ToolsWebBeta

Square Footage Calculator

Use our Square Footage Calculator to find area and perimeter for rooms and shapes. Get fast, accurate results for construction, flooring, painting, and material estimates.
Area
100 sq ft
Area (number)

100

Perimeter

40 ft

Recent
Nothing here yetYour recent activity will appear here

What is a Square Foot?

A square foot measures area in a 1-foot by 1-foot space. It helps civil engineers and builders measure rooms, floors, land, and building areas for clear estimates, material planning, and construction work. One square foot equals 144 square inches.

Square footage calculator for measuring rooms, floors, land areas, material planning, and construction projects.

How can you use our Square Footage Calculator?

Our Square Footage Calculator quickly calculates area and perimeter for different shapes.

Step 1

Select a Shape

Choose Rectangle, Circle, Triangle, or L Shape.

Step 2

Enter Your Measurements

Enter the required dimensions into the calculator.

Step 3

View Your Results

Get the area and perimeter instantly.

Step 4

Copy Your Result

Copy the calculated results for future use.

How you can calculate square footage manually?

To calculate square footage, measure the length and width in feet, then multiply them.

Formula: Area=Length×WidthArea = Length \times Width

Step by step guide:

  1. Measure the length of the space in feet.
  2. Measure the width in feet.
  3. Multiply length by width.
  4. Record the answer in square feet.

Practical Example: A room is 12 feet long and 10 feet wide. 12×10=12012 \times 10 = 120 square feet. For an irregular room, divide it into simple shapes. Calculate each area, then add the results. Keep units consistent.

Square Footage Formulas for Different Shapes

Different shapes need different area formulas. Choose the formula that matches your measured shape. Keep all measurements in the same unit before calculating square feet.

Common formulas:

Square: Area=Side×SideArea = Side \times Side

Rectangle: Area=Length×WidthArea = Length \times Width

Triangle: Area=(Base×Height)÷2Area = (Base \times Height) \div 2

Circle: Area=π×Radius2Area = \pi \times Radius^2

Trapezoid: Area=((Base1+Base2)×Height)÷2Area = ((Base1 + Base2) \times Height) \div 2

Ring: Area=π×(OuterRadius2−InnerRadius2)Area = \pi \times (Outer Radius^2 - Inner Radius^2)

For a complex floor plan, split the area into simple shapes. Calculate each part, then add the results.

How do you calculate Cost Per Square Foot

Estimate cost per square foot for flooring, paint, tile, and construction projects using your total area and project cost clearly.

Painting a house

For painting, use wall area rather than floor area. Subtract large openings, then divide paintable area by coverage per gallon to estimate paint needs.

Wood Flooring

Estimate wood flooring from floor area, then add waste for cuts. Use the final square footage to estimate boards, materials, and installation cost.

Laminate Flooring

For laminate flooring, calculate floor area first. Add extra material for cutting waste, then multiply the final area by the price per square foot.

Tile flooring

Calculate tile area from floor or wall dimensions. Add extra tiles for cuts and breakage before multiplying the final area by the tile price.

Building a home

For a home, calculate each floor's measured area, then add the floors together. Use the total square footage to estimate materials and building costs.

Explore Construction Calculators

Use construction calculators for materials, measurements, area, volume, and project planning.

Frequently Asked Questions

Find clear answers about irregular rooms, square feet, flooring waste, garages, house size, closets, and 12×12 rooms.