---
title: "Chair Cushion Thickness: 2 in (5 cm) or 3 in (7.5 cm)?"
url: "https://cushionguide.com/answers/chair-seat-cushion-thickness-5cm-vs-7-5cm/"
section: "The Cutting Table"
author: "Nate Kowalski, The Pattern Engineer of Detroit"
author_url: "https://cushionguide.com/masters/nate/"
published: "2026-07-03"
updated: "2026-09-24"
keywords: "chair cushion thickness, chair pad 2 inch vs 3 inch, seat cushion compression, dining chair cushion thickness, bench cushion thickness for elderly"
---

# Should a chair seat cushion be 2 in (5 cm) or 3 in (7.5 cm) thick?

*An inch sounds small until it moves your knees. Here is how chair pads get sized, compression math included.*

Also asked as: Deciding between 2 in (5 cm) or 3 in (7.5 cm); Do they collapse a lot when sitting?

> **The quick answer:** 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. The firm 32-density foam won't collapse, but a 2 in pad compresses slightly, so a 15⅜ in (39 cm) chair lands near 16½–17 in (42–43 cm). For long sitting on a bench, choose 4 in (10 cm).

![Round dove gray tie-on seat pad on a black bentwood chair beside a Parisian bistro table with coffee, peonies and a book](https://cushionguide.com/media/dining-chair-cushions/round-dove-gray-pad-black-bentwood-chair-paris-1600.webp "A round seat pad with ties softens a cane bentwood chair in a Parisian salon with herringbone parquet.")

## Key facts

- 2 in (5 cm) is recommended for chair pads; 3 in (7.5 cm) or 4 in (10 cm) are possible.
- The velvet seat cushion comes 4 in (10 cm) thick as standard.
- 32-density foam (32 kg/m³, about 2 lb/ft³) is dense and firm and does not collapse.
- A 2 in (5 cm) cushion compresses slightly under body weight.
- For benches used for long sitting, 4 in (10 cm) gives the best support; 3 in (7.5 cm) is the alternative.
- Back cushions can be thinner, around 2 in (5 cm).
- Nursery armchair seat and back cushions have been made 5 in (13 cm) thick, filled with fiber and silicone balls.

## Thickness by seat, from the workshop's own answers

| Seat | Thickness | Note |
|---|---|---|
| Chair pad, everyday | 2 in (5 cm) | The usual recommendation |
| Chair pad, more cushion | 3 or 4 in (7.5 or 10 cm) | Made on request |
| Velvet seat cushion | 4 in (10 cm) | Standard thickness |
| Bench for long sitting | 4 in (10 cm) | 3 in is the alternative |
| Back cushion | about 2 in (5 cm) | Thinner than the seat |
| Nursery armchair | 5 in (13 cm) | Fiber and silicone-ball fill |

## The compression math on a 15⅜ in chair

The case that comes up most: a chair seat at 15⅜ in (39 cm), a target seat height of 16½–17 in (42–43 cm), and the question, 2 in or 3 in?

On paper, 15¼ in (39 cm) plus a 2 in (5 cm) pad is 17¼ in (44 cm). Sit down and it is not. The 32-density foam (32 kg/m³, about 2 lb/ft³) is dense and firm, so it holds its shape, but a pad that thin still gives a little. Budget roughly ½–¾ in (1–2 cm) of give and 2 in lands inside the 16½–17 in (42–43 cm) window; 3 in would overshoot it. The workshop asks first whether the cushion is for a chair, bench or floor seating, because each carries you differently.

That give is called [compressed height](https://cushionguide.com/glossary/#compressed-height); the [foam density Pattern](https://cushionguide.com/guides/foam-density-lb-ft3-kg-m3/) explains why denser foam gives less, and the [seat height calculator](https://cushionguide.com/studio/seat-height-calculator/) runs your own numbers.

## A bench for a father who sits a long while

A buyer wrote to the workshop wanting outdoor chair pads and a bench cushion that would be really comfortable for an elderly father. The chairs got 2 in (5 cm), with 3 or 4 in available. The bench got 4 in (10 cm) for long sitting, 3 in as the fallback, and back cushions of about 2 in. Different seats, different hours, different thickness. Partner, that is the whole method.

