How many sheets of plasterboard? Table by room size (UK)

Sheets of plasterboard by room size
Room	In feet	Ceiling area	Boards for the ceiling	Wall area, less the door	Boards for the walls	Boards for walls and ceiling	Your room
2 × 2 m	6.6 × 6.6 ft	4 m²	2	17.69 m²	7	9	Open 2 × 2 m in the planner
2.5 × 3 m	8.2 × 9.8 ft	7.5 m²	3	24.89 m²	10	13	Open 2.5 × 3 m in the planner
3 × 3 m	9.8 × 9.8 ft	9 m²	4	27.29 m²	11	14	Open 3 × 3 m in the planner
3 × 3.5 m	9.8 × 11.5 ft	10.5 m²	5	29.69 m²	12	16	Open 3 × 3.5 m in the planner
3 × 4 m	9.8 × 13.1 ft	12 m²	5	32.09 m²	13	17	Open 3 × 4 m in the planner
3.5 × 4 m	11.5 × 13.1 ft	14 m²	6	34.49 m²	14	19	Open 3.5 × 4 m in the planner
4 × 4 m	13.1 × 13.1 ft	16 m²	7	36.89 m²	15	21	Open 4 × 4 m in the planner
4 × 5 m	13.1 × 16.4 ft	20 m²	8	41.69 m²	16	24	Open 4 × 5 m in the planner
5 × 5 m	16.4 × 16.4 ft	25 m²	10	46.49 m²	18	28	Open 5 × 5 m in the planner
5 × 6 m	16.4 × 19.7 ft	30 m²	12	51.29 m²	20	32	Open 5 × 6 m in the planner

Each row is the planner’s answer for that room, worked out when this page was built. The link at the end of a row opens the planner with that room filled in, to change the measurements and the product figures.

The boards are counted by area: the area to board, plus 10% for cuts, divided by the area of one board and rounded up. It is not a cutting layout, so check awkward shapes before buying. How many sheets of plasterboard do I need? works through a 4 m × 3 m room that also has a window.

The last column is not always the other two added together. Bought for the walls and the ceiling at once, the boards are rounded up once, which comes to a board fewer in the 3 × 3 m room, the 3 × 3.5 m room, the 3 × 4 m room, the 3.5 × 4 m room and the 4 × 4 m room.

The boards are 1.2 m × 2.4 m, the planner’s generic example, in one layer. Another board size or a second layer changes the count: the plasterboard calculator takes the size and the layers of yours.

What the table assumes

Each room is a rectangle 2.4 m high, with one door 0.762 m × 1.981 m.

1 door taken off the wall area; nothing is taken off the ceiling or the floor.
Plasterboard is counted by area across the chosen surfaces, in 1.2 m × 2.4 m boards, 1 layer, with 10% extra. This is not a cutting layout; check awkward shapes before buying.
Every quantity is rounded once, at the end, up to whole packs. Working uses unrounded figures.
Plasterboard use generic example figures, not the figures of any product. Enter the figures from the tin or pack for a closer answer.
Board size, layers and allowance (generic examples). Doors and windows entered for the room are taken off the wall area.

How this table was made

It was worked out when this page was built, by the same room planner and formulas as the editable list: each row is one room sent through the planner. The room sizes are round examples. Product coverage, pack and allowance figures are the planner’s labelled generic examples, not figures for a product.

AI tools drafted the page and automated tests compare every cell with the planner. It has not been checked by a tradesperson or anyone outside the build. No price is shown or used.

Before you use it

Measure your own room, its doors and its windows. Check the figures against the room, and follow each product's own instructions: they decide coverage, coats and preparation.

Built and checked with AI tools, not yet by a tradesperson or anyone outside the build. Estimates are arithmetic on your measurements and the figures shown with them: follow each product's own instructions.