Square Footage Calculator
An inches to square feet calculator is a free online tool that converts linear dimensions measured in inches into total area units. By processing length and width inputs, it simplifies the math required for construction and home remodeling projects.
What Is a Square Foot?
A square foot (sq ft) is a two-dimensional unit of area representing a square with sides of 1 foot (12 inches). It is the standard imperial unit used in real estate, architecture, and engineering to define the surface area of rooms, floors, and land.
Unlike linear feet, which measure distance, square feet quantify the total floor space or surface coverage within a property.
How to Calculate Square Footage
To calculate square footage, multiply the length of a space by its width. If your measurements are in inches, you must first convert them to feet by dividing each dimension by 12, or multiply the total square inches by 144 to reach the final area.
Square Footage Formulas by Shape
Use these geometric formulas to determine area based on the specific layout of your space.
Rectangle
Calculate the area of a rectangle by multiplying length by width.
sq ft = length × width
Rectangular Border
Calculate a border area by subtracting the inner rectangle from the outer rectangle:
sq ft = (outer length × outer width) − (inner length × inner width)
Circle
Calculate the area of a circle by squaring the radius and multiplying by pi (π ≈ 3.14159):
sq ft = π × radius²
Triangle
Calculate the area of a triangle by multiplying the base by the height and dividing by two:
sq ft = (base × height) / 2
How to Measure Square Footage for Properties
Measuring properties requires precision to ensure accurate material procurement and property valuation.
Measuring a Room
Measure the length and width of the room using a tape measure. If the room contains alcoves or irregular corners, break the floor plan into smaller, distinct rectangles, calculate the area for each segment, and sum the results to find the total square footage.
Calculating the Total Square Footage of a Home
Calculate the total square footage of a home by summing the finished, livable area of all individual rooms. Exclude non-livable spaces such as garages, porches, or unfinished basements to maintain consistency with professional real estate appraisal standards.
How to Calculate Square Footage Pricing
Determine square footage pricing by dividing the total cost of the project or property by its total square footage. This metric helps homeowners compare renovation costs or property values across different listings or contractor quotes.
How to Convert Units to Square Feet
When working with diverse measurement systems, use these conversion factors to standardize your data.
Square Meters to Square Feet
Multiply square meters by 10.764 to convert to square feet.
Acres to Square Feet
Multiply the number of acres by 43,560 to find the total square footage.
Square Feet to Square Meters
Multiply square feet by 0.0929 to convert to square meters.