Is embedding the voltage divider calculator free?

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

What can visitors do with the embedded calculator?

They set the input voltage and the two resistors R1 and R2, and optionally connect a load. The tool shows the tapped output Vout = Vin·R2/(R1+R2), how a load pulls that output down, the divider’s output ratio, the source current and the power it wastes, all on a live schematic.

Does it show the loading effect?

Yes — that is the point that trips people up. A load across the output sits in parallel with R2, lowering the effective bottom resistance and dropping Vout. The embed shows the loaded and unloaded output side by side so a visitor can see exactly how much a real load disturbs the divider.

What iframe height should I use, especially on mobile?

The snippet ships with height="780", which fits the schematic, the inputs and the readouts without clipping even on a narrow phone where they stack into one column. On a wider page the widget centres within its max-width of 560px. That single height works across screen sizes.

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/voltage-divider/ URL. On a plain HTML page, 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 — nothing is uploaded. The embed sets no tracking cookies and sends no analytics, so it is safe on a privacy-sensitive site, an intranet, or a page for students.

Widgets

How to Add a Voltage Divider Calculator to Your Website

LK Forge · 4 min read · Updated September 2026

You can add a full voltage divider 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 set two resistors and read the divided output. This guide covers the fastest way to embed the Voltage Divider Calculator, what it teaches, 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 widget to appear:

<iframe src="https://lkforge.com/embed/voltage-divider/"
        width="100%" height="780" loading="lazy"
        style="border:0;max-width:560px"
        title="Voltage Divider Calculator by LK Forge"></iframe>
<p><a href="https://lkforge.com/tools/physics/voltage-divider/">Voltage Divider Calculator</a>
   by <a href="https://lkforge.com/">LK Forge</a></p>

The <iframe> is the live calculator; 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 from the LK Forge widget gallery.

What the widget shows

The calculator opens on a 1 kΩ / 1 kΩ divider so a visitor sees half the input at once and can then change it:

Vin, R1 and R2: set the input voltage and the two resistors.
Load: connect a load across the output and watch Vout droop.
Fraction bar: a bar shows the output as a percentage of the input.
Readouts: loaded and unloaded Vout, the output ratio, the source current and the total power.

Where it works

Because it is a standard iframe, the embed works anywhere you can add HTML — WordPress (Custom HTML block), Squarespace (Code block), Wix (Embed HTML), Ghost (HTML card), Notion (paste the /embed/voltage-divider/ URL), or a plain HTML page. Copy the embed code from the widget gallery and paste it wherever a lesson or a post on electronics needs a divider students can adjust themselves.

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

Open the Voltage Divider Calculator

Frequently asked questions

Is embedding the voltage divider calculator free?: Yes. It is free to embed on any site, with no account, no API key and no usage limits. The whole calculation runs in your visitor’s own browser, so there is no server cost — we only ask that you keep the small "Voltage Divider Calculator by LK Forge" credit line that comes with the embed code.
What can visitors do with the embedded calculator?: They set the input voltage and the two resistors R1 and R2, and optionally connect a load. The tool shows the tapped output Vout = Vin·R2/(R1+R2), how a load pulls that output down, the divider’s output ratio, the source current and the power it wastes, all on a live schematic.
Does it show the loading effect?: Yes — that is the point that trips people up. A load across the output sits in parallel with R2, lowering the effective bottom resistance and dropping Vout. The embed shows the loaded and unloaded output side by side so a visitor can see exactly how much a real load disturbs the divider.
What iframe height should I use, especially on mobile?: The snippet ships with height="780", which fits the schematic, the inputs and the readouts without clipping even on a narrow phone where they stack into one column. On a wider page the widget centres within its max-width of 560px. That single height works across screen sizes.
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/voltage-divider/ URL. On a plain HTML page, 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 — nothing is uploaded. The embed sets no tracking cookies and sends no analytics, so it is safe on a privacy-sensitive site, an intranet, or a page for students.