Square Foot Calculator
Calculate the square footage of a rectangular room or circular area. Converts area results into square feet, square yards, and square meters.
Calculation Results
Total surface area in square feet (sq ft).
Total surface area in square yards (sq yd).
Total surface area in metric square meters.
Total surface area in square inches (sq in).
How This Calculator Works
To calculate square footage:
- Select the shape of the surface (Rectangular or Circular).
- Enter the dimensions (e.g. length/width for rectangles, diameter for circles).
- The calculator immediately displays the converted area in square feet, yards, meters, and inches.
Formula & Calculations
Area calculation formulas depend on the chosen geometry:
- Rectangles:
Area = Length × Width - Circles:
Area = π × (Diameter / 2)²
The resulting area is converted to various standard trade units:
- Square Yards: Divide square feet by 9.
- Square Meters: Multiply square feet by 0.0929.
- Square Inches: Multiply square feet by 144.
Step-by-Step Calculation Examples
Master Bedroom (15ft x 12ft)
Calculating carpet coverage for a rectangular bedroom floor.
- shape: rectangle
- length: 15
- width: 12
- area_sq_ft: 180.00 sq ft
- area_sq_yd: 20.00 sq yd
- area_sq_m: 16.72 sq m
Frequently Asked Questions
How do I calculate square feet of a room with an irregular shape?
Break the irregular room down into smaller, simpler shapes (like rectangles and triangles). Calculate the square footage of each section individually, and add them together to get the total area.
How many square feet are in a square yard?
There are exactly 9 square feet in a square yard (3 feet by 3 feet).