Square Footage Calculator
Use our free square footage calculator to calculate the square footage of any room, space, or surface. Enter the dimensions of your space and this sq ft calculator gives you the total area in square feet instantly.
What Is a Square Footage Calculator?
A square footage calculator is an online tool that calculates the area of a space in square feet based on its dimensions. It works for rooms, floors, walls, gardens, and any surface that can be measured in feet.
People use this sqft calculator when planning flooring, tiling, painting, landscaping, or any project where they need to know how much material to buy. Knowing the square footage of a space helps you estimate costs and avoid over-buying or under-buying materials.
This square feet calculator works for rectangles, squares, triangles, circles, and irregular shapes.
What Is Square Footage?
Square footage is the measurement of a two-dimensional area where dimensions are expressed in feet. When you multiply a length in feet by a width in feet, the result is an area in square feet (ft²).
One square foot is the area of a square with sides of exactly one foot. Square footage is the standard unit of area for homes, rooms, and property in the United States.
How to Calculate Square Feet of a Room
The most common use of a square footage calculator is to find the area of a rectangular room. This is how to find square footage for rooms, floors, and walls.
Square Footage Formula for a Rectangle:
Area (ft²) = Length (ft) × Width (ft)
Example: A bedroom measuring 14 ft long and 12 ft wide.
- Step 1: Apply the formula: Area = 14 × 12
- Step 2: Area = 168 square feet
To find the square footage of a room, measure the length and width of the floor from wall to wall, and then multiply these two figures together.
How to Measure Square Feet
To measure square feet accurately, follow these steps:
- Step 1: Use a tape measure to find the length of the room in feet.
- Step 2: Measure the width of the room in feet.
- Step 3: If your measurements are in inches, divide by 12 to convert to feet.
- Step 4: Multiply the length by the width to determine the area in square feet.
Converting inches to feet before calculating:
If a room measures 168 inches long and 144 inches wide:
- Step 1: 168 ÷ 12 = 14 ft
- Step 2: 144 ÷ 12 = 12 ft
- Step 3: Area = 14 × 12 = 168 ft²
How to Find Square Footage of a Square Room
A square room has equal length and width. Simply multiply the side length by itself.
Formula:
Area (ft²) = Side × Side
Example: A square room with sides of 10 ft.
- Step 1: Area = 10 × 10 = 100 square feet
How to Calculate Square Footage of an L-Shaped Room
An L-shaped room cannot be measured in a single calculation. Divide it into two rectangles, calculate each area separately, then add them together.
Example: An L-shaped living area made up of two rectangles.
- Rectangle 1: 16 ft × 10 ft = 160 ft²
- Rectangle 2: 8 ft × 8 ft = 64 ft²
- Step 1: Add both areas: 160 + 64 = 224 square feet
This method works for any irregular shape — break it into simpler sections, calculate each one, and add the results together.
How to Calculate Square Footage of a Triangle
Formula:
Area (ft²) = (Base × Height) / 2
Example: A triangular section with a base of 10 ft and a height of 6 ft.
- Step 1: Area = (10 × 6) / 2
- Step 2: Area = 60 / 2 = 30 square feet
How to Calculate Square Footage of a Circle
Formula:
Area (ft²) = π × r²
Where r is the radius in feet.
Example: A circular patio with a diameter of 14 ft.
- Step 1: Radius = 14 ÷ 2 = 7 ft
- Step 2: Area = 3.14159 × 7²
- Step 3: Area = 3.14159 × 49 = 153.94 square feet
How to Calculate Square Footage of a Trapezoid
Formula:
Area (ft²) = ((Base 1 + Base 2) / 2) × Height
Example: A trapezoidal deck with bases of 12 ft and 8 ft and a height of 5 ft.
- Step 1: Area = ((12 + 8) / 2) × 5
- Step 2: Area = (20 / 2) × 5 = 10 × 5 = 50 square feet
Square Footage Unit Conversion Table
| Unit | Conversion to Square Feet |
|---|---|
| 1 square yard | 9 sq ft |
| 1 square meter | 10.764 sq ft |
| 1 square inch | 0.00694 sq ft |
| 1 acre | 43,560 sq ft |
| 1 square centimeter | 0.00108 sq ft |
Common Uses for Square Footage Calculations
This square foot calculator is useful for a wide range of home improvement and construction projects:
Flooring: Calculate the total floor area to determine how many boxes of tiles, hardwood planks, or rolls of carpet you need.
Painting: Calculate wall area to estimate how many gallons of paint are required. Most interior paints cover 350 to 400 sq ft per gallon.
Tiling: Find the total tile area needed for kitchens, bathrooms, or patios, then add 10% for cuts and waste.
Landscaping: Calculate garden beds, lawn areas, or patios to estimate the amount of soil, mulch, or pavers required.
Real Estate: Square footage is a standard measure used in property listings to describe the size of homes and commercial spaces.
How to Use This Square Footage Calculator
Using this square feet calculator is simple:
- Select the shape of your space.
- Enter the dimensions in feet, inches, yards, or meters.
- Enter the quantity if you are calculating multiple identical spaces.
- Click Calculate to instantly see the total square footage and cost estimate.
Quick Tip: Enter the price per square foot to calculate total material cost.
FAQs
What is a square footage calculator?
A square footage calculator is an online tool that calculates the area of a space in square feet based on its length and width measurements.
How do I calculate square feet of a room?
Measure the length and width of the room in feet and multiply them together. For example, a room 14 ft long and 12 ft wide has an area of 168 square feet.
How do I measure square feet?
Measure the length and width of the space in feet using a tape measure, then multiply the two values together. If measurements are in inches, divide each by 12 before multiplying.
How do I find square footage of an irregular room?
Divide the room into two or more rectangles. Calculate the area of each section separately and add the results together to get the total square footage.
How many square feet are in a square meter?
One square meter equals approximately 10.764 square feet. To convert square meters to square feet, multiply by 10.764.
How many square feet are in an acre?
One acre equals 43,560 square feet.
How do I calculate square footage for flooring?
Calculate the total floor area in square feet using length × width. Add 10% to account for cuts, waste, and future repairs before ordering materials.
What is the difference between square feet and square footage?
They mean the same thing. Square footage refers to the total area of a space measured in square feet.
How do I convert inches to square feet?
Measure the length and width in inches, divide each by 12 to convert to feet, then multiply to get the area in square feet.
Is this square footage calculator free?
Yes. Our online square footage calculator is completely free with no sign-up required.