---
title: "Rounded Corner Cushions and Oval Seats: How to Measure Them"
url: "https://cushionguide.com/guides/rounded-corner-cushion-measuring/"
section: "The Pattern Room"
author: "Rosa Delgado, The Porch Keeper of Savannah"
author_url: "https://cushionguide.com/masters/rosa/"
published: "2026-06-29"
updated: "2026-06-29"
keywords: "rounded corner cushion, oval seat cushion, wicker loveseat cushion replacement, round cushion custom size, clipped corner cushion"
---

# Measuring rounded corners, oval wicker seats and bistro benches

*Porch furniture was never built with a square corner in sight. Wicker loveseats, oval settees and bistro benches all round off, and a new cushion has to round off the same way, in the same place.*

> **The quick answer:** To measure a rounded corner cushion, write the full length and depth as if the corners were square, then measure how far from each corner point the curve begins along both edges. For oval or irregular seats, trace the seat on paper, write the widest width and depth on it and photograph it from above beside a tape measure. Round seats need a diameter and thickness.

![Slate blue outdoor seat and back cushions on a teak sofa with ivory pillows, travertine patio and clipped hedge](https://cushionguide.com/media/outdoor-cushions/slate-blue-teak-patio-sofa-cushions-pergola-1600.webp "Solid slate blue seat and back cushions on a teak frame, softened with ivory pillows and a vase of garden daisies.")

## The number nobody writes down

The number that decides a **rounded corner cushion** is the one most folks never send: how far from the corner the curve begins. Length and depth, everybody writes down. The curve, hardly anybody.

I grew up on a porch full of wicker, and not one of those loveseats had a square corner. Send a maker two numbers and you'll get a rectangle, and a rectangle on a round-cornered frame sticks its corners out like a hound's ears. Every wicker loveseat cushion replacement I've made started with that missing number.

This Pattern covers rounded corners, clipped corners, ovals and rounds, plus the paper trick that settles every argument. The wider family is under [patio and porch cushions](https://cushionguide.com/cushions/patio-and-porch-cushions/).

## Measuring a rounded corner, step by step

1. **Measure it as if it were square**: Take the full length and depth at the longest and widest points, as though each corner ran out to a sharp point. Measure to the nearest 1/8 in, twice.
2. **Find where each curve begins**: Tape along one edge from that imaginary corner point to where the curve starts, then along the other edge. Buyers have sent 2.5 in (6.5 cm) each way; one sent 8 in (20 cm).
3. **Read the pair of numbers**: Equal distances mean a true circular corner, and that distance is its radius. Unequal ones, say 2 in and 4 in, mean a stretched corner: write both and say which edge gets the long sweep.
4. **Note every corner separately**: Some seats round only the front corners, some only the back, like the sectional below. Measure all four.
5. **Trace the tricky ones**: For an oval seat cushion or a curve you can't pin down, lay wrapping paper on the seat, trace the edge and cut it out. Write the widest width and the depth on the [paper template](https://cushionguide.com/glossary/#paper-template).
6. **Photograph it top side up**: Lay it flat, [top side up](https://cushionguide.com/glossary/#top-side-up), tape in the shot, camera straight overhead. A flipped tracing comes out mirrored. No need to mail the paper.
7. **Draw it and send it**: Sketch the seat from above with every number on its edge and each curve's start and end marked. Upload it with a furniture photo on the custom-shape listing; the workshop redraws it and confirms before cutting. See [the custom shape drawing](https://cushionguide.com/guides/custom-shape-cushion-drawing/).
8. **Give round seats a diameter**: Order a round seat by diameter and thickness: 'round, 16 in diameter'. Measure across in two directions first; if they differ, it's an oval, so trace it.

