Is embedding the polygon area calculator free?

Yes. It is free to embed on any site, with no account, no API key and no usage limits. Every calculation runs entirely in your visitor’s own browser, so there is no server cost — we only ask that you keep the small "Polygon Area Calculator by LK Forge" credit line that comes with the embed code.

What can the embedded calculator work out?

The same three modes as the full tool. Coordinates mode finds the exact area of any simple (non-self-crossing) polygon from its vertex (x, y) coordinates using the shoelace formula. Triangle mode takes three side lengths and applies Heron’s formula. Regular-polygon mode takes the number of sides and one side length. Each mode also shows the perimeter and a labelled diagram of the shape.

Can it find a polygon’s area from just the side lengths?

Only for a triangle, and that is a deliberate limit, not a missing feature. Three side lengths lock a triangle into one rigid shape, so Heron’s formula gives its area. A quadrilateral or any polygon with four or more sides can flex — the same side lengths can enclose different areas — so side lengths alone do not determine the area. For those shapes the widget uses coordinates and the shoelace formula instead.

Does it show the working, not just the answer?

Yes. Every mode prints a step-by-step table — the shoelace sum term by term, the Heron semi-perimeter and square root, or the regular-polygon formula with the apothem and interior angle — alongside a scaled diagram of the shape. That makes it useful for a maths lesson or a worked example in a blog post, not just a quick answer.

Where can I embed it — WordPress, Wix, Squarespace, Notion?

Anywhere you can add HTML, because it is a standard iframe. In WordPress use a Custom HTML block; in Squarespace a Code/Embed block; in Wix an Embed HTML element; in Ghost an HTML card; in Notion paste the /embed/polygon-area/ URL as an embed. On a plain HTML page or an intranet, paste the snippet straight into the markup.

Does the embedded calculator track visitors or set cookies?

No. Everything runs locally in the visitor’s browser — the numbers they enter are never sent to a server. The embed sets no tracking cookies and sends no analytics, so it is safe to place on a privacy-sensitive site, an intranet, or a page for students.

Widgets

How to Add a Polygon Area Calculator to Your Website

LK Forge · 4 min read · Updated August 2026

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.

Grab the embed code from the LK Forge widget gallery — free, no sign-up.

Open the Polygon Area Calculator

Frequently asked questions

Is embedding the polygon area calculator free?: Yes. It is free to embed on any site, with no account, no API key and no usage limits. Every calculation runs entirely in your visitor’s own browser, so there is no server cost — we only ask that you keep the small "Polygon Area Calculator by LK Forge" credit line that comes with the embed code.
What can the embedded calculator work out?: The same three modes as the full tool. Coordinates mode finds the exact area of any simple (non-self-crossing) polygon from its vertex (x, y) coordinates using the shoelace formula. Triangle mode takes three side lengths and applies Heron’s formula. Regular-polygon mode takes the number of sides and one side length. Each mode also shows the perimeter and a labelled diagram of the shape.
Can it find a polygon’s area from just the side lengths?: Only for a triangle, and that is a deliberate limit, not a missing feature. Three side lengths lock a triangle into one rigid shape, so Heron’s formula gives its area. A quadrilateral or any polygon with four or more sides can flex — the same side lengths can enclose different areas — so side lengths alone do not determine the area. For those shapes the widget uses coordinates and the shoelace formula instead.
Does it show the working, not just the answer?: Yes. Every mode prints a step-by-step table — the shoelace sum term by term, the Heron semi-perimeter and square root, or the regular-polygon formula with the apothem and interior angle — alongside a scaled diagram of the shape. That makes it useful for a maths lesson or a worked example in a blog post, not just a quick answer.
Where can I embed it — WordPress, Wix, Squarespace, Notion?: Anywhere you can add HTML, because it is a standard iframe. In WordPress use a Custom HTML block; in Squarespace a Code/Embed block; in Wix an Embed HTML element; in Ghost an HTML card; in Notion paste the /embed/polygon-area/ URL as an embed. On a plain HTML page or an intranet, paste the snippet straight into the markup.
Does the embedded calculator track visitors or set cookies?: No. Everything runs locally in the visitor’s browser — the numbers they enter are never sent to a server. The embed sets no tracking cookies and sends no analytics, so it is safe to place on a privacy-sensitive site, an intranet, or a page for students.