Materials calculator
Plasterboard calculator
Work out how many standard sheets you need for a wall or ceiling. The default sheet is 2400 × 1200 mm (2.88 m²), a size listed by British Gypsum for Gyproc WallBoard 12.5 mm. The maths is shown in the result.
Common questions
What size is a standard UK plasterboard sheet?
A common standard sheet is 2400 mm × 1200 mm, which covers 2.88 m². British Gypsum’s Gyproc WallBoard 12.5 mm range also includes other lengths and widths, such as 1800 × 900 mm, 2400 × 900 mm, 2700 × 1200 mm and 3000 × 1200 mm. Choose the size you will actually buy.
How do you work out how many sheets I need?
Area in m² (length × height, minus openings, times layers) is divided by the sheet area. A 2400 × 1200 mm sheet is 2.4 × 1.2 = 2.88 m². Your waste allowance is then added, and the result is rounded up to a whole number of sheets.
Is the waste allowance official?
No. There is no official government waste percentage for plasterboard. The default 10% is only a starting point you can change, for cuts and breakages.
Can I put leftover plasterboard in a normal skip?
Usually no. In England, gypsum-based waste must not go to a landfill cell that also takes biodegradable waste, and should be separated for reuse or recovery. Skip firms typically want it in a dedicated skip or bags.