Measure the usable seating surface between the arms, subtract about 1/2 inch for a tight fit, and match a standard 36 to 60 inch or custom 72 inch cushion to your bench.
A stretched cover that misses by half an inch will bunch at the seams, slide when someone sits down, and rub the arms until the fabric pills. Getting the right outdoor bench cushion size comes down to three numbers — width, depth, and thickness — pulled off the bench itself, never off the cushion you’re replacing.
Here’s the full measurement routine, the nominal sizes that fit common bench lengths, and the mistakes that send buyers back for a second order.
How Do You Measure a Bench for a Cushion?
Measure side to side across the seat for width, front to back for depth, and vertically for thickness clearance — all on the bare seating surface, not the frame.
Run a tape measure along the inside edges of the seat, arm to arm if the bench has arms. Then measure depth from the front lip of the seating surface back to where the seat meets the backrest. Cushion.com’s bench guide and the Lowe’s measuring guide both describe this same two-dimension approach.
Three details separate a good measurement from a return slip:
- Check for a taper. Measure the width at the front, middle, and back of the seat. If the numbers differ, size to the smallest one so the cushion doesn’t bind.
- Subtract for a snug seat. For a tight-fitting area, reduce the measured width by about 1/2 inch or more so the cushion doesn’t rub the arms or trim.
- Clear the hardware. On a storage or flip-top bench, the cushion thickness can’t exceed the gap under the open lid. Measure that clearance before you pick a thickness.
Now check the fit against a real size. Benches sold in the US cluster around 36, 42, 48, 60, and 72 inches, and cushion listings follow the same pattern.
| Bench Length | Typical Cushion Size | What to Check First |
|---|---|---|
| 36 inches | 36-inch cushion | Confirm the true seat width, then trim for fit |
| 42 inches | 42-inch cushion | A common stock length — measure depth too |
| 48 inches | 48-inch cushion | Widely stocked; check arm clearance |
| 60 inches | 60-inch cushion | The top end of everyday stock sizes |
| 72 inches | Custom or 72-inch cushion | Often a custom order — see sizing notes below |
What Size Cushion Fits a 36, 42, 48, 60, or 72 Inch Bench?
A bench with a true 36, 42, 48, or 60 inch seating surface generally takes a cushion of that same nominal length, while a 72 inch bench usually needs a custom order or a harder-to-find 72 inch cushion.
The matching rule holds when the measured seat is close to the nominal size. If your seat tapes out at 47 1/2 inches, a 48-inch cushion is the call; if it’s 42 inches on the nose, the 42-inch cushion fits. Standard stock sizes run up to about 60 inches, and industry guides describe bench and window-seat cushions reaching 72 inches — but that length sits outside the usual shelf range.
Depth and thickness matter just as much as length. One industry guide puts typical outdoor bench cushions at 18 to 20 inches deep and 3 to 5 inches thick, and outdoor cushions broadly run 2 to 6 inches. Buyers who start by sorting through tested outdoor bench cushion picks usually have a shorter list once they’ve locked in their three measurements.
The 72-inch bench is the one to slow down on. Outdoor bench cushions are commonly listed at 44 to 60 inches long, so a 72-inch cushion often means custom fabrication, a longer lead time, and a higher price. Measure twice before ordering that length.
What Are the Most Common Bench Cushion Measuring Mistakes?
The biggest mistake is measuring the old cushion instead of the bench — a worn, compressed cushion reads smaller than the seat it sat on. A Lowe’s measuring guide and Cushion.com’s instructions both start from the furniture, not the cushion.
Other slips that cost a return:
- Measuring the outside of the bench rather than the inner seating area.
- Forgetting arms, back panels, hinges, trim, or screw heads that eat into the space.
- Taking one measurement on a warped or tapered bench and calling it done.
- Choosing a thickness without checking the clearance under a lid or against a backrest.
For a tight fit, size slightly smaller than the exact opening. Extra cushion gets compressed, rubs the frame, and wears out faster than a cushion that sits just right.
One last caveat: measurement conventions differ by furniture type. A bench, chair, or chaise can each want a different reference point, so use a bench-specific guide and measure the bench in front of you.
Before you buy, run this final pass: measure width, depth, and thickness on the bare seat; subtract about 1/2 inch if the fit is tight; size to the smallest width reading on a tapered bench; and confirm a 72-inch bench needs a custom cushion before you expect one-day delivery.
FAQs
Should I size a bench cushion slightly smaller than the seat?
Yes, for a tight-fitting bench. Several sources advise reducing the measured width by about 1/2 inch so the cushion doesn’t compress and rub against the arms or trim. If the bench is especially snug or doubles as storage, subtract closer to 1/4 to 1/2 inch. A cushion that fights the frame wears faster than one with a little breathing room.
How do I measure a bench with arms?
Measure width between the inside faces of the arms, not the outer edges of the bench. Then measure depth from the front edge of the seat back to where it meets the backrest. If the backrest leans, note that too — it can affect how far back the cushion sits before it stops.
Are 72 inch bench cushions a standard size?
Not usually. Stock bench cushions tend to run up to about 60 inches, and one industry guide lists outdoor bench cushions at 44 to 60 inches long. A 72 inch cushion is often a custom order. Measure the actual seating surface first, because your bench’s usable width may be shorter than its listed length.
References & Sources
- Cushion.com. “Measuring for Bench Cushions.” Bench-specific measuring steps and tight-fit sizing guidance.
- Lowe’s. “Measuring Guide.” How to measure width and depth on seating furniture.
- Cushion.com. “Measuring Instructions.” General cushion measuring conventions for benches and chairs.
