18 in) | 1 inch (2.5 cm) larger than the cover |
In short: For a standard 20x20 inch cover, you should use a 22x22 inch insert. It's that easy.
A Quick Note on Fill Material
These sizing rules work perfectly for common fills like down, feather, and polyester/down alternative.
However, foam inserts are different. For a foam cushion (like a bench or window seat), you want a snug fit. The cover should be the exact same size as the foam, or even a half-inch smaller, to create a taut, smooth surface.
Go Forth and Banish Saggy Cushions!
That's all there is to it. By following this simple "bigger insert" rule, you can get a professional, high-end look for all your custom cushions. Now you have the knowledge to order or create your next set of cushion covers with confidence.