Option 1: Embed free
Pick a calculator, paste the snippet into any page (WordPress, Shopify, Webflow, plain HTML). It stays up to date automatically — we host it, you embed it. Keep the credit link below the widget intact; that's the deal for free use.
<iframe src="https://www.sellerscalc.com/embed/break-even-roas-calculator" width="100%" height="760" style="border:0;border-radius:12px;" title="Break-even ROAS Calculator" loading="lazy"></iframe> <p style="font-size:14px">Free Break-even ROAS Calculator by <a href="https://www.sellerscalc.com/?utm_source=embed&utm_medium=snippet" rel="nofollow">SellersCalc</a></p>
How to embed a calculator in your website
The snippet is a single lazy-loaded iframe — it works anywhere you can paste HTML, adds no JavaScript to your page, and stays up to date automatically. Platform by platform:
WordPress
Edit the page or post, add a Custom HTML block where you want the calculator, paste the snippet, and update. On the classic editor, switch to the Text tab first. No plugin required.
Shopify
Go to Online Store → Pages, open the page, click the <> (Show HTML) button in the editor toolbar, paste the snippet where you want it, and save.
Webflow
Drag an Embed element onto the page, paste the snippet into the code editor, save, and publish.
Squarespace
Add a Code block to the page section, paste the snippet, and save. Code blocks require the Business plan or above.
Wix
Click Add → Embed code → Embed HTML, paste the snippet into the HTML box, then position the frame and publish.
Plain HTML
Paste the snippet anywhere inside <body>. No script
tags, no build step.
Option 2: We build yours — $299
A calculator like these, but for your business: your numbers, your branding, your domain — with a lead-capture form that sends every submission straight to your inbox. The same interactive-calculator playbook that outconverts static pages, done for you.
- Delivered within 48 hours of order confirmation.
- You get the files — a static bundle plus a one-page deploy guide (drag-and-drop hosting walkthrough). You host it, you own it; no subscription, no lock-in. Deployment support beyond the guide isn't included at this price.
- Lead capture to your inbox via your own form service or email — we never store your leads.
- 2 builds per month. Small capacity, kept deliberately — confirmation may take 1–3 weeks depending on availability. Payment by card (Stripe) after confirmation, never up front.
Common questions
How do I embed a calculator in WordPress, Shopify, Wix or Webflow?
Copy the two-line embed snippet from the calculator picker on this page, then paste it into your platform’s HTML block: a “Custom HTML” block in WordPress, the “<>” Show-HTML view of any Shopify page, an “Embed” element in Webflow, a “Code” block in Squarespace, or Add → Embed HTML in Wix. Publish and the calculator is live — no plugin, script tag or account needed.
Will the embed slow down my site?
No. The embed is a single lazy-loaded iframe — it adds no JavaScript to your page, loads after your own content, sets no cookies, and cannot affect your Core Web Vitals scores for LCP or CLS when pasted below the fold.
Can I remove the credit link on the free embed?
No — the visible credit link is the price of the free embed (see our terms). If you need an unbranded calculator, that’s exactly what the $299 custom build is for.
What does the $299 build include, exactly?
One calculator (your formula or one of ours adapted), your colors and logo, a lead-capture form wired to your email or form service, mobile-ready and accessible, delivered as files you host. One revision round included.
Do the free embeds track my visitors?
No. Embeds run no analytics, set no cookies, and show no consent banners. All calculation happens in the visitor’s browser.