---
title: "Trapezoid Cushion Measurements A, B, C, D: Labeling Every Side"
url: "https://cushionguide.com/answers/trapezoid-cushion-drawing-label-sides/"
section: "The Cutting Table"
author: "Nate Kowalski, The Pattern Engineer of Detroit"
author_url: "https://cushionguide.com/masters/nate/"
published: "2026-05-14"
updated: "2026-05-14"
keywords: "trapezoid cushion measurements a b c d, trapezoid cushion measurements, how to label trapezoid cushion sides, angled window seat cushion measurements, trapezoid bench cushion drawing"
---

# How do I label the sides on my trapezoid cushion drawing?

*Letters beat adjectives. 'The long side by the window' can mean two different edges; 'C 68 in' means exactly one.*

Also asked as: Give the measurements with the letters from your picture?; Angled top trapezoid measurements A to F.

> **The quick answer:** Give every edge of the trapezoid a letter and a length: A, B, C and D for the four sides, plus E and F for clipped corners or end pieces, then add the depth and thickness. Order the nearest size range, send the lettered sketch, and the workshop checks the geometry and returns a full list to confirm before cutting.

![Flax linen bay window cushion with wine-red piping, linen pillows and a striped lumbar on a white storage bench](https://cushionguide.com/media/bay-window-cushions/flax-bay-window-cushion-wine-piping-striped-lumbar-1600.webp "Four pillows, a draped throw and a thin wine welt turn a plain storage bench into the softest seat in the room.")

## Key facts

- Sides are labeled A to D, with E and F for clipped corners or end sides.
- The shop's lettered template and a hand sketch are both accepted.
- Measurements can be in inches or centimeters.
- Order the nearest size range, such as 22 x 68 in (56 x 173 cm), then send the exact sides.
- The workshop checks that the shape closes and calculates any unlabeled edge.
- A full measurement list comes back for confirmation before cutting.
- Standard trapezoid thickness is 4 in (10 cm).

## Lettering the drawing, edge by edge

1. **Sketch the seat from above**: Rough is fine: pencil on paper, then a photo. The shop's lettered trapezoid template works too.
2. **Put a letter on every edge**: A, B, C and D around the outline. Clipped corners or short end sides get E and F.
3. **Write a length beside each letter**: Inches or centimeters, one unit throughout. One bench read A 6, B 6, C 68, D 34, E 23, F 23 in.
4. **Add depth and thickness**: Depth goes in the middle, front to back: 22 in (56 cm) on that bench. Thickness is 4 in (10 cm) unless you say otherwise.
5. **Order the nearest range, then send the sketch**: Pick the closest drop-down size, such as 22 x 68 in (56 x 173 cm), and send the lettered drawing with the order.

## What happens after the letters arrive

Angles are just lengths in disguise. Give every edge and the depth, and the angles are already decided; nobody needs a protractor.

The workshop checks that your lengths close into a real shape. If an edge went unlabeled, it gets calculated. Then a full list comes back: front, window edge, depth, slanted sides, thickness and piping. You confirm it, and only then is the fabric cut. A small difference between the two slanted sides is read as hand-measuring [tolerance](https://cushionguide.com/glossary/#tolerance), not as a mystery.

How many edges does your seat really have, partner: four, or six? The [trapezoid cushion calculator](https://cushionguide.com/studio/trapezoid-cushion-calculator/) lets you try the numbers first, the [trapezoid measuring pattern](https://cushionguide.com/guides/trapezoid-cushion-measurements/) shows where the tape goes, and finished pieces live under [bay window cushions](https://cushionguide.com/cushions/bay-window-cushions/).

## Two real lettered orders, side by side

| Label | Six-sided bench | Four-sided window seat |
|---|---|---|
| A | 6 in (15 cm) | 43 1/4 in (110 cm) |
| B | 6 in (15 cm) | 48 in (122 cm) |
| C | 68 in (173 cm) | 13 3/4 in (35 cm) |
| D | 34 in (86 cm) | 13 3/8 in (34 cm) |
| E | 23 in (58 cm) | not needed |
| F | 23 in (58 cm) | not needed |
| Depth | 22 in (56 cm), in the middle | taken from the drawing |
| Thickness | 4 in (10 cm) standard | 3 1/2 in (9 cm) |

> **Tailor's margin:** Label a trapezoid cushion by letter, not description: 'C 68 in' names one edge, while 'the long window side' can mean two.

