Square Foot Calculator
Calculate the area in square feet for rectangular, square, circular, or triangular spaces. Perfect for flooring, painting, landscaping, and more.
Published by:
isCalculator Editorial Team
Was this calculator helpful?
How to use this tool?
How to Use the Square Foot Calculator
This calculator computes the area in square feet (sq ft) for common shapes. All measurements must be entered in feet (ft).
- Select a shape from the dropdown menu (Rectangle, Square, Circle, or Triangle).
- Enter the required dimensions in the input fields that appear. Use positive numbers only (e.g., 10, 5.5).
- Click "Calculate Area" to see the result.
Shape formulas used:
- Rectangle: Length × Width
- Square: Side × Side
- Circle: π × Radius²
- Triangle: ½ × Base × Height
The result displays the area in square feet along with the formula explanation. If inputs are missing or invalid, an error message will appear.
Previous Results
| Result | Inputs | Date |
|---|
Frequently Asked Questions
A square foot calculator helps you compute the area of a space in square feet by entering dimensions like length, width, radius, or base and height.
Multiply the length by the width. For example, a room 10 ft by 12 ft is 120 sq ft.
Yes, enter the radius. The formula is π × radius². For a radius of 5 ft, the area is about 78.54 sq ft.