How to Add a Polygon Area Calculator to Your Website

You can add a full polygon area calculator to any website, blog, or classroom page with a single line of code — free, with no sign-up, no plugin, and no script to install. Visitors pick how they want to describe the shape and it instantly returns the area, the perimeter, a labelled diagram, and the worked steps. This guide covers the fastest way to embed the Polygon Area Calculator, what each mode does, and where it works.

The quickest way: paste one embed snippet

An embed is just an <iframe> that loads the calculator from lkforge.com, plus a small credit line. Copy this into your page’s HTML where you want the tool to appear:

<iframe src="https://lkforge.com/embed/polygon-area/"
        width="100%" height="720" loading="lazy"
        style="border:0;max-width:560px"
        title="Polygon Area Calculator by LK Forge"></iframe>
<p><a href="https://lkforge.com/tools/math/polygon-area/">Polygon Area Calculator</a>
   by <a href="https://lkforge.com/">LK Forge</a></p>

The <iframe> is the live tool; the <p> underneath is a plain credit link. Keep that line — the visible link is what keeps the widget free to embed. You can also copy this exact code straight from the LK Forge widget gallery.

The three ways it finds an area

The widget opens with a mode switch so a visitor picks the method that matches what they know about the shape:

• Coordinates (any shape): paste the vertices as x, y pairs, one per line, in order around the polygon. The shoelace formula then gives the exact area of any irregular polygon — triangles, quadrilaterals, or shapes with dozens of sides.
• Triangle from three sides: enter side lengths a, b and c and Heron’s formula returns the area, as long as the sides can form a triangle.
• Regular polygon: enter the number of sides and one side length to get the area, perimeter, apothem, and interior angle.

Each mode draws a scaled, labelled diagram of the shape and prints the working as a step-by-step table, so it doubles as a teaching aid.

Where it works

Because it is a standard iframe, the embed works anywhere you can add HTML:

• WordPress: add a Custom HTML block and paste the snippet.
• Squarespace: use a Code / Embed block.
• Wix: add an Embed HTML / iframe element.
• Ghost: insert an HTML card.
• Notion: paste the /embed/polygon-area/ URL and choose "Create embed".
• Plain HTML, an intranet, or a lesson page: paste the snippet straight into the markup.

That’s the whole job. Copy the embed code from the widget gallery and paste it wherever a geometry lesson, a surveying or DIY post, or a worked example needs an instant area calculator.