How to Embed an Equity Dilution Calculator on Your Website
If you run a startup accelerator, venture blog, or founder community, adding an interactive equity dilution calculator to your site is one of the highest-value tools you can offer. Founders need to understand dilution before they sign term sheets, and a calculator they can use right on your site builds trust and engagement.
Here's how to embed the FounderMath equity dilution calculator on any website with a single line of code.
Quick: The Embed Code
Copy this line and paste it into your HTML:
<iframe src="https://founder-math.com/widget-equity-dilution.html" width="100%" height="600" frameborder="0" style="border-radius:12px;" title="Equity Dilution Calculator"></iframe>
What the Widget Does
The embeddable equity dilution calculator lets founders:
- Enter their current equity percentage (e.g., 33%)
- Select their funding stage (pre-seed through Series B)
- Choose how many rounds they're planning (1-4 rounds)
- See instant dilution projections with a visual chart showing ownership at each round
All calculations happen in the user's browser. No data is sent to any server. The widget is lightweight, fast-loading, and mobile-responsive.
Why Embed a Calculator Instead of Linking?
You could just link to an external calculator. But embedding keeps users on your site:
| Factor | External Link | Embedded Widget |
|---|---|---|
| User leaves your site | Yes | No |
| Time on page | Seconds | Minutes |
| Brand experience | Fragmented | Seamless |
| SEO benefit | None | Lower bounce rate |
| Mobile experience | New tab | Inline |
For accelerator programs, an embedded calculator is especially valuable because founders use it during workshops and office hours without leaving your curriculum platform.
Embedding Options
Option 1: Basic iframe (Recommended)
The simplest approach. Works on any website, CMS, or page builder:
<iframe
src="https://founder-math.com/widget-equity-dilution.html"
width="100%"
height="600"
frameborder="0"
style="border-radius:12px;"
title="Equity Dilution Calculator">
</iframe>
Option 2: Custom Height
For pages with more vertical space, use a taller widget for a better experience:
<iframe
src="https://founder-math.com/widget-equity-dilution.html"
width="100%"
height="750"
frameborder="0"
style="border-radius:12px;max-width:800px;margin:0 auto;display:block;"
title="Equity Dilution Calculator">
</iframe>
Option 3: WordPress
In WordPress, use the Custom HTML block and paste the iframe code. If your theme strips iframes, use a shortcode plugin like "Insert Iframe" or add this to your functions.php:
// Allow FounderMath iframe in WordPress
add_filter('wp_kses_allowed_html', function($tags) {
$tags['iframe'] = array(
'src' => true, 'width' => true, 'height' => true,
'frameborder' => true, 'style' => true, 'title' => true
);
return $tags;
});
Who Should Embed This Calculator?
Startup Accelerators & Incubators
Add the calculator to your curriculum pages so founders can model their dilution during "Understanding Your Cap Table" workshops. The widget includes a "Powered by FounderMath" attribution link that's unobtrusive.
Venture Capital Blogs
If you write about fundraising, dilution, or cap tables, embedding the calculator directly in your article lets readers interact with the concepts you're explaining. This dramatically increases time-on-page and social sharing.
Founder Communities & Forums
Whether it's a Slack community, Discourse forum, or custom platform, the iframe embed works anywhere HTML is supported. Give your members a practical tool they'll use repeatedly.
Equity Education Courses
Online courses about startup equity can embed the calculator as an interactive exercise. Students enter their own hypothetical numbers and see real projections instantly.
Get the Embed Code
Visit the widget page to see the live calculator and copy the embed code for your site.
Get the Embed Code (Free)Try the Full Dilution Calculator
Technical Details
Performance
The widget is a single HTML file with no external JavaScript dependencies. It loads Chart.js from a CDN only when the user generates results. Total page weight is under 50KB — lighter than most images on your site.
Privacy
All calculations run entirely in the user's browser. No data is sent to FounderMath or any third-party server. The widget does load Google Analytics for aggregate usage tracking, but no personal data or calculation inputs are collected.
Browser Support
The widget works on all modern browsers (Chrome, Firefox, Safari, Edge) and is fully responsive for mobile devices. It also works inside WebView containers used by many mobile apps.
Customization
The widget uses a dark theme by default that matches most tech/startup sites. If you need a light theme or custom colors, contact us and we can create a branded version for your organization.
Other Calculators Available
The equity dilution widget is our most popular embed, but we also offer 23 free interactive calculators covering:
- Equity dilution — multi-round dilution projections
- SAFE note conversion — model SAFE-to-equity conversion
- Runway calculator — how many months of cash you have
- Vesting schedule — cliff and monthly vesting timeline
- Cap table builder — manage ownership across rounds
- Equity tax calculator — estimate tax on stock options
All calculators are free to use and available at founder-math.com.
Frequently Asked Questions
Is the widget really free?
Yes, completely free. No signup, no API key, no rate limits. The "Powered by FounderMath" link in the widget is the only attribution required.
Can I remove the "Powered by FounderMath" link?
The attribution link helps other founders discover the tool. If you need a white-label version without attribution, contact us and we can discuss options.
Does it work on HTTPS sites?
Yes. The widget is served over HTTPS and works on any secure site without mixed-content warnings.
Can I track how many people use the calculator on my site?
The widget sends GA4 events for calculator usage. If you have Google Tag Manager on your parent page, you can capture these events. Alternatively, wrap the iframe in a container and track interaction with your own analytics.