# Sofa Size Calculator

URL: https://speedycalculator.com/calculators/everyday-life/sofa-size/
Last updated: 2026-10-25

> The sofa size calculator works out the largest sofa that will fit through your doorway, hallway, stairs or lift and against your wall – maximum depth, height and width – and which seat count fits.

## Inputs

- Delivery route
- Narrowest door width (in, cm, ft, m)
- Hallway width (in, cm, ft, m)
- Staircase width (in, cm, ft, m)
- Lift height (in, cm, ft, m)
- Lift depth (in, cm, ft, m)
- Wall length (in, cm, ft, m)

## Results

- Maximum frame height (depth through doors)
- Maximum sofa width
- Maximum depth (lift)
- Largest common size that fits

## Formula

```
Frame height (depth that can pass) ≤ narrowest of door, hallway and stair width − 4 in
Width ≤ lift height − 4 in (if delivered by lift) and ≤ wall length − 24 in
Depth ≤ lift depth − 4 in
```

## Explanation

Many sofas are returned because they cannot get into the room. Sofas are usually carried on end or on their back, so the frame height must clear the narrowest doorway or hallway, and with a lift the sofa's length must fit the lift's diagonal or height. Leave about 12 in clear at each end of the wall.

### How to use the Sofa Size Calculator

- **Delivery route**
- **Narrowest door width**
- **Hallway width**
- **Staircase width**
- **Lift height**
- **Lift depth**
- **Wall length**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Choose how the sofa gets in, then enter the narrowest door, hallway and stair widths, the lift dimensions (if any) and the length of the wall it will stand against.

### Tips

- Use the figures from your own bills and product labels – prices and appliance ratings vary widely.
- Look at yearly totals: small daily costs add up and make it easier to compare options.
- Round quantities up to whole packs, rolls or bulbs when you shop.
- Re-check the numbers when prices change; most results scale directly with the unit price.

### Common mistakes to avoid

- Confusing watts (power) with watt-hours or kilowatt-hours (energy).
- Comparing prices without bringing them to the same unit first.
- Ignoring one-off costs such as installation, delivery or replacement parts.

### Inputs explained

FieldWhat to enterDelivery routeChoose one: Lift / elevator, Stairs and doors onlyNarrowest door widthUnits: in, cm, ft, mHallway widthUnits: in, cm, ft, mStaircase widthUnits: in, cm, ft, mLift heightUnits: in, cm, ft, mLift depthUnits: in, cm, ft, mWall lengthUnits: in, cm, ft, m

### Example values

How the main result changes when **Narrowest door width** changes and everything else stays at the example values above:

Narrowest door width (in)Maximum sofa width (in)169624963296409648966496

## Worked example

Inputs — Delivery route: Stairs and doors only; Narrowest door width: 32 in; Hallway width: 36 in; Staircase width: 36 in; Lift height: 84 in; Lift depth: 60 in; Wall length: 120 in.

Results — Maximum frame height (depth through doors) = 28 in; **Maximum sofa width = 96 in**; Maximum depth (lift) = 28 in; Largest common size that fits = 4-seater (≈ 90 in).

## FAQ

**How do I know if a sofa will fit through the door?**
Its height or depth (whichever is smaller) must be less than the door width, with a little room to tilt.

**How long is a 3-seater sofa?**
Typically 72–84 in (180–215 cm).

**Can legs be removed?**
Usually – removing legs and doors from their hinges gains 1–3 in.

**What formula does the Sofa Size Calculator use?**
Frame height (depth that can pass) ≤ narrowest of door, hallway and stair width − 4 in.