How do I calculate a room's square footage?

For rectangular rooms, simply select the 'Rectangle' option and multiply length by width.

Does it support L-shaped rooms?

You can calculate L-shapes by breaking them into two rectangles and adding their areas together.

What area units can I convert between?

The calculator supports square millimetres, square centimetres, square metres, square kilometres, square inches, square feet, square yards, square miles, acres, and hectares. Results update in real time as you change the shape dimensions or select a different output unit.

How do I calculate the area of a triangle?

The most common formula is Area = ½ × base × height, where height is the perpendicular distance from the base to the opposite vertex. If you only know the three side lengths (a, b, c), you can use Heron's formula: first compute s = (a+b+c)/2, then Area = √(s(s−a)(s−b)(s−c)). Both methods are available in the triangle section.

How many square feet are in an acre?

One acre equals exactly 43,560 square feet, or approximately 4,047 square metres (0.4047 hectares). This is a common conversion in real estate and land measurement. Enter a value in acres and the tool will instantly display the equivalent in square feet, square metres, and other units.

Can I calculate the area of an irregular or custom polygon?

Yes. The polygon mode lets you enter the coordinates of any vertices to calculate the area of an irregular shape using the Shoelace (Gauss) formula. This is useful for land plots, floor plans, or any custom boundary. You can input as many vertices as needed. The result is shown in square meters, square feet, acres, hectares, and other common units. All calculations happen in your browser with no data sent to a server.

Area Calculator — All Shapes & Unit Converter

About Area & Square Footage Calculator

Calculate the 2D surface area for common shapes and rooms with ease. Whether you are measuring a single wall for painting or a complex floor plan for tiling, our tool provides accurate square footage and area measurements.

How to Use

Choose the shape: Rectangle, Circle, Triangle, etc.
Input the base dimensions required for that shape.
Select your preferred units for inputs and outputs.
Review the total area calculated in square meters, feet, or other units.

Common Use Cases

Measuring square footage for real estate listings or home appraisals.
Estimating the amount of flooring, paint, or turf needed for home improvement.
Calculating area for design projects and architectural drafting.

Technical Details

Uses standard geometry formulas for 2D shapes with integrated unit conversion. All processing is done locally in your browser.

Frequently Asked Questions

How do I calculate a room's square footage?: For rectangular rooms, simply select the 'Rectangle' option and multiply length by width.
Does it support L-shaped rooms?: You can calculate L-shapes by breaking them into two rectangles and adding their areas together.
What area units can I convert between?: The calculator supports square millimetres, square centimetres, square metres, square kilometres, square inches, square feet, square yards, square miles, acres, and hectares. Results update in real time as you change the shape dimensions or select a different output unit.
How do I calculate the area of a triangle?: The most common formula is Area = ½ × base × height, where height is the perpendicular distance from the base to the opposite vertex. If you only know the three side lengths (a, b, c), you can use Heron's formula: first compute s = (a+b+c)/2, then Area = √(s(s−a)(s−b)(s−c)). Both methods are available in the triangle section.
How many square feet are in an acre?: One acre equals exactly 43,560 square feet, or approximately 4,047 square metres (0.4047 hectares). This is a common conversion in real estate and land measurement. Enter a value in acres and the tool will instantly display the equivalent in square feet, square metres, and other units.
Can I calculate the area of an irregular or custom polygon?: Yes. The polygon mode lets you enter the coordinates of any vertices to calculate the area of an irregular shape using the Shoelace (Gauss) formula. This is useful for land plots, floor plans, or any custom boundary. You can input as many vertices as needed. The result is shown in square meters, square feet, acres, hectares, and other common units. All calculations happen in your browser with no data sent to a server.

Local processing

Our local file, text and chart tools process content on your device using JavaScript, browser APIs and, where needed, WebAssembly. Our usage events do not include filenames, file contents, input text, chart values, raw errors, emails or license references. Network lookup tools (such as DNS, WHOIS, IP and speed tests) contact external services for their stated purpose. Loading the website, fonts, libraries and models also makes network requests. WebAssembly itself does not prevent network access.