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📐 Free Square Footage Calculator

Square Footage Calculator is a free online area tool that estimates floor space for rectangles, circles, and triangles. Enter room dimensions to get the area in square feet and square meters, which helps with materials planning. Everything is computed locally in your browser with no account needed. Homeowners and contractors use it to size rooms for flooring and painting.

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.

Shape

Length

Width

Unit

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

Area = Length x Width

Example: 12 ft x 10 ft = 120 sq ft.

Square

Area = Side x Side

Example: 8 ft x 8 ft = 64 sq ft.

Circle

Area = pi x Radius squared

Example: Radius 6 ft = 113.1 sq ft.

Triangle

Area = 0.5 x Base x Height

Example: 10 ft base x 8 ft height = 40 sq ft.

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

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.

Frequently Asked Questions

¿Cómo calculo los pies cuadrados de una habitación irregular?

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.

¿Cuántos pies cuadrados tiene un acre?

One acre equals 43,560 square feet.

¿Necesito medir en pies?

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.

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