---
title: "How to Measure a Chair Seat for a Cushion: 3 or 6 Numbers"
url: "https://cushionguide.com/answers/how-to-measure-chair-seat-cushion/"
section: "The Cutting Table"
author: "Nate Kowalski, The Pattern Engineer of Detroit"
author_url: "https://cushionguide.com/masters/nate/"
published: "2026-01-20"
updated: "2026-01-20"
keywords: "how to measure a chair seat for a cushion, dining chair cushion measurements, spindle back chair cushion, tapered chair pad size, chair pad measuring"
---

# How do I measure a dining chair seat for a cushion?

*Product pages rarely list the seat's real size, partner. Your tape measure does. Here is how many numbers each seat shape needs, and which ones.*

Also asked as: How do I measure my chair seat?; Cushion for a spindle-back chair?

> **The quick answer:** Measure the seat itself by hand: for a tapered seat, give the depth plus the front and back widths; for a shaped or spindle-back seat, give six numbers, three widths and three depths. Upload a drawing or photo if the seat isn't a rectangle, and the workshop sends a sketch for you to confirm before anything is cut.

![Round box cushions in coral, teal, mustard and sage stripes on four teak slat-back chairs around a round teak garden table](https://cushionguide.com/media/dining-chair-cushions/round-rainbow-stripe-cushions-teak-chairs-courtyard-1600.webp "Round box cushions in a bright stripe echo the round teak table and soften four slatted chairs.")

## Key facts

- Measure chair seats by hand; product pages rarely give detailed seat sizes.
- A tapered seat needs its depth plus back and front widths, e.g. 21 in (53 cm) deep, 19 in (48 cm) at the back, 20 1/2 in (52 cm) at the front.
- A shaped or spindle-back seat takes six measurements: three widths and three depths.
- Back width is measured at the spindles; depth is measured at the left, center and right.
- To let the wood trim show, size the cushion down yourself before you send the numbers.
- Non-rectangular seats need a drawing or photo with measurements.
- A sketch comes back for confirmation before cutting.

## Seat shape against the numbers to send

| Seat shape | What to measure | Example |
|---|---|---|
| Rectangle or square | Width and depth, plus the thickness you want | State the thickness every time |
| Tapered, one edge wider | Depth, back width, front width | 21 in deep, 19 in back, 20 1/2 in front (53, 48, 52 cm) |
| Shaped or spindle-back | H1 back width at the spindles, H2 widest, H3 front; V1–V3 depth at left, center, right | 14 1/2, 17, 14 in wide; 14 1/2, 15 1/2, 13 1/2 in deep (37, 43, 36; 37, 39, 34 cm) |
| Framed seat, trim meant to show | Your hand measurement, minus the wood you want visible | Sized down by you |

## The six-number method, H1 to V3

1. **Photograph the seat from above**: Straight down, whole seat in frame. The six lines get marked on a photo like this.
2. **H1: back width at the spindles**: Across the back of the seat, where the spindles meet it.
3. **H2 and H3: widest, then front**: The widest point of the seat, then along the front edge.
4. **V1, V2, V3: depth at left, center, right**: One shaped seat read 14 1/2, 15 1/2 and 13 1/2 in. A single depth would have been wrong twice.
5. **Send it, then check the sketch**: A drawing comes back, and nothing is cut until you confirm it.

## Why the tape goes on the chair, not the listing

Product pages rarely give a seat's detailed size. So the tape goes on the chair. Tolerance is kindness to your future self: write halves, not guesses.

Want the wood trim to show, as on Cesca-style chairs? Take that off your numbers first; the cushion is made to what you write. The [dining chair pad Pattern](https://cushionguide.com/guides/dining-chair-pad-measurements/) covers ties, the [chair cushion builder](https://cushionguide.com/studio/chair-cushion-builder/) tries the shape in 3D, and [dining chair cushions](https://cushionguide.com/cushions/dining-chair-cushions/) shows finished seats.

> **Tailor's margin:** Measure a spindle-back chair seat six times: three widths (back at the spindles, widest, front) and three depths (left, center, right).

> A tapered chair seat needs three numbers, not two: depth, back width and front width, such as 21, 19 and 20 1/2 in.
>
> — Nate

## Buyer questions

**A common question:** How should I measure a spindle-back dining chair seat so the cushion fits exactly?

**The workshop's answer:** Three widths and three depths, marked on a photo of the chair: back width at the spindles, widest width, front width, then depth at left, center and right, such as 14 1/2, 17, 14 in and 14 1/2, 15 1/2, 13 1/2 in.

**A common question:** My chair seats are wider at the front than the back. How do I order?

**The workshop's answer:** Give the depth, back width and front width, for example 21, 19 and 20 1/2 in. A measurement sketch comes back, and production waits for your confirmation.

**A common question:** Can cushions for Cesca-style chairs be a little smaller so the wood trim shows?

**The workshop's answer:** Yes. Measure the chairs by hand and size the cushions down as you like, then upload a drawing or photo if the shape isn't a rectangle.

## Questions buyers ask next

### Should I measure my old chair pads or the seat itself?

If the old pads fit well, their sizes are a fair start. If not, measure the seat. For new covers on foam you own, measure the bare insert and include its thickness.

### What if my seat is too odd for six numbers?

Photograph it and draw it on paper with every side measured and labeled A, B, C. The workshop asks about any missing side, then sends its own drawing for your OK.

### Can a chair cushion be notched around a post?

Yes. Measure each notch's depth, width and position and send a sketch with a photo. The notched shape is drawn and sent for approval before quoting.

## Related at the atelier

- [Chair Cushion with Ties for a Victorian Spindle-Back Chair](https://cushionguide.com/readings/mustard-tie-on-pad-victorian-spindle-back-chair/): A chair cushion with ties for a spindle-back chair needs three measurements, not two: the front width, the back width between the rear posts, and the depth at the center.
- [Can you make a chair cushion that's wider at the front than the back?](https://cushionguide.com/answers/tapered-chair-cushion-wider-front/): A tapered chair cushion that is wider at the front than the back is routine work.
- [Chair Cushion with Ties: Measuring a Teak Armchair Seat and Back](https://cushionguide.com/readings/slate-blue-seat-blue-stripe-back-teak-armchair/): To order a chair cushion with ties for an armchair, measure the seat inside the arms at the front and at the back, the depth from the front edge to the back slats, and the back from the seat frame…
- [Dining Chair Cushion With Cream Piping on a Slat-Back Chair](https://cushionguide.com/readings/steel-blue-seat-pad-blond-slat-back-dining-chair/): Piping on a dining chair cushion should repeat something already in the room: here a cream welt on a steel-blue linen-look pad echoes the white window frames and radiators, so the outline looks…
- [What do you need from me to make seat and back cushions for my chairs?](https://cushionguide.com/answers/measure-armchair-seat-and-back-cushions/): To make seat and back cushions for a garden or patio armchair, send the width between the armrests, the seat depth and the back-cushion height you want, plus a photo of the chair or its reference…
- [Should a chair seat cushion be 2 in (5 cm) or 3 in (7.5 cm) thick?](https://cushionguide.com/answers/chair-seat-cushion-thickness-5cm-vs-7-5cm/): For most chair pads, 2 in (5 cm) is the right thickness, with 3 in (7.5 cm) or 4 in (10 cm) available for more cushion.
- [How to measure dining chairs for seat pads with ties](https://cushionguide.com/guides/dining-chair-pad-measurements/)
- [Velvet seat cushions: how the pile catches the light on a chair](https://cushionguide.com/guides/velvet-seat-cushions/)

*± 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/how-to-measure-chair-seat-cushion/