📐 Free Square Footage Calculator
Quickly calculate the area of any space - rectangle, square, circle, or triangle. Enter your measurements below for instant results in square feet, square meters, or square inches.
What is this tool?
Wondering how to calculate square footage for your next home improvement project? Our free square footage calculator does the work in seconds. Select your shape, enter measurements, and get the exact area in square feet, square meters, or square inches. Whether you're ordering flooring, estimating paint, or planning a garden, this area calculator gives accurate results instantly. It runs entirely in your browser with no data upload.
How it works
Calculating square footage is easy with the right formula. Our area calculator applies the correct equation for each shape.
Rectangle
Example: 12 ft x 10 ft = 120 sq ft.
Square
Example: 8 ft x 8 ft = 64 sq ft.
Circle
Example: Radius 6 ft = 113.1 sq ft.
Triangle
Example: 10 ft base x 8 ft height = 40 sq ft.
How to use
- Select your shape - Rectangle, Square, Circle, or Triangle.
- Enter measurements - Dimensions adjust automatically based on shape.
- Choose output unit - Square Feet, Inches, or Meters.
- Click Calculate - Instant results with conversions.
Reference Table
| Shape | Dimensions | Sq Ft | Sq M |
|---|---|---|---|
| Rectangle | 10x12 | 120 | 11.15 |
| Rectangle | 20x20 | 400 | 37.16 |
| Circle | Radius 5 | 78.54 | 7.30 |
| Triangle | 10x8 | 40 | 3.72 |
Frequently Asked Questions
How do I calculate square footage of an irregular room?
Divide the space into smaller regular shapes, calculate each area separately, then add them together. An L-shaped room can be split into two rectangles.
How many square feet is an acre?
One acre equals 43,560 square feet.
Do I need to measure in feet?
Use any consistent unit. The result will be in square feet of that unit. The tool also shows square meters and square inches.
Tips & Advice
When measuring for flooring, add 10% extra to cover waste. One gallon of paint covers about 350-400 sq ft. For landscaping, sketch the area and break it into simple shapes before using our free area calculator.