## Rounded, clipped, oval or round: what to send

| Shape | Where you'll see it | What to measure | How to write it |
|---|---|---|---|
| Rounded corners | Wicker loveseats, patio sofa seats, sectional inserts | Size as if square, plus where each curve starts on both edges | 'Front corners rounded, curve starts 2.5 in along each edge' |
| Clipped corners | Window ledges, angled front corners | How far each cut runs in along both edges | 'Two front corners clipped 3 in each way' |
| Oval | Wicker settees, oval chair seats | A traced template with widest width and depth | Template photo from above, tape in shot |
| Round | Bistro stools, bar stools, play tents | Diameter and thickness | 'Round, 16 in diameter, 4 in thick' |
| One rounded end | Custom bistro and hall benches | Length, depth, where the curve starts and how deep it runs | A drawing of the curve; see [chord and rise](https://cushionguide.com/guides/curved-cushion-chord-rise-radius/) |

## Ten covers, two rounded corners and one good question

A buyer in the US wrote in about an outdoor sectional with benches. The inserts were fine; the covers were finished. They needed ten: seven at 25 x 15.5 x 4.25 in (63.5 x 39.5 x 11 cm), one at 47 x 15 x 5.5 in, and two at 76.5 x 30.5 x 5.5 in (194 x 77.5 x 14 cm) with rounded back corners, all piped and zipped, in a [UV-resistant outdoor fabric](https://cushionguide.com/fabrics/outdoor-acrylic/).

They'd measured the [boxed](https://cushionguide.com/glossary/#boxed-edge) side panel seam to seam, 5.5 in, and the workshop took that as given. Then it asked the question this Pattern is about: how far from each corner does the curve begin? The rounded corners were never the problem. The missing number was.

What I took home: measure a boxed panel seam to seam and let a full insert [crown](https://cushionguide.com/glossary/#crowning) the top; don't enlarge the panel. More in [covers for existing foam](https://cushionguide.com/guides/cushion-covers-for-existing-foam/).

## When a clipped corner is the easier answer

Not every corner needs a curve. A **clipped corner cushion** is cut straight across each corner and described with two plain numbers: how far the cut runs in along each edge. Three inches off both front corners; a back corner taken off for a window ledge. It's cut exactly to your drawing.

Clipped and rounded both go through the custom-shape listing, sized by the longest length and widest depth, with fabric and piping codes in the personalization notes.

And if the budget's tight, neighbor, there's the old porch answer: a plain rectangle is much cheaper than any shaped piece, and a throw pillow tucked into each corner fills the gap like it was planned.

## Where rounded-corner orders go sideways

- ✗ **Two numbers for a round cushion.** '16 x 16' reads as a square; write 'round, diameter 16 in'.
- ✗ **A gentle curve in numbers alone.** Subtle rounds get read as square. Draw every curve.
- ✗ **A style photo instead of a sketch.** The photo suggests a shape; the ordered size decides it.
- ✗ **A shaped seat on the rectangle listing.** The order is held, then refunded for reordering or sent a price-difference link.
- ✗ **No margin on a cover for a firm insert.** Handmade sizes vary by about 1/2 to 1 in and piping adds to the outside; say whether your sizes include it. See [size tolerance](https://cushionguide.com/guides/custom-cushion-size-tolerance/).

## Try the corner in the Studio first

Before you trace a thing, play with it. The [chair cushion builder](https://cushionguide.com/studio/chair-cushion-builder/) takes a corner radius, or a round seat, so you can watch a 2.5 in round-off appear on a seat pad in 3D, ties and piping included. For loveseat and bench seats, the [bench cushion builder](https://cushionguide.com/studio/bench-cushion-builder/) has a rounded front, measured the same way: from the corner to where the curve starts.

Then take the tape back out to the porch. The builder shows the idea; your furniture decides the numbers. So what does the curve on your wicker loveseat measure?

> **Tailor's margin:** For a rounded cushion corner, measure how far from the corner point the curve begins along both edges. Equal numbers mean a true radius.

> Round cushions are ordered by diameter and thickness. Write 'round, 16 in diameter, 4 in thick', because 16 x 16 in reads as a square.
>
> — Rosa Delgado

## Buyer questions: corners, ovals and rounds

**A common question:** Our long seat cushions have rounded corners. What should I measure so new ones match?

**The workshop's answer:** Measure each cushion as a full rectangle at its longest and widest points, then how far from each corner point the curve begins along both edges, for example 2.5 in each way. Add top-down photos with a tape along the edges, or trace the curve on paper.

