Square Footage Calculator

Follow these steps to calculate square footage:

1. Measure the length of your space using a tape measure.
2. Measure the width of your space. (For circles, this should equal the diameter; for triangles, this is the height.)
3. Select the measurement unit you used (feet, meters, inches, or yards).
4. Select the shape of your space: rectangle (most common), circle, or triangle.

The calculator will instantly display the area in square feet, square meters, square yards, and acres. For irregular shapes, break them into simpler components, calculate each separately, and add the results together.

A square footage calculator determines the area of a space by calculating how much two-dimensional surface a room, lot, or surface occupies. By entering the dimensions of your space and selecting its shape (rectangle, circle, or triangle), the calculator instantly provides the area in multiple units: square feet, square meters, square yards, and acres.

Understanding the square footage of a space is essential for many projects: estimating materials like paint, flooring, or carpet; determining property value; planning landscaping; or simply understanding how much space you have. This calculator makes it easy to work with different measurement units and shapes.

The square footage calculation uses different formulas depending on shape:

• Rectangle: Area = Length × Width
• Circle: Area = π × (Diameter ÷ 2)² = π × radius²
• Triangle: Area = (Base × Height) ÷ 2
• Unit Conversions:
  • 1 meter = 3.28084 feet
  • 1 square meter = 10.764 square feet
  • 1 square yard = 9 square feet
  • 1 acre = 43,560 square feet

Example 1 - Rectangle: A living room measuring 20 feet long and 15 feet wide: Area = 20 × 15 = 300 square feet. In square meters = 300 ÷ 10.764 = 27.87 m². In square yards = 300 ÷ 9 = 33.33 sq yd.

Example 2 - Circle: A circular patio with a diameter of 20 feet: Area = π × (20 ÷ 2)² = π × 10² = 314.16 square feet. In square meters = 314.16 ÷ 10.764 = 29.17 m².

Example 3 - Triangle: A triangular space with a base of 30 feet and height of 20 feet: Area = (30 × 20) ÷ 2 = 300 square feet. In acres = 300 ÷ 43,560 = 0.0069 acres.