Free Square Footage Calculator

A construction professional using a tablet to measure the square footage of a room.
Square footage is calculated by multiplying the length of a space by its width in feet. Our square footage calculator, lets you calculate the area of different shapes such as rectangles, squares, circles and triangles. You can use it to calculate the area of a room, a roof, a house and much more. You can also calculate the total cost of your project by combining multiple areas, with different shapes and costs.

Billdr Pro Square Footage Calculator

How Is Square Footage Calculated ?

The formula to calculate the square footage depends on the shape of the area. For a rectangle or a square, you simply need to multiply the length and the width. For a circle, you need to multiply pi by the radius squared. If you don't have the radius, you can obtain it by dividing the diameter by two. For Triangles, you need to multiply the base and height and divide the result by two. Here are the formulas :

Area of a Rectangle

A = Length × Width

where Length and Width are the adjacent sides.

Area of a Circle

A = π × r2

where r is the radius.

Area of a Triangle

A = (Base × Height) ⁄ 2

where Base is the base and Height the perpendicular height.

Essential measures to calculate the area of rectangle, circle and triangle.
Essential measures to calculate the area of a rectangle, circle and triangle.

What can you calculate with our square footage calculator ?

You can use it to calculate a lot of different things. You can calculate the total area of a room, a house, a roof, a countertop, a wall and even combine all of these things together for a total. Since you can assign a custom cost for each area/shape with our calculator, you can calculate the total cost of your project.

Frequently Asked Questions

How do I calculate square footage?
Multiply the length of a room or space by its width in feet. For example a room that is 12 feet long and 10 feet wide is 120 square feet.

How many square feet is a 10x10 room?
A 10x10 room is 100 square feet. Multiply length by width to get the total square footage.

How do I calculate square footage for an irregular shape?
Break the space into smaller rectangles, calculate the square footage of each section separately, then add all the totals together.

How many square feet is an average house?
The average North American home is approximately 2,000 square feet. A typical bedroom is 120 to 150 square feet and a standard one-car garage is around 200 square feet.

How do I convert square feet to square meters?
Multiply the square footage by 0.093 to convert to square meters. For example 1,000 square feet equals approximately 93 square meters.

How much does it cost per square foot to renovate?
Renovation costs vary widely by project type. A basic renovation runs approximately 50 to 100 dollars per square foot while a high-end renovation can reach 200 dollars or more per square foot.

Looking for other tools?

Try one of our free Excel templates.

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