**A common question:** Could you cut the corners off at an angle instead of rounding them?

**The workshop's answer:** Yes: 3 in off two corners, both front corners angled, or a back corner removed for a window ledge. Order on the custom-shape listing, sized by the widest depth and longest length, with a drawing showing how far each corner cuts in along both sides.

**A common question:** Do you make round seat cushions in custom sizes?

**The workshop's answer:** Yes, specified by diameter and thickness with a drawing or photo. Past rounds include 16 in (40.5 cm) café bar-stool cushions at 4 in thick for heavy commercial use and a 41 in (104 cm) round for a play tent. Stool frames and bases aren't made.

**A common question:** Why can't a rounded-corner cushion go through the cheaper rectangle listing?

**The workshop's answer:** Shaped cushions need extra cutting and sewing, so they're priced separately and made on their own production line. One ordered as a rectangle is refunded for reordering or sent a link for the difference. A rectangle with throw pillows in the gaps is the budget route.

## Rounded corner questions, answered short

### Is a corner radius the same as where the curve starts?

On a true circular corner, yes: a curve that begins 2.5 in (6.5 cm) from the corner point along both edges is a 2.5 in radius. If the two distances differ, it isn't a circle, so give both.

### Can an oval wicker cushion have piping?

Yes. Oval and rounded wicker seat cushions are quoted with piping, and matching square throw pillows can be priced alongside. The shape is checked and confirmed before you order.

### Can ties be added to a rounded seat cushion?

Yes. Fabric [ties](https://cushionguide.com/glossary/#ties) can be sewn into the seams at the corners or along the back, in any position. A photo and sketch of the seat let them land where the frame can take them.

### Should the cushion be smaller than a wicker frame with arms?

Treat the inside size as a hard maximum and ask for it sized under, not over. Plump cushions spread, so ordering the depth about 1 in under a fixed frame is a common fix.

## Related at the atelier

- [Round Outdoor Cushion on a Rooftop Plinth: Small Space, Big Seat](https://cushionguide.com/readings/round-saffron-outdoor-cushion-marrakech-rooftop/): A round outdoor cushion makes a small plinth or bench feel generous when it is cut to the seat's exact diameter, with the edge just inside the rim so an even ring of base shows.
- [Outdoor Bench Cushion Measuring: Coral, Slate and Gray Stack](https://cushionguide.com/readings/coral-slate-gray-outdoor-cushion-stack-lavender-2/): An outdoor bench cushion is measured as three numbers: length along the front, depth from front to back, and thickness, written separately for every piece.
- [Outdoor Bench Cushions for a Corner Patio: A Project Retold](https://cushionguide.com/readings/blue-corner-patio-sofa-cushions-hydrangea-flagstone/): For an L-shaped outdoor bench, send a drawing with every piece's length, depth and thickness, say which way the L turns, and say whether the corner seat has a back on one side or two.
- [Measuring wicker and patio furniture for replacement cushions](https://cushionguide.com/guides/patio-furniture-replacement-cushions/): To order patio furniture replacement cushions, measure the frame's seat opening and back rather than the tired old cushion, then check whether the inserts still spring back.
- [Can you make seat and back cushions for my rattan sofa or lounge set?](https://cushionguide.com/answers/rattan-wicker-replacement-cushions/): Rattan sofa replacement cushions are made from your photos and the inside frame sizes, with every seat and back cushion planned before production.
- [Outdoor chair cushions: measuring patio chairs for seats and backs](https://cushionguide.com/guides/outdoor-chair-cushions/): To order outdoor chair cushions, measure the width between the armrests, the seat depth and the back-cushion height you want, with the chairs standing where they will live.

*Porch light's on — Rosa*

---

Written by Rosa Delgado (https://cushionguide.com/masters/rosa/) for CushionGuide (https://cushionguide.com/about/). The site explains made-to-measure cushions and the partner workshop makes them; measurements are in inches first. This Markdown mirrors the page at https://cushionguide.com/guides/rounded-corner-cushion-measuring/