Is embedding the voltage drop 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 Drop Calculator by LK Forge" credit line that comes with the embed code.

What can visitors do with the embedded calculator?

They pick the system (DC, single-phase or three-phase), the source voltage, the load current, the one-way run length, the conductor metal (copper or aluminium) and the AWG wire gauge. The tool draws the run as a schematic that shades from green toward red as the drop grows, and reads out the conductor resistance, the drop in volts and percent, the voltage left at the load, and the power lost as heat.

What formula does it use?

It computes voltage drop directly as Vdrop = k·I·ρ·L/A, where I is current, L the one-way run length, ρ the conductor resistivity and A the cross-sectional area from the AWG gauge. The factor k is 2 for DC and single-phase circuits and √3 for a balanced three-phase line-to-line drop. It is a resistive model that uses conductor resistance only, which is accurate for DC and typical branch-circuit lengths.

What iframe height should I use, especially on mobile?

The snippet ships with height="820", which is tall enough that the schematic, the controls, the readouts and the drop-versus-length graph all fit without clipping even on a narrow phone where everything stacks into a single column. On a wider page the widget centres within its max-width of 560px. If you want it shorter you can lower the height, but 820 is the safe default 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-drop/ 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 — nothing is uploaded. 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 Voltage Drop Calculator to Your Website

LK Forge · 4 min read · Updated September 2026

You can add a full voltage drop 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 a wire run and see how much voltage it loses. This guide covers the fastest way to embed the Voltage Drop 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-drop/"
        width="100%" height="820" loading="lazy"
        style="border:0;max-width:560px"
        title="Voltage Drop Calculator by LK Forge"></iframe>
<p><a href="https://lkforge.com/tools/physics/voltage-drop/">Voltage Drop 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 straight from the LK Forge widget gallery.

What the widget shows

The calculator opens on a realistic 230 V run, so a visitor sees a result immediately and can then change it:

System & voltage: switch between DC, single-phase and three-phase, and pick the source voltage.
Current & length: slide the load current and the one-way run length and watch the drop climb.
Conductor & gauge: compare copper against aluminium and step the AWG size up or down.
Live readouts: conductor resistance, drop in volts and percent, voltage at the load, and power lost — with a 3%/5% verdict.

Pick the right height

The snippet uses height="820", which fits the schematic, the controls, the readouts and the graph without clipping even on a narrow phone, where they stack into one column. On a wider page the widget centres within its max-width:560px. That single height works across screen sizes, so there is nothing to tweak for mobile.

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/voltage-drop/ 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 lesson or a blog post on wiring, electrical circuits or Ohm's law needs a run of cable students can actually resize.

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

Open the Voltage Drop Calculator

Frequently asked questions

Is embedding the voltage drop 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 Drop Calculator by LK Forge" credit line that comes with the embed code.
What can visitors do with the embedded calculator?: They pick the system (DC, single-phase or three-phase), the source voltage, the load current, the one-way run length, the conductor metal (copper or aluminium) and the AWG wire gauge. The tool draws the run as a schematic that shades from green toward red as the drop grows, and reads out the conductor resistance, the drop in volts and percent, the voltage left at the load, and the power lost as heat.
What formula does it use?: It computes voltage drop directly as Vdrop = k·I·ρ·L/A, where I is current, L the one-way run length, ρ the conductor resistivity and A the cross-sectional area from the AWG gauge. The factor k is 2 for DC and single-phase circuits and √3 for a balanced three-phase line-to-line drop. It is a resistive model that uses conductor resistance only, which is accurate for DC and typical branch-circuit lengths.
What iframe height should I use, especially on mobile?: The snippet ships with height="820", which is tall enough that the schematic, the controls, the readouts and the drop-versus-length graph all fit without clipping even on a narrow phone where everything stacks into a single column. On a wider page the widget centres within its max-width of 560px. If you want it shorter you can lower the height, but 820 is the safe default 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-drop/ 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 — nothing is uploaded. 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.