Square Footage Calculator
Calculate area for squares, rectangles, circles, borders, and triangles
Calculator
Select a shape and enter dimensions to calculate area.
About the Square Footage Calculator
The Square Footage Calculator helps you quickly determine the total area of a wide range of shapes commonly used in construction, remodeling, flooring projects, landscaping, and home measurements. It supports squares, rectangles, rectangular borders, circles, circular borders, and triangles using three sides. This tool is ideal for homeowners, contractors, real estate professionals, and DIY projects where accurate area calculations are essential.
What You Can Calculate
- Square Area: Calculates the surface area of a square using a single side length.
- Rectangle Area: Computes area using length and width measurements.
- Rectangle Border Area: Finds the area of frames, pathways, and borders by subtracting the inner rectangle from the outer rectangle.
- Circle Area: Calculates surface area using a radius value.
- Circle Border Area: Computes ring-shaped areas by subtracting the inner circle from the outer circle.
- Triangle Area: Uses Heron's formula to calculate the area from three side lengths—ideal for irregular triangle shapes.
Formulas Used in the Calculator
The calculator uses standard geometric equations to compute area for each supported shape:
- Square: A = side²
- Rectangle: A = length × width
- Rectangle Border: A = (outer length × outer width) − (inner length × inner width)
- Circle: A = π × radius²
- Circle Border: A = π × (R² − r²)
- Triangle (Heron's Formula): A = √(s(s − a)(s − b)(s − c)) where s = (a + b + c) / 2
How to Use the Calculator
- Select a shape from the dropdown menu — such as square, rectangle, circle, or triangle.
- Enter the required dimensions (side lengths, radius, or inner/outer measurements for borders).
- The calculator instantly displays the total area in both square feet (ft²) and square meters (m²).
Applications of Square Footage Calculation
Accurate square footage measurements are essential for home renovation, material cost estimation, construction planning, and interior design. This calculator simplifies tasks such as determining flooring requirements, estimating paint coverage, sizing landscaping features, measuring outdoor structures, and evaluating property spaces. With support for complex shapes like borders and multi-side triangles, it provides flexibility for both simple and irregular measurement needs.