> **Tailor's margin:** A 2 in (5 cm) chair pad on firm 32-density foam gives a little: on a 15⅜ in (39 cm) chair you sit at about 16½–17 in (42–43 cm).

> Chair pads: 2 in (5 cm). Benches you sit on for hours: 4 in (10 cm). Back cushions: about 2 in. Firm 32-density foam holds all three.
>
> — Nate

## Buyer questions

**A common question:** Will a 2 in (5 cm) seat cushion flatten when I sit? Should I go 2 in or 3 in for a chair?

**The workshop's answer:** The 32-density foam is dense and firm, so it keeps its shape, but 2 in is on the thin side and compresses slightly. On a 15¼ in (39 cm) chair aiming for 16½–17 in (42–43 cm), 2 in lands close to the target. The shop first asks whether it's for a chair, bench or floor seating.

**A common question:** How thick should outdoor chair pads be, and a bench cushion for an older person?

**The workshop's answer:** Chairs: 2 in (5 cm), with 3 or 4 in possible. A bench for long sitting gets the best support at 4 in (10 cm), 3 in as the alternative, with back cushions around 2 in.

**A common question:** How thick are your velvet seat cushions? I need four small ones.

**The workshop's answer:** The standard velvet seat cushion is 4 in (10 cm) thick, sized to order. Four 14½ x 16½ in (37 x 42 cm) cushions were quoted together in any chart fabric.

**A common question:** Can you remake the seat and back cushions on a nursery armchair, 5 in thick?

**The workshop's answer:** Yes. A 20 x 22 x 5 in seat and a 21 x 27 x 5 in back were quoted as a pair, filled with fiber and silicone balls. Thicker than 5 in is possible.

## Questions buyers ask next

### How much does a firm foam chair pad squash when you sit on it?

Only slightly. On the workshop's numbers, a 2 in (5 cm) pad of 32-density foam on a 15⅜ in (39 cm) chair sits at about 16½–17 in (42–43 cm): roughly ½–¾ in of give.

### Is a 4 in cushion too thick for a dining chair?

It can be made, but it lifts you more than most chairs need. The workshop recommends 2 in (5 cm) for everyday chair pads, makes 3 and 4 in on request, and saves 4 in for benches people sit on for hours.

### Should the back cushion match the seat cushion's thickness?

Not necessarily. In the workshop's advice for a bench used for long sitting, the seat goes 4 in (10 cm) while the back cushions stay around 2 in (5 cm), so the backrest doesn't crowd the seat.

## Related at the atelier

- [Chair Cushion with Ties: A Navy Floral Pad and 5 Mistakes](https://cushionguide.com/readings/navy-floral-dining-chair-pad-ties-cane-chair/): A chair cushion with ties stays put only if you ask for the ties when you order, put them at the back legs and send a drawing for any shaped seat.
- [Dining Chair Cushion With Ties: Where to Spend, Where to Save](https://cushionguide.com/readings/terracotta-tie-on-chair-pad-rush-seat-kitten/): On a set of chair cushions with ties, spend on foam that holds its shape, an exact fit for each seat and fabric samples; save on thickness and extra trims.
- [Chair Cushion With Ties for Guests: Cranberry Velvet on Pine](https://cushionguide.com/readings/cranberry-velvet-tie-cushion-pine-farmhouse-chair/): A chair cushion with ties suits a farmhouse table that seats guests because two pairs of ties, one at the side posts and one at the back posts, keep a thick pad square on smooth pine while people…
- [How do I measure a dining chair seat for a cushion?](https://cushionguide.com/answers/how-to-measure-chair-seat-cushion/): 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.
- [Can you copy my existing chair seat and back cushions?](https://cushionguide.com/answers/replicate-chair-seat-back-cushions/): Existing chair seat and back cushions can be replicated from photos of the chair and the measurements of each cushion.
- [Do you make custom chair, bar stool or wheelchair cushions?](https://cushionguide.com/answers/custom-chair-stool-cushion-size/): Custom chair, bar stool and wheelchair cushions are made in any size and thickness, filled with 2.0 lb/ft³ (32 kg/m³) high-resilience foam that stays firm and doesn't flatten for years.
- [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/chair-seat-cushion-thickness-5cm-vs-7-5cm/