Square Footage Calculator

Square Footage Calculator-Use our free Square Footage Calculator to calculate square feet for rooms, floors, walls, yards, and other spaces. Find area from length and width and convert square feet to other units.Explore our collection of conversion calculators and All Online Calculators useful everyday calculation tools.

A Square Footage Calculator helps you quickly find the area of a room, floor, wall, yard, or any other space.

You only need to enter the length and width of the area. The calculator can then tell you how many square feet (sq ft or ft²) the space contains.

Square footage is commonly used when planning:

• Flooring
• Carpet
• Tiles
• Paint
• Home renovations

• Room sizes
• Construction projects
• Landscaping
• Real estate
• Material costs

For a simple rectangular area, the calculation is easy:

Square Feet = Length × Width

For example, a room that is 12 feet long and 10 feet wide has:

12 × 10 = 120 square feet

What Is Square Footage?

Square footage is a measurement of area.

It tells you how much two-dimensional space is covered by a surface.

If a space is:

10 feet × 10 feet

its area is:

100 square feet

Square footage is written as:

sq ft

or:

ft²

Both mean square feet.

Square Footage Formula

For a rectangular or square area:

Area = Length × Width

If both measurements are in feet:

Square Footage = Length in feet × Width in feet

Example

Length:

20 ft

Width:

15 ft

Calculation:

20 × 15 = 300 sq ft

So the area is:

300 square feet

How to Calculate Square Footage

Calculating square footage is usually straightforward.

Step 1: Measure the Length

Measure the longest side of the area in feet.

Step 2: Measure the Width

Measure the other side in feet.

Step 3: Multiply

Use:

Length × Width

Step 4: Add Extra Areas

If the space has multiple sections, calculate each section separately and add the results.

Square Footage Example

Suppose you have a bedroom that measures:

14 feet long

and:

12 feet wide

Square footage:

14 × 12 = 168 sq ft

The bedroom has:

168 square feet

of floor area.

Square Footage Calculator for a Room

A room is often rectangular, making the calculation simple.

For example:

Length = 16 ft

Width = 12 ft

Then:

16 × 12 = 192 sq ft

So the room’s floor area is:

192 square feet

This calculation can help when estimating how much flooring, carpet, or other material you may need.

Square Footage Calculator for Flooring

Square footage is commonly needed when buying flooring.

First calculate the floor area.

For example:

Room length = 15 ft

Room width = 12 ft

Area:

15 × 12 = 180 sq ft

If the flooring manufacturer recommends adding 10% extra for cuts and waste:

180 × 1.10 = 198 sq ft

You may therefore want to purchase about 198 square feet of flooring, subject to the product’s installation requirements.

Square Footage With Waste

When buying flooring, tile, carpet, or similar materials, ordering exactly the calculated area may not be enough.

Extra material can be needed because of:

• Cutting
• Corners
• Pattern matching
• Damaged pieces
• Installation mistakes
• Future repairs

A common planning allowance is around 5% to 15%, depending on the material and layout.

For example:

Area:

500 sq ft

With 10% extra:

500 × 1.10 = 550 sq ft

Always follow the manufacturer’s or installer’s recommendation.

Square Footage Calculator for Carpet

To estimate carpet requirements:

Room Area = Length × Width

For example:

20 ft × 12 ft = 240 sq ft

The actual amount of carpet required can be different from the room’s exact floor area because carpet comes in specific roll widths and installation may require seams.

For an accurate order, consider the room layout and carpet roll width rather than relying only on square footage.

Square Footage Calculator for Tiles

For a rectangular floor:

Length × Width = Floor Area

Example:

10 ft × 15 ft = 150 sq ft

If tiles are sold by square foot, you can compare the required area with the coverage listed on the tile packaging.

If tiles are sold by the box, check how many square feet each box covers.

Square Footage Calculator for Paint

Square footage can also help estimate the area of walls.

For one rectangular wall:

Wall Area = Wall Length × Wall Height

For example:

Wall length = 15 ft

Wall height = 8 ft

Wall area:

15 × 8 = 120 sq ft

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

Then subtract large openings such as doors and windows if you want a more precise estimate.

Paint coverage also depends on:

• Number of coats
• Surface condition
• Paint type
• Application method
• Primer
• Manufacturer coverage

So wall square footage is only the starting point for a paint estimate.

Square Footage of Multiple Rooms

If a house has several rectangular rooms, calculate each room separately.

Example:

Living room: 300 sq ft

Bedroom: 150 sq ft

Kitchen: 120 sq ft

Hallway: 80 sq ft

Total:

300 + 150 + 120 + 80 = 650 sq ft

The total area is:

650 square feet

This method is useful when estimating flooring or other materials for an entire property.

Square Footage of an Irregular Room

Not every room is a perfect rectangle.

An L-shaped or irregular room can usually be divided into smaller rectangles.

