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The Cutting Table · a common question

How do I measure a cushion with rounded corners or a curved end?

Also asked as:rounded corners on three edgeslong bench with one side curved

Curves scare people off custom cushions, partner. They shouldn't. A curve is a straight edge that changes its mind at a spot you can measure.

Answered by

The Pattern Engineer of Detroit ·

The quick answer

To measure a rounded-corner cushion, write each edge as if the corners were square, then mark where each curve begins along both edges, such as 8 in (20 cm) from the corner. For a curved end, add the curve's span and its depth. Or trace the curve on paper, photograph it beside a tape measure, and the workshop sends a template to confirm.

Olive green velvet bench cushion with self piping on a slab oak bench, cream boucle pillows, abstract art and a fig treeSave
An olive velvet cushion softens a plain oak bench, its color pulled straight from the abstract print above.

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Key facts

  • Give every edge length as if the corners were square.
  • A rounded corner is defined by where the curve starts, measured from the corner along both edges.
  • Note each corner separately if the curves differ.
  • A curved end needs the span between where the curve starts and ends, plus its depth from top to bottom.
  • A curved top needs each side's straight run, the width where the curve starts and the total height to the top of the curve.
  • A paper tracing photographed beside a tape measure is accepted.
  • The workshop sends a template to confirm and asks before cutting if anything is missing.

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Precision starts on the phone. Give the workshop your measurements and they will read them back to you, edge by edge. — Nate

Leave your details and the workshop will call you to confirm measurements, fabric, foam and piping. No prices, dates or payment on this page: it is a request, not an order.

Fabric · Foam · Pipingwhat the workshop will confirm with you

Fabric
The cover cloth: weave, color and care code.
Foam
The core: its density and thickness set the feel.
Piping
The corded seam edge: matching, contrast or none.
Only for this request: no marketing calls or texts. Outside the US, add the country code.
In inches: length × depth × thickness, plus any angles or cut corners.

* Required. A member of the workshop team will call you to talk it through; nothing is charged and nothing is made until you have agreed on every detail with them.

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How do you measure a rounded corner on a cushion?

Measure each edge to where the corner would be if it were square. Then, at each rounded corner, measure how far from that imaginary corner the curve begins, along both edges.

If the corners differ, write each one down; one buyer's three curves started at about 7, 7 7/8 and 8 5/8 in (18, 20 and 22 cm). Angles are just lengths in disguise, and so are curves. The rounded-corner pattern shows the drawing.

The numbers for each kind of curve

  1. Rounded corners

    Distance from the square corner to where the curve starts, along both edges.

  2. A curved end

    The span between where the curve starts and ends, and the depth from the top of the curve to the bottom: its chord and rise.

  3. A curved top

    Each side's straight run before the curve, the width where the curve starts, and the total height from the bottom edge to the top of the curve.

After you upload the drawing

Put every number on one drawing, add photos of the seat, and upload both on the custom-shape listing. The workshop sends a template to confirm and asks before cutting if anything is missing. A banquette cushion with one curved end needs just two extra numbers. Which of your corners is the odd one out?

A curved end on a bench cushion needs two numbers: the span between where the curve starts and ends, and its depth from top to bottom.

Nate
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Buyer questions

  1. A common question

    My bench has rounded corners. How do I give you the curves?

    The workshop's answer

    Write each edge's full length as if the corners were square, then mark how far from each corner the curve begins, each one separately if they differ. Or trace the corner and photograph it beside a tape measure.

  2. A common question

    How do I measure a cushion with a curved top?

    The workshop's answer

    Three numbers: how far each side runs straight before the curve begins, the width where the curve starts, and the total height from the bottom edge to the top of the curve.

  3. A common question

    How do I measure a bench with one curved end?

    The workshop's answer

    Measure from the top of the curve to the bottom, and the distance between where the curve starts and ends. Write both on your drawing; missing numbers get asked about before cutting.

Questions buyers ask next

Do I need a paper template for a rounded corner?

Not usually. Two numbers per corner describe a simple round. A paper tracing helps when the curve isn't a simple arc; photograph it beside a tape measure so the scale is clear.

Where do I measure the depth of a curved end?

From the top of the curve straight down to the line where the curve starts, square to that line. Measure the span along that same line, from where the curve begins to where it ends.

Should I take a little off so a curved cushion fits?

No. Send the exact size of the space and deduct nothing. The cushion is made to your numbers, and the fitting allowance is handled in production; piping sits on the seams without changing the size.