Is embedding the Ohm's law 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 "Ohm's Law + Power Calculator by LK Forge" credit line that comes with the embed code.

What can visitors do with the embedded calculator?

They choose which two of the four quantities they know — voltage, current, resistance or power — and enter them. The tool solves the other two exactly and shows all four, with a battery-and-resistor schematic where the resistor glows brighter as the power rises, plus the linear I–V line whose slope is one over the resistance.

What formulas does it use?

Ohm's law V = I·R and the power law P = V·I, plus their rearrangements. For each of the six known pairs it applies the exact solution — for example Power and Voltage give current I = P/V and resistance R = V²/P, while Power and Resistance give V = √(P·R) and I = √(P/R). Everything is exact algebra done in base SI units.

What iframe height should I use, especially on mobile?

The snippet ships with height="780", which is tall enough that the schematic, the inputs, the four readouts and the I–V 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 780 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/ohms-law/ 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 an Ohm's Law Calculator to Your Website

LK Forge · 4 min read · Updated September 2026

You can add a full Ohm's law and power 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 enter any two of volts, amps, ohms and watts and get the other two. This guide covers the fastest way to embed the Ohm's Law + Power 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/ohms-law/"
        width="100%" height="780" loading="lazy"
        style="border:0;max-width:560px"
        title="Ohm's Law + Power Calculator by LK Forge"></iframe>
<p><a href="https://lkforge.com/tools/physics/ohms-law/">Ohm's Law + Power 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 with a 12 V, 100 Ω example solved, so a visitor sees results immediately and can then change them:

Choose the known pair: voltage and resistance, power and current, any of the six.
Enter two values: the other two are solved exactly and shown in the accent colour.
See the power: the resistor glows brighter as it dissipates more watts.
Read the I–V line: the straight-line proportionality whose slope is 1/R.

Pick the right height

The snippet uses height="780", which fits the schematic, the inputs, 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/ohms-law/ 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 Ohm's law, electrical power or basic circuits needs numbers students can actually solve.

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

Open the Ohm's Law Calculator

Frequently asked questions

Is embedding the Ohm's law 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 "Ohm's Law + Power Calculator by LK Forge" credit line that comes with the embed code.
What can visitors do with the embedded calculator?: They choose which two of the four quantities they know — voltage, current, resistance or power — and enter them. The tool solves the other two exactly and shows all four, with a battery-and-resistor schematic where the resistor glows brighter as the power rises, plus the linear I–V line whose slope is one over the resistance.
What formulas does it use?: Ohm's law V = I·R and the power law P = V·I, plus their rearrangements. For each of the six known pairs it applies the exact solution — for example Power and Voltage give current I = P/V and resistance R = V²/P, while Power and Resistance give V = √(P·R) and I = √(P/R). Everything is exact algebra done in base SI units.
What iframe height should I use, especially on mobile?: The snippet ships with height="780", which is tall enough that the schematic, the inputs, the four readouts and the I–V 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 780 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/ohms-law/ 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.