To determine how much drywall you need for a 400 square foot area, you’ll need to consider the height of the walls and whether you’re covering both walls and ceilings. Drywall typically comes in 4×8, 4×9, 4×10 or 4×12-foot sheets.

Determine the size of the drywall sheets you plan to use (4×8, 4×9, 4×10 or 4×12 feet). Divide the total square footage by the square footage of a single sheet to find out how many sheets you need.

Calculate how many drywall sheets you will need by dividing the total square footage of area by 32 (if you’re using 4-by-8 sheets), by 36 (if you’re using 4-by-9 sheets), by 40 (if you’re using 4-by-10 sheets), or by 48 (if you’re using 4-by-12 sheets).

For 4×8-foot sheets: 400 square feet / (4×8) square feet = 12.5 sheets. For 4×9-foot sheets: 400 square feet / (4×9) square feet = 11.11 sheets. For 4×10-foot sheets: 400 square feet / (4×10) square feet = 10 sheets. For 4×12-foot sheets: 400 square feet / (4×12) square feet = 8.33 sheets

Round up to the nearest whole sheet since you can’t buy a fraction of a sheet. So, you would need approximately 13 sheets of 4×8-foot drywall, 12 sheets of 4×9-foot drywall, 10 sheets of 4×10-foot drywall or 9 sheets of 4×12-foot drywall to cover a 400 square foot area with 8-foot high walls and ceilings. Make sure to account for waste and extra sheets for cuts and mistakes when purchasing.

In US, Canada, UK and many European countries of cold region, construction of wooden frame house is most popular. In wooden frame house construction one of the most important finishing material used is drywall construction to face the interior walls of dwellings and other buildings. Others materials used are Wall studs, joist, rafter, header, bottom plate, top plate, siding and roof. Drywall construction is the application of wall without the use of cement mortar or rendering.

Drywall is also called as gypsum board, plasterboard, dry lining, wallboard, sheet rock, buster board, custard board, and gypsum panel which is made from gypsum panel sheets of calcium sulfate dihydrate, with or without additives, comes in large rigid sheets used in the construction of interior walls and ceiling.

Drywall is a construction material used to create finishing of walls and ceilings. It replace the use of cement, mortar and bricks. It is sound proof, corrosion resistant, durable, fire free gypsum panel sheet. It is also used to create many design features, including eaves, arches and other architectural specialties. It’s quick and easy to install, incredibly durable, and requires only simple repairs when damaged.

In this article article we know about how much drywall do i need for 400 square feet. There are many size of drywall like a 4 ft by 8 ft (4×8) sheet has area of 32 square feet, a 4 ft by 10 ft (4×10) sheet has area of 40 square feet, a 4 ft by 12 ft (4×12) sheet has area of 48 square feet, a 4 ft by 14 ft (4×14) sheet has area of 56 square feet, or a 4 ft by 16 ft (4×16) sheet has area of 64 square feet.

Drywall comes in many vary thickness and sizes for different projects. It is generally 4 feet (48″) wide and 8, 10, 12, 14, or 16 feet long. Their thickness are, 1/4″, 3/8″, 1/2″, or 5/8″. But standard and most common size of drywall is 4 feet wide and 8 feet in length of 1/2″ thick used for majority of residential building.

1/4″ thick drywall is ideal for creating curved wall or creating new surfaces over plaster. It is economical option for you. 3/8″ thickness of drywall is perfect for remodeling of partition wall and this can be also used for where the plaster has worn off. 1/2″ thickness of drywall is standard thickness to create walls and ceiling. 5/8″ thickness of drywall used for commercial application where soundproofing is necessary, it is also refers as firewall drywall.

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**How much drywall do i need for 400 square feet**

To calculate how much drywall panels or sheets/boards do you need for 400 square feet, you simply dividing the total square footage of project i.e 400 sq ft by 32 (if you’re using 4×8 sheets) or by 48 (if you’re using 4×12 sheets), or by 40 (if you’re using 4×10 sheets).

To calculate number of 4×8 sheets, divide 400 sq ft by 32, i.e. 400 ÷ 32 = 12.5 sheets (13 whole sheets), add 10% of 13, i.e. 13 + 2 = 15 sheets. This is total amount of 4 by 8 sheets required for construction of 400 square footage of walls and ceiling area.

To calculate number of 4×10 sheets, divide 400 sq ft by 40, i.e. 400 ÷ 40 = 10 sheets, add 10% of 10 , i.e. 10 + 1 = 11 sheets. This is total amount of 4 by 10 sheets required for construction of 400 square footage of walls and ceiling area.

To calculate number of 4×12 sheets, divide 400 sq ft by 48, i.e. 400 ÷ 48 = 8.4 sheets (9 whole sheets), add 10% of 9, i.e. 9 + 1 = 10 sheets. This is total amount of 4 by 12 sheets required for construction of 400 square footage of walls and ceiling area.

For 400 square feet construction of walls and ceiling, you would need 15 sheets/ panels or boards of drywall if you’re using 4×8 sheets, 10 sheets of drywall when you are using 4×12 sheets, or 11 sheets of drywall if you’re using 4×10 sheets.

**How many 4×8 sheets do i need for 400 square feet**

You would need 15 pieces of 4×8 sheets/ panels/ boards of drywall for 400 square feet. A 4 by 8 sheets of drywall has 4’×8′ = 32 square feet. Divide total square footage i.e. 400 by 32 = 12.5 nos sheets ( in whole 13 sheets), add 10% of 13, i.e 13 + 2 = 15 sheets. This is total required amount of 4 by 8 sheets of drywall for construction of 400 sq ft of walls and ceiling area.

**How many 4×10 sheets do i need for 400 square feet**

You would need 11 pieces of 4×10 sheets/ panels/ boards of drywall for 400 square feet. A 4 by 10 sheets of drywall has 4’×10′ = 40 square feet. Divide total square footage i.e. 400 by 40 = 10 nos sheets, add 10% of 10, i.e 10 + 1 = 11 sheets. This is total required amount of 4 by 10 sheets of drywall for construction of 400 sq ft of walls and ceiling area.

**How many 4×12 sheets do i need for 400 square feet**

You would need 10 pieces of 4×12 sheets/ panels/ boards of drywall for 400 square feet. A 4 by 12 sheets of drywall has 4’×12′ = 48 square feet. Divide total square footage i.e. 400 by 48 = 8.4 nos sheets ( in whole 9 sheets), add 10% of 9, i.e 9 + 1 = 10 sheets. This is total required amount of 4 by 12 sheets of drywall for construction of 400 sq ft of walls and ceiling area.

**How many sheets of drywall do I need for 400 square feet?**

You would need either 15 pieces of 4×8, or 10 pieces of 4×12, or 11 pieces of 4×10 sheets/ panels/ board of drywall for construction of 400 square feet of walls and ceiling area.

**How much does it cost to install 400 square feet drywall**

The typical cost to install 400 square feet drywall to construct walls and ceiling ranges between $1,500 to $3,500, and on average $2,000. This cost includes labour and materials cost.

The typical installation cost for drywall ranges between $1.5 to $3.5 per square foot, so, it would cost to install 400 square feet drywall is range between $1.5× 400 = $600 or $3.5× 400 = $1,400. This installation cost of 400 square feet drywall includes cost of materials and labour.

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**Conclusion:**

You would need either 15 pieces of 4×8, or 10 pieces of 4×12, or 11 pieces of 4×10 sheets/ panels/ board of drywall for construction of 400 square feet of walls and ceiling area.