large home on landscaped yard showing 400 square feet area

How Big Is 400 Square Feet (With Visual Examples)

In this article, I will show you how big 400 square feet is with some visual examples.

Square feet is also known as square footage and is the measurement of a two-dimensional space known as area.

To calculate the square footage of a certain area, you need to multiply the width and the length together.

For example, if you need to calculate the square footage of a room with the dimensions of 20 feet long and 20 feet wide, the square footage equals 400 square feet.

20 feet long x 20 feet wide = 400 square feet.

As long as you have the length and width dimensions, you can calculate square feet.

To get a better idea of how big 400 square feet really is, here are some examples for you to reference.

Basketball court

If you love the sport of basketball, you will be familiar with the size of the court. A basketball court used in professional leagues like the NBA, has dimensions of 92 feet long and 50 feet wide which equals 4,600 square feet.

Divide 4,600 by 400 and you will see that a basketball court is 11.5 times larger than 400 square feet.

Outdoor Sheds

An outdoor shed can be built in a variety of sizes. A common size shed for your backyard will have the dimensions of 10 feet long and 10 feet wide which equals 100 square feet.

Placing 2 of these sheds together side by side will have dimensions of 20 feet long and 20 feet wide which equals 400 square feet.

These dimensions are for the floor only and do not account for the size of the roof. It’s easy to visualize the size of 400 square feet by picturing 2 sheds together.

pair of 10x10 outdoor wooden sheds

Standard house door

A typical door that you would see in most homes in the USA, have dimensions of 36 inches wide x 80 inches tall. The dimensions in feet are 3 feet wide x 6.66 feet tall which equals 20 square feet. Most people can visualize the size of a standard door.

If you were to place 20 standard sized doors together on the ground, they would equal very close to 400 square feet.

20 wooden house doors side by side to equal 400 square feet

Double car garage

Many homes are built with double car garages and although they can vary in size, it’s common to have dimensions of 20 feet long x 20 feet wide. This equals exactly 400 square feet.

Other double car garages can have dimensions of 20′ x 22′, 24′ x 24′, and 24′ x 30′.

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If you have a 20′ x 20′ double car garage, it is a perfect example of something that equals 400 square feet.

double car garage that equals 400 square feet


Vehicles are a great tool to use for a visual reference of size. Since most people are familiar with the average size of a vehicle, they can be used to compare the size of many things.

For example, an average sedan car is about 15 feet long x 6 feet wide. Of course, compact cars will be smaller and vehicles like pick up trucks and SUV’s will be larger.

On average, a sedan will measure 90 square feet. If you can picture 4 of these cars placed side by side, they will equal 24 feet long x 15 feet wide which is 360 square feet total.

Not quite 400 square feet but it will give you a visual reference.

4 gold colored sedans parked side by side to show 400 square feet

2 x 4 Board

A 2×4 board is one of the most commonly used pieces of lumber for many projects. A 2×4 can be purchased at most hardware stores and lumber mills. A 2×4 can be cut to any size you choose and depending on the project you are working on, you may need to have a variety of sizes pre cut for you.

If you plan on purchasing 2×4 boards and cutting them yourself, you will notice that most of them are available in 8 foot lengths. The actual width of the board is 3.5 inches although it is called a 2×4.

So to get a visual reference of 400 square feet, you could place 170 two by four boards together side by side.

They would equal 595 inches or 49.5 feet wide x 8 feet long.

For round numbers, 170 two by four boards that are 8 feet long would equal 50 feet wide x 8 feet long which equals 400 square feet.


Sods are another great tool to use for measuring as many people will need to place sods to cover a specified area of land.

Although sods can be cut to any dimensions, it’s common for each sod to measure 16″ wide x 24″ long. This is equal to 2.75 square feet per sod.

If you wanted to cover a 400 square foot area of land, you will need around 145 sods.

Depending on where you purchase the sods, the dimensions can vary with some being 18″ wide x 24″ long or 1.5 feet wide x 2 feet long.

If you were to order 1 full pallet of sod with these dimensions, it will cover around 450 square feet of land.

Each sod is equal to 3 square feet and each pallet will contain 150 sods.

pallet of sods which will cover 400 square feet

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