Is embedding the resistor color code 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 "Resistor Color Code Calculator by LK Forge" credit line that comes with the embed code.

What can visitors do with the embedded calculator?

They choose 4, 5 or 6 bands and set each band’s color from a menu. The tool decodes them into a resistance, a ± tolerance and the exact minimum-to-maximum value range, and draws a color-coded resistor so a visitor can match it against the real part in their hand.

Does it handle 4, 5 and 6-band resistors?

Yes. A 4-band resistor has two digit bands, a multiplier and a tolerance; a 5-band adds a third digit; a 6-band adds a temperature-coefficient band in ppm/K. The embed switches between all three and shows only the bands that apply.

What iframe height should I use, especially on mobile?

The snippet ships with height="720", which fits the resistor diagram, the band menus 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/resistor-color-code/ URL as an embed. 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 Resistor Color Code Calculator to Your Website

LK Forge · 4 min read · Updated September 2026

You can add a full resistor color code 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 the bands and read the value. This guide covers the fastest way to embed the Resistor Color Code 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/resistor-color-code/"
        width="100%" height="720" loading="lazy"
        style="border:0;max-width:560px"
        title="Resistor Color Code Calculator by LK Forge"></iframe>
<p><a href="https://lkforge.com/tools/physics/resistor-color-code/">Resistor Color Code 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 ±5% resistor, so a visitor sees a decoded value at once and can then change it:

Number of bands: switch between 4, 5 and 6-band resistors.
Band colors: set each digit, the multiplier, the tolerance and (6-band) the temperature coefficient.
Live diagram: a color-coded resistor updates as you choose.
Readouts: the resistance, the ± tolerance and the exact min-to-max range.

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/resistor-color-code/ 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 resistor values students can decode themselves.

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

Open the Resistor Color Code Calculator

Frequently asked questions

Is embedding the resistor color code 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 "Resistor Color Code Calculator by LK Forge" credit line that comes with the embed code.
What can visitors do with the embedded calculator?: They choose 4, 5 or 6 bands and set each band’s color from a menu. The tool decodes them into a resistance, a ± tolerance and the exact minimum-to-maximum value range, and draws a color-coded resistor so a visitor can match it against the real part in their hand.
Does it handle 4, 5 and 6-band resistors?: Yes. A 4-band resistor has two digit bands, a multiplier and a tolerance; a 5-band adds a third digit; a 6-band adds a temperature-coefficient band in ppm/K. The embed switches between all three and shows only the bands that apply.
What iframe height should I use, especially on mobile?: The snippet ships with height="720", which fits the resistor diagram, the band menus 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/resistor-color-code/ URL as an embed. 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.