Drywall Calculator
How to Calculate How Many Drywall Sheets You Need
Drywall (also called plasterboard or gypsum board) is the most common wall finishing material. Getting the right quantity avoids waste and extra trips to the store. Once your drywall is installed and taped, head over to our paint calculator to work out how much paint you need for the finished walls.
The Drywall Calculation Formula
Sheets needed = Wall Area ÷ Sheet Area (rounded up)
Standard sheet: 1200mm × 2400mm = 2.88 m² per sheet.
Step-by-Step Guide
- Measure wall dimensions — Record the total length and height of all walls to be covered.
- Calculate total area — Length × Height for each wall, then sum them.
- Divide by sheet area — Standard sheet covers 2.88 m².
- Round up — Always round up to whole sheets. Drywall can't be spliced.
Materials List for Drywall Installation
| Material | Quantity per m² | Purpose |
|---|---|---|
| Drywall Screws | 8-10 pcs | Fastening to studs |
| Joint Tape | 1.2 m (tape length = joint length) | Reinforcing joints |
| Joint Compound | 1.5 kg | Covering joints and screws |
| Corner Bead | As needed | Protecting outside corners |
Drywall Thickness Guide
| Thickness | Use Case |
|---|---|
| 9.5mm | Ceilings, curved walls, repairs |
| 12.5mm | Standard walls (most common) |
| 15mm | Fire-rated walls, soundproofing |
| Double layer | Maximum fire/sound rating |
Tips for Accurate Estimates
- Subtract large openings only if they're bigger than one sheet
- Order 5-10% extra for cuts and waste
- Plan your layout to minimize joints and waste
- Consider sheet orientation — horizontal installation is standard for walls
- Insulating first? If you are fitting insulation behind the drywall, measure and install it before closing up the wall
When to Hire a Professional
Drywall finishing (mudding and taping) is one of the most skill-intensive renovation tasks. Consider a professional for visible areas, ceiling work, or any Level 4-5 finish quality. If the bottom section of the wall will be tiled instead of painted, use our tile calculator to get the right tile count.
These calculations are estimates only. Actual requirements may vary depending on surface conditions, product specifications, and installation methods. Always consult a qualified professional for precise measurements.
Prices updated: 2026-03Frequently Asked Questions
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