---
title: "Bench Cushion Thickness for Seat Height: The Simple Sum"
url: "https://cushionguide.com/answers/cushion-thickness-for-seat-height/"
section: "The Cutting Table"
author: "Nate Kowalski, The Pattern Engineer of Detroit"
author_url: "https://cushionguide.com/masters/nate/"
published: "2026-07-20"
updated: "2026-09-24"
keywords: "bench cushion thickness for seat height, mudroom bench cushion size, cushion seat height from floor, custom bench cushion thickness, seat height calculator"
---

# How thick should my cushion be to get the seat height I want?

*One line of arithmetic and one question the shop will ask back. Both worked out below, on a real mudroom niche.*

Also asked as: What size cushion for a mudroom bench niche?; Final height from floor to top of cushion

> **The quick answer:** Seat height is bench height plus cushion thickness, so subtract your bench height from the seat height you want. A 15 in (38 cm) bench with a 3 in (7.5 cm) cushion sits at 18 in (46 cm). Send width, length and thickness, and say whether any height you give is measured from the floor to the top of the seat.

![Gray box cushion with white pinstripes on a white shaker storage chest against pink and oxblood walls, pastel rug below](https://cushionguide.com/media/bench-cushions/gray-pinstripe-storage-chest-cushion-pink-two-tone-wall-1600.webp "A tailored gray stripe steadies playful pink walls and a pastel rainbow rug.")

## Key facts

- Final seat height = bench height + cushion thickness.
- A 15 in (38 cm) bench plus a 3 in (7.5 cm) cushion gives an 18 in (46 cm) seat.
- Select the nearest size options, then write the exact size in the note, e.g. 17 x 35.75 x 3 in.
- If you give a seat height, the shop confirms whether it is measured from the floor to the top of the seat.
- Every quote needs width, length and height (thickness).
- The mudroom example took about 1 week to make, plus 3-5 days of delivery.

## “What thickness gets my bench to 18 inches?”

Subtract, partner. The seat height you want, minus the height of the bench, is the cushion thickness. Everything else is paperwork.

A buyer in the US sent the workshop a mudroom niche measuring 17 x 35.75 in (43 x 91 cm), with the bench top 15 in (38 cm) off the floor, and wanted to sit at 18 in (46 cm). Eighteen minus fifteen is 3, so the [bench cushion](https://cushionguide.com/cushions/bench-cushions/) is 3 in (7.5 cm) thick. If you would rather not do the arithmetic, the [seat height calculator](https://cushionguide.com/studio/seat-height-calculator/) does it for you.

## Four steps from tape measure to order note

1. **Measure the niche**: Width front to back, length wall to wall, and the bench top's height from the floor. Here: 17 in, 35.75 in and 15 in.
2. **Subtract**: Target seat height minus bench height gives the thickness: 18 − 15 = 3 in.
3. **Pick the nearest options**: Choose the closest menu sizes: 17 in width, 36 in length, 3 in thickness.
4. **Write the exact size in the note**: Type 17 x 35.75 x 3 in into the personalization note, so the workshop has your real numbers and not the rounded ones.

## “I need a 26 inch seat height. Can you do it?”

Yes; any size can be made. But a number like 26 in (66 cm) gets one question back before anything is cut: do you mean the total height from the floor to the top of the seat?

That question saves foam. A [seat height](https://cushionguide.com/glossary/#seat-height) is a sum, and the shop can't solve it without the other half. Send all three dimensions of the cushion (width, length and height), and if you give a seat height, say it is measured from the floor and add the bench height.

## “How long until it's on the bench?”

The mudroom cushion took about 1 week to make, then 3-5 days in delivery. For the measuring itself, [how to measure a bench for a cushion](https://cushionguide.com/guides/how-to-measure-bench-for-cushion/) walks through the tape work. Measure twice; the fabric remembers.

So: what does your bench measure from the floor, and where do you want to land?

> **Tailor's margin:** Bench cushion thickness is plain subtraction: target seat height minus bench height. An 18 in seat on a 15 in bench needs a 3 in cushion.

