Plasterboard calculator
Building a plasterboard wall? Enter the length and height and the calculator works out exactly how many boards, studs and screws you need – and keeps the board joints landing in the middle of a stud. No over-ordering, no second trip to the merchant.
Plasterboard calculator – the full material list
Enter the wall and we work out plasterboard, studs, plates, insulation and screws. The board width sets the stud spacing (c/c) per Gyproc’s installation manual.
An estimate per Gyproc’s installation manual. The frame is counted once even with double-sided cladding; screws about 20 pcs/m² per layer (edge c200, field c300). Always check board sizes, stud type and fixings against the supplier’s instructions for your wall type.
This tool gives an estimate and is an aid – not a finished calculation. Always check the result against drawings, applicable regulations, supplier data and your professional experience before giving a binding price, ordering material or using the file. ByggExp is not responsible for decisions made solely on the basis of the tool.
Want help taking this further?
Briefly describe what you need and we’ll help you with a quote, material and next steps – free of charge. Only the contact field is required.
How the calculator works
- Plasterboard: wall length × height × number of sides × layers, plus waste, divided by the board area.
- Studs: wall length ÷ c/c + 1. The frame is counted once even when both sides are clad.
- Bottom + top plate: 2 × wall length in linear metres (top and bottom).
- Screws: about 20 pcs per m² and board layer.
- Insulation: the wall area once, since it fills the frame.
Board width sets the stud spacing (c/c)
- Board 1200 mm wide → studs c/c 600 mm.
- Board 900 mm wide → studs c/c 450 mm.
- The joint between two boards must always land in the middle of a stud – that’s why the dimensions are linked.
Layers, screws and insulation
One layer is enough for most interior walls. Two layers give better sound and fire resistance and are sometimes required by the design. Screw more closely at the edges (about c200 mm) than in the field (about c300 mm), and screw the outer layer more closely than the inner. If the wall is to be sound- or heat-insulated, fill the frame with insulation equal to the wall area.
Keep in mind
Add waste for cuts around windows, doors and corners – better to buy a board or two extra. The dimensions here follow Gyproc’s installation manual; always check board and stud type and fixings against the supplier’s instructions for your specific wall type (e.g. wet room, fire- or sound-rated wall).
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Frequently asked questions
- Which c/c spacing should the studs have?
- The board width decides it: a 1200 mm board gives c/c 600 mm, a 900 mm board gives c/c 450 mm. You don’t have to work it out – the calculator sets the right c/c as soon as you pick the board width.
- Is plasterboard counted on both sides of the wall?
- A stud wall is normally clad on both sides. Choose "Both sides" and the board and screw quantities double, while the frame (studs, plates) is counted once – it is shared by both sides.
- How many screws are needed?
- Reckon about 20 screws per m² and board layer – that is the figure the calculator uses. A wall clad on both sides with two layers therefore takes roughly four times as many as a single layer on one side.
- One or two layers of plasterboard?
- For a standard interior wall, a single layer does the job. Add a second when you want to dampen sound or raise the fire rating, or when the drawing calls for it. Set the number of layers per side and boards and screws are recalculated.
- How big is a plasterboard sheet?
- Common sizes are 1200 × 2600 mm (about 3.1 m²) and 900 × 2600 mm (about 2.3 m²). Choose board width and length in the calculator.
- Does it cost anything?
- No, the calculator is free and requires no account.