> A trapezoid cushion drawing needs a length on every lettered edge, A to D plus E and F for clipped corners, and the depth taken in the middle.
>
> — Nate

## Buyer questions

**A common question:** What measurements do you need for a trapezoid bay window seat cushion?

**The workshop's answer:** Every edge: front, window edge, left and right angled ends, plus the depth, ideally lettered on the template or on a photographed sketch. The shop checks the shape closes, fills in any unlabeled edge by calculation and sends a full list to confirm.

**A common question:** My bench cushion has angled ends. What do you need from me?

**The workshop's answer:** Label every side, A to F as needed, and give the depth: for example A 6, B 6, C 68, D 34, E 23, F 23 in with 22 in depth in the middle. Choose the nearest size range, such as 22 x 68 in, and send the lettered drawing so the shop can confirm before cutting.

**A common question:** My cushions are trapezoids with different angles. How do I send the sizes?

**The workshop's answer:** Draw the shape on paper with every side labeled, in inches or centimeters, and send a photo. The quote is made from that drawing. Two tufted trapezoid cushions with center buttons were ordered exactly this way.

**A common question:** My bay window isn't symmetrical. Can you still make the cushion?

**The workshop's answer:** Yes. Order on the trapezoid or custom-shape listing, choose the size by depth and overall length, and upload a sketch with every edge, the depth and a photo of the seat. The cushion is cut to your drawing.

## Questions buyers ask next

### What if my left and right slanted edges come out a fraction apart?

Write down what you measured. Small differences between the two slanted sides are treated as hand-measuring tolerance, and the confirmation list the workshop sends lets you settle the final numbers before any fabric is cut.

### Do I have to use the shop's letters on my drawing?

No. The shop's lettered template helps, but a hand sketch with your own letters works the same way, as long as every edge carries one letter and one length and the depth is marked in the middle.

### Can a lettered trapezoid drawing include tufting or buttons?

Yes. Trapezoids have been made tufted, in corduroy and with center buttons. Mention the tufting alongside your lettered measurements so it appears on the confirmation list with the thickness and piping.

## Related at the atelier

- [The size menu only asks for width and length. What do I pick for a trapezoid cushion?](https://cushionguide.com/answers/trapezoid-cushion-size-selection-width-length/): Pick the size range that covers your trapezoid's longest side and its deepest depth; that choice only sets the price.
- [What measurements do you need for a trapezoid bay window cushion?](https://cushionguide.com/answers/trapezoid-cushion-measurements-needed/): Send every edge of the trapezoid: the front, the back, both angled sides and any clipped corners, plus one straight depth and the thickness.
- [Can you make a cushion for a bay window with 5 windows, all at different angles?](https://cushionguide.com/answers/multi-angle-bay-window-cushion-5-windows/): Yes: a bay window seat cushion can have any number of angles, including 5-window, pentagon and hexagon bays.
- [Bay Window Cushion in Mustard: 5 Mistakes This Photo Avoids](https://cushionguide.com/readings/mustard-trapezoid-bay-seat-terracotta-piping-arched-windows/): A bay window cushion fits when it is cut as a true trapezoid: a long front, a shorter back against the wall, and two angled ends measured one at a time.
- [Bay Window Cushion in Dusty Rose Velvet: The Piping Decision](https://cushionguide.com/readings/dusty-rose-velvet-bay-window-cushion-angled-end/): On a bay window cushion, the piping choice decides how loudly the angles show: self piping keeps the long edge quiet, contrast piping draws every corner like a pencil line, and no piping leaves a…
- [Bay Window Cushion Set in Navy Floral, Cut in Three Pieces](https://cushionguide.com/readings/three-piece-navy-floral-bay-window-cushion-set/): A three-sided bay window cushion works best as three pieces: a center rectangle and two end pieces cut to each wall's angle, with the joins under the mullions.
- [How to measure a trapezoid cushion so the numbers close](https://cushionguide.com/guides/trapezoid-cushion-measurements/)
- [Measuring a hexagon cushion, or an octagon, without a protractor](https://cushionguide.com/guides/hexagon-and-octagon-cushion-measuring/)

*± 1/4 in — Nate*

---

Written by Nate Kowalski (https://cushionguide.com/masters/nate/) 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/answers/trapezoid-cushion-drawing-label-sides/