Drywall Calculator
Sheets, optional screws, and rough cost.
Drywall / Plasterboard / Gyprock Calculator
Estimate how many wall sheets to buy from wall size, sheet size, wall count, waste allowance, and simple layout orientation. Optional opening deductions and screw-pack fields add extra guidance without blocking the core sheet answer.
Drywall Inputs
Drywall planning guide
Drywall, plasterboard, and gyprock estimates need both sheet area and installation context. Sheet orientation, ceiling height, openings, butt joints, waste, screw spacing, and finish level all affect what you need to buy.
Use this calculator to estimate sheets and supporting materials for walls or ceilings before you price a job. For better accuracy, measure each wall group separately and subtract only large openings that will not be sheeted.
What to confirm
- Choose sheet length to reduce joints where possible.
- Increase waste for small rooms, closets, angled ceilings, and many openings.
- Use moisture, fire, acoustic, or impact-rated board where the room requires it.
- Check screw, tape, compound, bead, and primer needs as separate finish materials.
The result is a planning estimate. Fire separation, wet-area lining, ceiling fixing, and rated wall systems should be checked against the relevant product system.
Worked example
A 4 m wide by 2.4 m high wall has 9.6 m² of surface. A 1.2 m by 2.4 m sheet covers 2.88 m², so the clean area calculation is 3.34 sheets and rounds to 4. A 10% allowance brings the purchase estimate to 5 sheets after rounding. Door openings, sheet direction, and joint layout should be checked separately.
Drywall calculator FAQ
Why does layout orientation matter?
Orientation changes which sheet dimension spans the wall height versus the wall length, which changes the layout-based sheet count.
Can I deduct doors and windows separately?
This page uses one optional combined opening-area field. Add the areas that will not be sheeted, then check the result against the actual sheet layout.