> A seat height request like 26 in gets one check before cutting: whether it is measured from the floor to the top of the seat.
>
> — Nate

## Buyer questions

**A common question:** What size cushion should I order for a mudroom bench niche?

**The workshop's answer:** For a 17 x 35.75 in (43 x 91 cm) niche that is 15 in (38 cm) high, a 3 in (7.5 cm) cushion brings the seat to the 18 in (46 cm) you want. Select 17 in width, 36 in length and 3 in thickness, and write the exact 17 x 35.75 x 3 in in the note. It took about 1 week to make, plus 3-5 days of delivery.

**A common question:** Can you make the seat height 26 inches?

**The workshop's answer:** Any size can be made. The shop first checks whether 26 in means the total height from the floor to the top of the seat, and asks for all three dimensions: width, length and height.

**A common question:** Should I take a little off my measurements so the cushion fits?

**The workshop's answer:** No. Send the exact size of the space without deducting anything. The shop makes the cushion to your numbers and handles any fitting allowance in production; piping sits on the seams and doesn't change the size.

## Questions buyers ask next

### Does piping add to the cushion's thickness?

No. Piping sits on the seams and doesn't change the cushion's size, so a 3 in cushion with piping is still made to 3 in. Plan your seat height on the thickness you order, and keep the exact figure in the note.

### What if the thickness I need falls between the menu options?

Pick the nearest thickness option and write the exact thickness in the personalization note. Any size can be made, so the workshop works from the numbers you write rather than from the closest menu choice.

### Which measurements does a bench cushion quote need?

Width, length and height (thickness). For a niche, width runs front to back and length runs wall to wall. If you would rather give a finished seat height, also give the bench height and say the seat figure is measured from the floor.

## Related at the atelier

- [Which side of a cushion is the length and which is the width?](https://cushionguide.com/answers/cushion-length-vs-width-which-side-is-which/): On a cushion, length is the long side, measured left to right across the front, and width is the short side, measured from the front edge to the back edge, the same as seat depth.
- [Entryway Bench Cushion in Chocolate Brown on a Cubby Bench](https://cushionguide.com/readings/chocolate-brown-entryway-cubby-bench-cushion/): A chocolate brown entryway bench cushion suits a white cubby bench because the darkest color in the room goes where the traffic is: it frames the bench and hides scuffs from shoes, bags and damp…
- [Custom Bench Cushion for a Mudroom: How Four Colors Will Age](https://cushionguide.com/readings/four-long-bench-cushions-stacked-rust-cream-piping/): For a mudroom bench cushion, choose the color of the dirt your household makes: charcoal and navy hide mud, oatmeal hides pale dust and hair.
- [Zebra Print Bench Cushion: Thickness vs Seat Height](https://cushionguide.com/readings/zebra-print-bench-cushion-french-doors-sheer-curtain/): Cushion thickness adds straight onto seat height: a 4 in (10 cm) cushion on a storage bench raises the seat by about 4 in, less a little sink when someone sits.
- [Should I give my exact measurements or make the cushion a bit smaller?](https://cushionguide.com/answers/exact-measurements-or-size-down-custom-cushion/): No, don't make the cushion smaller than the bench: give the true, exact size of the space, end to end, without subtracting half an inch or a centimeter.
- [My size isn't in the dropdown. How do I order an exact size like 18.5 x 51.25 in?](https://cushionguide.com/answers/order-custom-cushion-size-not-listed/): Pick the dropdown range that covers your cushion's widest and deepest measurements, then type the exact size in the Add your personalization (Notes) box, and the cushion is cut from that note.
- [How thick should a bench cushion be? Work back from seat height](https://cushionguide.com/guides/cushion-thickness-seat-height-calculator/)
- [Cushion measurements explained: length, depth, thickness and units](https://cushionguide.com/guides/cushion-measurements-length-depth-thickness/)

*± 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/cushion-thickness-for-seat-height/