I need plasterboard sheets
One wall or ceiling
Enter dimensions or a known area, deduct large openings, choose the actual board size and set your own cutting allowance.
Walls & Plastering Calculators
Start with what you are trying to order or measure. Use one surface calculator for a simple quantity, a project planner for a whole job, or the guides and reference pages when you need the method or product dimensions first.
PlasterboardPlasterRenderStud wallsFixings
Start here
What are you working out?
Each tool owns one job. That keeps the maths clear and avoids hiding product- or system-specific assumptions inside a catch-all calculator.
Plasterboard calculator
I am boarding a room
Walls, openings and an optional ceiling
Plan a simple rectangular room as one job, with wall area, opening deductions, ceiling area and whole-sheet rounding kept separate.
I need bags of plaster
Known area + your product coverage
Use the coverage stated for the exact plaster you are buying. The calculator rounds the theoretical requirement up to whole bags without inventing a universal coverage rate.
I am rendering a wall
Render volume from area and thickness
Calculate wet volume in litres and cubic metres from the area and total specified thickness. For product/bag planning, use the fuller project estimator.
I am framing a partition
Studs, plates and noggin run
Estimate simple timber framing with editable centres and explicit extra studs. For a wider plasterboard-and-fixings plan, use the full stud wall estimator.
I need plasterboard screws
Sheets + the fixing count for your system
Enter the number of sheets and the fixing count you have established for the actual board/system. Add optional spares and a real pack size if useful.
Before you order
Method, sizes and deeper guidance
Use these when the missing piece is not the arithmetic itself.
How many plasterboard sheets do I need?
Learn the measuring method, opening deductions, board-area calculation and whole-sheet rounding before using the calculator.
Read the quantity guide →UK plasterboard sheet sizes & thicknesses
Compare common current UK board dimensions and area per sheet, with manufacturer examples rather than one claimed universal size.
Open the size reference →Walls & Plastering estimating guides
Browse the wider measurement and material-planning guides when you need explanation beyond a single calculator result.
Browse Walls & Plastering guides →A simple estimating workflow
Measure the right thingUse net surface area for board, plaster or render work; use wall length and height where a framing calculator needs geometry.
Use the exact product or system valueBoard size, plaster coverage, render build-up, stud centres and fixing patterns can all vary. Replace convenience inputs with the real job values.
Round only where buying requires itKeep the theoretical quantity visible, then round boards, bags or packs to whole purchasable units rather than hiding the arithmetic.
These are quantity-planning tools, not construction specifications. For system-dependent details such as board type, fixing centres, timber section, render build-up or product coverage, use the current manufacturer or project specification.
Whole-job planners
Need more than one material?
The focused calculators above answer one quantity question. These planners combine several related checks for a broader job.