# How to Calculate Square Footage

Determine the square footage of an area by plugging in the width and height in feet into our square footage calculator. You can also use the square footage formula below for manual calculations.

## Square Footage Calculator

Enter the length and width of the rectangle or square room to calculate the square footage:

To determine square feet measure the length and width of an area in feet and multiply those numbers by each other. Use this calculation for true rectangle and square-shaped areas.

`Square feet = height x width`

View the table below for common square footage calculations.

**TABLE**

## How to Measure Square Footage of a Wall

Whether you’re gearing up to paint or apply wallpaper, knowing a wall’s square footage will ensure you purchase enough product. To find the square footage, measure the height (from floor to ceiling) and length of the wall in feet. Then multiply those numbers.

`Square footage of a wall = length x height`

## How to Calculate Square Footage of a Room

Calculating the square footage of a rectangle or square-shaped room is easy. Start by measuring the length and the width of the room in feet. Then, multiply the length by the width. So, for example, if your room is 12 feet long by 10 feet wide, multiply 12 x 10 for a total of 120 square feet.

The best way to determine the square footage of an odd shape room is to break it down into individual rectangles. For example, if you have an “L” shaped room, divide it into two rectangles. Measure the length and width of your first rectangle and multiply those numbers by each other. Then measure the length and width of the second triangle and multiply those numbers by each other. For the final step, add the square footage of both rectangles together for the total square feet.

## How to Determine Square Footage of a House

There are two ways to determine the square footage of a house. If your home is a perfect square or rectangle, measure the length and width in feet and multiply those numbers by each other. While this number gives you an approximate estimate, it doesn’t account for unlivable space, so it isn’t as precise.

The most precise way to measure the square footage of a home is to find and calculate the square feet of all rooms, hallways, and liveable spaces and add those numbers together.

To find the square footage of a space, measure the width and length and multiply those numbers by each other. Once you’ve determined the square footage of all areas, add those numbers together for the total.

## How to Calculate Square Footage of a Triangle

To figure the square footage of a triangle, measure the base and height in feet. Then use this formula:

`Square footage of a triangle = 0.5 x base x height`

So, if the base of your triangle is 10 feet and the height is 7 feet, the total square footage of the triangle is 35.

## Frequently Asked Questions (FAQ)FAQ

### Can you convert feet to square feet?

The foot is a length measurement, and square footage is a measurement of area. So the only way to go from feet to square feet is to measure width x length. So, for example, if you’re measuring a room that’s 8 feet long and 7 feet wide, it has a square footage of 56 square feet.

### How do you calculate square feet for tile?

To calculate square feet for tile, measure the length and width of the space you’ll be tiling in feet. Then, multiply those numbers to get the total square footage. When you have that number add 10-15% to account for waste.

### How many 12x12 tiles for a 40 square feet area?

A 12-inch by 12-inch tile is equal to one square foot. So, in theory, you would need 40 12 x 12 tiles for a 40-square-foot area. However, it’s advisable to purchase 10-15% more than you need to account for waste. So for a 40 square foot area, consider 44-46 tiles.

### How to determine square feet for carpet?

To measure the square footage for new carpet, measure the length and width of the area in feet. Then, multiply those numbers by each other to determine the square footage. Finally, add an extra 10% to account for waste.