Square Foot Calculator

Square Foot Calculator

Need to calculate the square footage of a room, floor, wall, yard, or other space? Use our Square Foot Calculator to find the area quickly and easily.

Enter the length and width of the space, and the calculator will calculate the total area in square feet (sq ft).

You can use it for rooms, homes, flooring, carpets, tiles, walls, lawns, construction projects, and many other everyday measurements.

How to Calculate Square Feet

Calculating square feet is simple when you know the length and width of a space.

For a rectangular or square area, use this formula:

Square Feet = Length × Width

For example, suppose a room is:

• Length: 12 feet

• Width: 10 feet

The calculation is:

12 × 10 = 120 square feet

So, the room has an area of 120 square feet.

You can use our calculator above to do this calculation automatically.

How to Calculate Square Feet of a Room

To calculate the square footage of a room, measure the length and width of the room in feet.

Then multiply the two measurements.

Example:

A bedroom is 15 feet long and 12 feet wide.

15 × 12 = 180 sq ft

The bedroom is 180 square feet.

This method works well for bedrooms, living rooms, kitchens, offices, garages, and other rectangular spaces.

What If the Room Isn’t a Perfect Rectangle?

Some rooms have unusual shapes, such as L-shaped rooms or spaces with corners and extensions.

In that case, divide the space into smaller rectangles.

Calculate the square footage of each section separately, then add the results together.

For example:

Section 1: 10 × 12 = 120 sq ft
Section 2: 6 × 8 = 48 sq ft

Total: 120 + 48 = 168 sq ft

This makes it easier to calculate the area of irregular spaces.

Square Foot Formula

The basic square footage formula for a rectangle or square is:

Area = Length × Width

When both measurements are in feet, the answer is automatically in square feet.

For example:

20 ft × 15 ft = 300 sq ft

So an area measuring 20 feet by 15 feet is 300 square feet.

How to Calculate Square Feet From Measurements

If you already have the measurements, calculating square footage only takes a few seconds.

Step 1: Measure the length

Measure the longest side of the area.

Step 2: Measure the width

Measure the distance across the area.

Step 3: Make sure both measurements use the same unit

If one measurement is in feet and the other is in inches, convert them before multiplying.

Step 4: Multiply length by width

Length × Width = Square Feet

That’s your total area.

Calculate Square Feet From Feet and Inches

Sometimes measurements aren’t given as whole feet.

For example, you might measure a room as:

12 feet 6 inches × 10 feet

Convert 6 inches into feet:

6 inches = 0.5 feet

So the length is:

12.5 feet

Then:

12.5 × 10 = 125 sq ft

The room has 125 square feet of floor area.

How Many Square Feet Is My Room?

To find out how many square feet your room has, measure the room’s length and width and multiply them.

For example:

If your room has a different size, enter your measurements into the calculator above.

Square Foot Calculator for Flooring

Planning to install new flooring?

First, calculate the square footage of the floor. Then you can estimate how much flooring material you’ll need.

For a rectangular room:

Room length × Room width = Floor area

For example:

18 ft × 14 ft = 252 sq ft

The floor area is 252 square feet.

When buying flooring, you may also want to purchase extra material for cutting, fitting, and waste. The amount of extra material you need depends on the type of flooring and the installation pattern.

Square Foot Calculator for Carpet

You can also use the calculator to estimate the area of carpet needed for a room.

Measure the length and width of the area in feet and multiply them.

For example:

16 ft × 12 ft = 192 sq ft

So the room has 192 square feet of floor area.

If you’re ordering carpet, check the supplier’s recommendations for additional material because carpet may need extra material for seams and installation.

Square Foot Calculator for Paint

Square footage can also help when estimating how much wall or ceiling area you need to paint.

For a wall:

Wall length × Wall height = Wall area

For example:

20 ft × 8 ft = 160 sq ft

That wall has 160 square feet of surface area.

For multiple walls, calculate each wall separately and add the areas together.

If the room has doors or windows, you can subtract their areas from the total if you want a more precise estimate of the paintable surface.

Square Foot Calculator for Land or Yard

You can use the same basic calculation for a rectangular yard or other outdoor space.

For example:

50 ft × 40 ft = 2,000 sq ft

So the area is 2,000 square feet.

For irregularly shaped land, divide the area into smaller sections and calculate each section separately.

Calculate Square Feet From Inches

If your measurements are in inches, convert them to feet before calculating square footage.

Since:

12 inches = 1 foot

For example, an area measuring:

120 inches × 60 inches

Convert the measurements:

120 ÷ 12 = 10 feet

60 ÷ 12 = 5 feet

Then:

10 × 5 = 50 sq ft

So the area is 50 square feet.

Square Feet vs. Square Foot

Square foot and square feet refer to the same unit of area.

• 1 square foot = singular

• 100 square feet = plural

The abbreviation is commonly written as sq ft, sq. ft., or ft².

For example:

500 sq ft = 500 square feet

Square Feet Calculator for Different Shapes

The basic length × width formula works for rectangular and square areas.

For other shapes, the calculation may be different.

Square

A square has equal length and width.

Area = Side × Side

Example:

10 × 10 = 100 sq ft

Rectangle

Area = Length × Width

Example:

20 × 15 = 300 sq ft

Triangle

Area = ½ × Base × Height

Example:

½ × 20 × 10 = 100 sq ft

For irregular spaces, dividing the area into simpler shapes can make the calculation easier.

Why Calculate Square Footage?

Knowing the square footage of a space can be useful for many everyday projects, including:

• Buying flooring

• Estimating carpet

• Planning tile

• Painting walls

• Measuring rooms

• Estimating lawn area

• Planning landscaping

• Comparing home sizes

• Estimating construction materials

• Calculating usable space

Frequently Asked Questions

How do I calculate square feet?

For a rectangular or square area, multiply the length by the width.

Square feet = Length × Width

Make sure both measurements are in feet before multiplying.

How do I calculate the square feet of a room?

Measure the room’s length and width in feet, then multiply them.

For example, a 12 ft × 10 ft room is:

12 × 10 = 120 square feet

How many square feet is 10 by 10?

A 10-foot by 10-foot area is 100 square feet.

10 × 10 = 100 sq ft

How many square feet is 12 by 12?

A 12-foot by 12-foot area is 144 square feet.

12 × 12 = 144 sq ft

How do I calculate square feet from inches?

Divide each measurement in inches by 12 to convert it to feet. Then multiply the length by the width.

How do I calculate square feet of an L-shaped room?

Divide the L-shaped room into two or more rectangles. Calculate the square footage of each rectangle and add the results together.

How do I calculate square footage of a wall?

Multiply the wall’s length by its height.

Wall square feet = Length × Height

You can subtract the area of doors and windows if you need a more precise estimate.

How do I calculate square feet for flooring?

Measure the length and width of the floor, then multiply them.

For multiple rooms, calculate each room separately and add the results together.

What is the formula for square feet?

For a rectangle:

Square feet = Length × Width

Both measurements should be in feet.

Is square footage the same as area?

Square footage is a measurement of area specifically expressed in square feet. Other units, such as square meters, can also be used to measure area.

Calculate Square Feet

Whether you’re measuring a room, planning new flooring, estimating carpet, painting a wall, or simply trying to figure out the size of a space, you don’t need to do the math manually.

Enter your length and width above to calculate the square footage instantly.