Drywall and Plasterboard Sheet Sizes: US vs UK vs Australia
The same job is called drywall in the US, plasterboard in the UK and gyprock in Australia — and the sheets come in different sizes. Here is how they compare and how to pick the right one.
Common sheet sizes
| Market | Width | Common lengths | Area per sheet |
|---|---|---|---|
| US / Canada | 4 ft (1.22 m) | 8, 10, 12 ft (14 ft special order) | 32, 40, 48 sq ft |
| UK / Ireland | 1200 mm | 2400, 2700, 3000 mm | 2.88, 3.24, 3.6 m² |
| UK (small sheets) | 900 mm | 1800 mm | 1.62 m² |
| Australia / NZ | 1200 mm (1350 also) | 2400–6000 mm | 2.88 m² and up |
Thickness
| Use | US | UK / AU |
|---|---|---|
| Standard walls | ½ in | 12.5 mm (UK) / 10 mm (AU) |
| Ceilings, wider joist spacing | ⅝ in or ½ in sag-resistant | 12.5–15 mm / 10–13 mm |
| Fire-rated | ⅝ in Type X | 12.5–15 mm fire board |
| Curved or overlay | ¼–⅜ in | 6.5–9.5 mm |
Moisture-resistant boards (green or blue faced in many ranges) suit bathrooms and utility rooms, although tile backer or cement board is preferred directly behind showers.
Choosing a sheet size
- Longer sheets mean fewer joints, which saves taping and sanding time and gives a better finish.
- Match the length to the wall when possible: a 12 ft wall hung horizontally with 12 ft sheets has no butt joints.
- Heavier sheets are harder to carry, especially upstairs or through narrow doors. A ½ in 4 × 12 ft sheet weighs around 70–80 lb.
- For ceilings, use the longest sheets you can lift safely, ideally with a drywall lift.
Converting area to sheets
Sheets = total area × (1 + waste) ÷ sheet area, rounded up. A 12 × 14 ft room with 8 ft walls has 416 sq ft of wall and 168 sq ft of ceiling, 584 sq ft in total. With 10% waste and 4 × 12 ft sheets: 584 × 1.10 ÷ 48 = 13.4 → 14 sheets. In metric, a 4 × 3.5 m room with 2.4 m walls has 36 m² of wall and 14 m² of ceiling; with 10% waste and 2400 × 1200 sheets: 50 × 1.10 ÷ 2.88 = 19.1 → 20 sheets.
Specialty boards
| Board | Typical use | Notes |
|---|---|---|
| Moisture-resistant | Bathrooms, kitchens, utility rooms | Not a waterproof shower backer |
| Fire-rated (Type X / fire board) | Garage–house walls, ceilings under rooms, escape routes | Assembly must match a tested specification |
| Acoustic / sound board | Bedrooms, home cinemas, party walls | Denser and heavier |
| Impact-resistant | Hallways, schools, rental properties | Harder face, heavier |
| Thermal laminate | Insulating external walls (UK) | Board bonded to insulation |
| Cement board / tile backer | Shower walls and floors under tile | Not a drywall product, but sized similarly |
Transport and handling
Measure doors, stair turns and the vehicle before choosing the longest sheets. A 12 ft sheet may not turn a tight stair landing, and 3 m boards do not fit in most cars. Many suppliers deliver and some will carry sheets to the room for a fee. Store boards flat on a dry floor, never on edge for long periods, and keep them away from damp; wet board sags and loses strength.
Lifting is the hardest part of the job. Two people should carry long sheets, and a drywall lift or deadman brace makes ceilings safe for a small team. Plan the order of work so that ceiling sheets are hung first and wall sheets press up against them.
Choosing orientation to reduce joints
On walls up to about 8 ft 1 in (2.47 m), two 4 ft sheets hung horizontally cover the height exactly, leaving one long horizontal joint at a comfortable working height. On 9 ft walls, 54 in-wide sheets exist in North America for the same purpose. In the UK and Australia, boards are more often hung vertically, with the tapered edges on studs, and ceiling heights of 2.4 m match the standard 2400 mm board length. Either way, try to avoid butt joints (non-tapered ends) in the middle of a wall; they are harder to hide.
Fixings and finishing quantities
Screw count follows board area and fixing centers: roughly one screw per square foot (about 10–11 per m²) for walls at typical spacing, more on ceilings. Joint compound and tape follow the length of joints, which is why larger sheets save material as well as time. Our drywall calculator estimates sheets, compound, tape and screws together from the same room dimensions, in both US and metric sheet sizes.
Fixing differences
In North America boards are screwed to studs at 16 or 24 in centers and joints are taped and finished with joint compound. In the UK, boards are often fixed to timber or metal studs at 400 or 600 mm centers, or "dot and dabbed" to masonry with adhesive, and then either taped and jointed or skimmed with a thin coat of plaster. Australian practice uses stud adhesive plus screws. The finishing method changes how much compound or plaster you need.
Calculators for this guide
- Drywall Calculator — Count drywall or plasterboard sheets for walls and ceilings, plus joint compound, tape and screws. 4×8, 4×12 and 1200×2400 mm.
- Paint Calculator — Work out gallons or liters of paint for a room, with doors, windows, coats, ceiling and primer — plus the tin sizes to buy.
- Square Footage Calculator — Find the area of a room or yard in square feet, square meters and square yards — rectangles, triangles, circles and trapezoids.
More guides
Estimates only. This guide explains general methods. Verify quantities with your supplier and follow local building codes; for structural or safety-critical work consult a licensed professional. Editorial policy · Report an error.