Calculadora de Drywall
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
placas = ceil(área × 1,1 / 2,88); placa padrão 1,2×2,4 m
About this calculator
The Drywall Calculator helps estimate the number of standard drywall boards needed to cover a given area. The calculation uses boards measuring 1.2 × 2.4 meters (2.88 m² each) and adds a 10% waste factor to account for cuts and waste during installation. The result is rounded up to ensure you purchase enough whole boards.
To use the tool, simply enter the total area to be covered (in square meters). The system applies the formula: area × 1.1 (waste factor) divided by 2.88 (board area). The final number is the required boards, including the safety margin. This calculator is ideal for construction professionals, architects, and homeowners planning renovations or drywall installations.
Drywall is widely used for interior walls, ceilings, and partitions due to its quick installation and good finish. However, the calculation does not include metal studs, screws, joint tape, or compound, which must be sized separately. Also, check the actual board dimensions available locally, as variations may occur.
Cautions: the area entered should be the sum of all surfaces to be covered, subtracting openings like doors and windows. The 10% waste factor is standard, but complex projects with many cuts may require a higher margin. Always buy an extra board for unforeseen issues and check the manufacturer's specifications for thickness and board type (moisture-resistant, fire-rated, etc.).
Frequently asked questions
How do I correctly calculate the area for drywall?
Measure the height and width of each wall or surface, multiply to get the area in m², and add them all up. Subtract the areas of doors and windows by measuring them and deducting from the total.
Does the calculator account for waste?
Yes, it automatically adds a 10% waste factor to the total area to compensate for cuts and waste. The result is already rounded up.
Can I use other board sizes?
This calculator uses the standard size of 1.2 × 2.4 m. If your boards are different, the calculation will not be accurate. Consult a professional for alternative dimensions.
Does the calculator include studs and screws?
No, it only calculates the number of boards. For metal studs, screws, tape, and joint compound, specific sizing based on the project is required.
What if I have leftover boards?
Extra boards can be stored for future repairs. Avoid returning cut boards as they are usually not accepted. Plan carefully to minimize leftovers.