For example:

Section A

10 ft × 12 ft = 120 sq ft

Section B

6 ft × 8 ft = 48 sq ft

Total:

120 + 48 = 168 sq ft

Breaking a complicated shape into smaller sections makes the calculation easier.

Square Footage of a Triangle

For a triangular area, use:

Area = ½ × Base × Height

Example:

Base:

20 ft

Height:

10 ft

Area:

½ × 20 × 10 = 100 sq ft

So the triangle has:

100 square feet

Square Footage of a Circle

For a circular area:

Area = π × r²

where r is the radius.

If the radius is:

10 ft

then:

Area = π × 10²

≈ 314.16 sq ft

If you know the diameter instead, first divide it by 2 to get the radius.

Square Footage of a Semicircle

A semicircle has half the area of a full circle.

Formula:

Area = ½ × π × r²

For example, if the radius is:

10 ft

then:

½ × π × 10²

≈ 157.08 sq ft

Square Footage From Inches

If your measurements are in inches, convert them to feet first.

For example:

120 inches = 10 feet

96 inches = 8 feet

Area:

10 × 8 = 80 sq ft

You can also calculate directly in square inches and then convert.

Square Inches to Square Feet

There are:

144 square inches in 1 square foot

because:

12 × 12 = 144

Therefore:

Square Feet = Square Inches ÷ 144

For example:

1,440 square inches ÷ 144 = 10 sq ft

Square Feet to Square Meters

A common conversion is:

1 square foot = 0.092903 square meters

Therefore:

100 sq ft ≈ 9.2903 m²

To convert square feet to square meters:

Square Meters = Square Feet × 0.092903

Square Meters to Square Feet

To convert square meters to square feet:

Square Feet = Square Meters × 10.7639

For example:

20 m² × 10.7639 ≈ 215.28 sq ft

So:

20 square meters ≈ 215.28 square feet

Square Feet to Acres

An acre is a larger unit of area.

1 acre = 43,560 square feet

Therefore:

43,560 sq ft = 1 acre

To convert square feet to acres:

Acres = Square Feet ÷ 43,560

For example:

87,120 sq ft ÷ 43,560 = 2 acres

Square Feet to Square Yards

There are:

9 square feet = 1 square yard

Therefore:

Square Yards = Square Feet ÷ 9

Example:

900 sq ft ÷ 9 = 100 sq yd

Square Feet to Hectares

One hectare contains approximately:

107,639.1 square feet

Therefore:

Square Feet ÷ 107,639.1 = Hectares

For example:

107,639.1 sq ft ≈ 1 hectare

Square Footage and Construction Costs

Square footage is often used for rough construction cost estimates.

For example, suppose:

Area = 1,500 sq ft

and an estimated construction cost is:

$200 per sq ft

Then:

1,500 × $200 = $300,000

This is only a simple estimate. Actual construction costs can vary significantly based on location, labor, materials, design, finishes, permits, site conditions, and project specifications.

Cost Per Square Foot Calculator

If you know the total project cost and total area:

Cost Per Square Foot = Total Cost ÷ Total Area

Example:

Total cost:

$250,000

Area:

2,000 sq ft

Cost per square foot:

$250,000 ÷ 2,000 = $125/sq ft

Square Footage and Real Estate

Property listings often use square footage to describe the size of a home, apartment, office, or commercial property.

For example:

1,800 sq ft home

means the reported area is 1,800 square feet.

However, property measurement standards can differ. Listed square footage may depend on the property type and the measurement rules used by the relevant market or professional.

Square Footage for a Backyard

A rectangular backyard can be calculated the same way as a room.

For example:

Backyard length = 40 ft

Backyard width = 30 ft

Area:

40 × 30 = 1,200 sq ft

This can help when estimating:

• Grass seed
• Sod
• Landscaping materials
• Patio materials
• Outdoor flooring
• Irrigation coverage

Square Footage for a Patio

For a rectangular patio:

Length × Width = Area

Example:

18 ft × 12 ft

= 216 sq ft

If you are buying pavers or tiles, consider adding an appropriate amount of extra material for cuts and breakage.

Square Footage for a Wall

For a rectangular wall:

Wall Area = Length × Height

If a wall is:

20 ft wide

and:

8 ft high

then:

20 × 8 = 160 sq ft

For several walls, calculate each one and add them together.

Doors and windows can be subtracted when a more precise surface-area estimate is needed.

Square Footage for a Ceiling

For a flat rectangular ceiling, the area is usually the same as the floor area.

If the room is:

15 ft × 12 ft

then:

15 × 12 = 180 sq ft

The ceiling area is approximately:

180 sq ft

Square Footage vs Linear Feet

These measurements are different.

Linear Feet

Measures length only.

Square Feet

Measures area.

For example, a wall that is:

20 linear feet long

and:

8 feet high

has:

20 × 8 = 160 square feet

So linear feet alone is not enough to determine square footage unless the required width or height is also known.

Square Footage vs Cubic Feet

Square feet measure area.

