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Easily calculate drywall sheets needed for walls or ceilings with our free online gypsum board calculator. Fast, accurate, and perfect for any project.
Planning a drywall project and unsure how many gypsum boards you need? Our Gypsum Board Calculator makes it incredibly simple to estimate how many drywall sheets are required for your walls or ceiling whether it’s for a single room or a full house. Designed for homeowners, DIYers, and professionals alike, this tool offers a user-friendly experience with 100% accurate results.
A gypsum board calculator, also known as a drywall calculator, is an online tool used to estimate the number of drywall sheets required based on the dimensions of your wall or ceiling. It helps you avoid material shortages and overspending by calculating the net wall area, deducting door and window openings, and adding waste percentage.
Whether you're covering a wall, ceiling, or both, this calculator provides an instant and accurate gypsum board estimate. It even allows you to choose standard board sizes or enter your custom dimensions.
The formula to calculate gypsum board is simple:
Total Wall or Ceiling Area = Length × Height or Width
Opening Area = (Opening Length × Opening Height) × Quantity
Net Area = Total Area – Opening Area
Board Area = Length × Width of one gypsum board
Boards Required = Net Area ÷ Board Area
Boards with Waste = Boards Required + Waste Percentage
Let’s say you're drywalling a wall that's 20 feet long and 10 feet high:
Total Wall Area = 20 × 10 = 200 sq ft
Board Area (4x8 ft) = 4 × 8 = 32 sq ft
Boards Required = 200 ÷ 32 = 6.25 → round up to 7
Boards with 10% waste = 7 + 0.7 ≈ 8 boards
So, you would need 8 sheets of drywall for that wall.
Using the calculator is simple and takes just a few steps:
Enter the length and width (or height) of the area you want to cover. You can choose your preferred units such as feet, meters, inches, or centimeters.
Select a standard board size like 4x8 ft or enter your custom board size in meters or feet.
Choose the thickness (like 1/2 inch or 12.7 mm) depending on your structural and soundproofing requirements.
Add an extra percentage for waste, typically 10–15%, to cover cutting errors and breakage.
If your wall or ceiling has windows, doors, or skylights, enter the dimensions and quantity to subtract their area from the calculation.
The tool will instantly show you:
If you're working on drywall installation for a new home, remodeling project, or even just updating a ceiling, using a gypsum board calculator is the smartest way to plan. It not only saves you time and money but also ensures that you buy just the right amount of material.
Our tool is designed to offer high accuracy, fast results, and ease of use making it perfect for both professionals and DIY users.
So, before heading to the hardware store or Home Depot, run your measurements through our gypsum board calculator and get peace of mind knowing exactly how much you need.
Measure the length and width of your ceiling. Multiply them to get the ceiling area. Divide this by the board size area to find the number of sheets needed.
Assuming 2000 sq ft includes all wall and ceiling surfaces, and each 4x8 sheet covers 32 sq ft:
2000 ÷ 32 = 62.5 → round up = 63 boards (plus 10% waste = 69 boards)
On average, you need 1 roll of tape (250 ft) for every 10 sheets.
100 sheets ÷ 10 = 10 rolls of drywall tape
Yes. Simply input the right dimensions for walls or ceilings. The tool supports both.
Absolutely. Our drywall calculator is 100% free to use with unlimited calculations.