Cubic feet measure volume.

For example:

A floor measuring:

10 ft × 10 ft

has:

100 sq ft

If the same space is 8 feet high, its volume is:

10 × 10 × 8 = 800 cubic feet

Use square footage for surfaces and cubic footage for three-dimensional space.

How Accurate Should Your Measurements Be?

The accuracy of the final square footage depends on the measurements.

For a small room, measuring to the nearest inch may be enough for a basic estimate.

For construction or material ordering, more accurate measurements may be necessary.

When purchasing expensive materials, verify measurements before placing the final order.

Square Footage Calculator Tips

Measure Twice

Double-check your length and width before calculating.

Use the Same Units

If length is in feet, width should also be in feet.

Break Large Areas Into Sections

For irregular spaces, divide the area into smaller rectangles.

Add Material Waste

For flooring and tiles, include an appropriate waste allowance.

Keep Extra Digits

Avoid rounding too early during calculations.

Check Product Coverage

When buying materials, check the manufacturer’s coverage information.

Confirm Property Measurements

For real estate or legal purposes, use the measurement standard required in your area.

Common Square Footage Mistakes

Multiplying the Wrong Measurements

For floor area, use the floor’s length and width—not height.

Mixing Feet and Inches

Convert all measurements to the same unit before calculating.

Forgetting Irregular Sections

An L-shaped room cannot always be calculated accurately using only its maximum length and maximum width.

Confusing Square Feet With Linear Feet

Square feet measure area, while linear feet measure length.

Forgetting Waste

Buying exactly the calculated floor area may not provide enough material.

Confusing Area With Volume

Square feet are not the same as cubic feet.

How to Use the Square Footage Calculator

Step 1: Choose the Shape

Select the appropriate shape, such as:

• Rectangle
• Square
• Triangle
• Circle
• Irregular area

Step 2: Enter Measurements

Enter the required dimensions.

For a rectangle, enter:

Length

and:

Width

Step 3: Select Units

Choose feet, inches, meters, or another supported unit.

Step 4: Calculate

The calculator determines the area.

Step 5: Add Waste if Needed

If you are estimating material requirements, enter an appropriate waste percentage.

Frequently Asked Questions

What is a Square Footage Calculator?

A Square Footage Calculator calculates the area of a space in square feet using measurements such as length and width.

How do I calculate square footage?

For a rectangular area:

Square Feet = Length × Width

How many square feet is a 10 × 10 room?

A 10 ft × 10 ft room is:

100 sq ft

How many square feet is a 12 × 12 room?

12 × 12 = 144 sq ft

So the area is:

144 square feet

How many square feet is a 10 × 20 room?

10 × 20 = 200 sq ft

How many square feet are in an acre?

43,560 square feet

How many square feet are in a square yard?

9 square feet

How many square feet are in a square meter?

Approximately:

10.7639 square feet

How many square meters are in 1 square foot?

Approximately:

0.092903 square meters

How do I calculate square footage of an irregular room?

Divide the room into smaller shapes, calculate each area, and add them together.

How do I calculate wall square footage?

Multiply:

Wall Length × Wall Height

Then subtract doors and windows if appropriate.

How do I calculate flooring square footage?

Multiply the floor’s length by its width. For irregular floors, divide them into smaller sections and add the areas.

How much extra flooring should I buy?

A common planning allowance is around 5% to 15%, depending on the material and installation pattern. Follow the manufacturer’s recommendation when available.

Is square footage the same as square feet?

Yes. Square footage describes an area measured in square feet (ft² or sq ft).

What is the difference between square feet and cubic feet?

Square feet measure area. Cubic feet measure volume.

Can I calculate square footage in meters?

Yes. You can calculate the area in square meters and convert it to square feet.

Is the Square Footage Calculator free?

Yes. The CalculatorGuides.com Square Footage Calculator is free to use.

Square Footage Calculator – Quick Reference

Calculation	Formula
Rectangle	Length × Width
Triangle	½ × Base × Height
Circle	π × Radius²
Square	Side × Side
Square Inches → Square Feet	÷ 144
Square Feet → Square Meters	× 0.092903
Square Meters → Square Feet	× 10.7639
Square Feet → Square Yards	÷ 9
Square Feet → Acres	÷ 43,560
Cost per Sq Ft	Total Cost ÷ Area

Conclusion

The Square Footage Calculator makes it easy to find the area of rooms, floors, walls, patios, yards, and other spaces.

For a simple rectangular area, remember:

Square Feet = Length × Width

For example:

15 ft × 12 ft = 180 sq ft

For irregular spaces, divide the area into smaller sections and add the results together. If you are estimating flooring, tiles, carpet, or other materials, remember to include an appropriate amount of extra material for cuts and waste.

You can also convert square footage into square meters, square yards, acres, and other area units.

Use the CalculatorGuides.com Square Footage Calculator to calculate area quickly, check measurements, estimate material requirements, and make everyday home and construction calculations easier.