For site owners
Embed a calculator, free of charge
Drop one of our marketing calculators onto your own page as a finished widget. Your readers do the maths with you instead of leaving to find a tool. You pay nothing. In return, a link back to us stays visible. That is the whole arrangement.
The offer in one sentence
You get a working calculator for your site, free and without signing up. A visible credit line stays with it, the way any tool names its maker. How you mark up that link is your decision — rel="nofollow" is explicitly fine.
Why bother? An embedded calculator answers a specific question at the exact point it comes up, which is usually somewhere in the middle of your article. Building one yourself means input fields, formula logic and a bit of design. Here you paste a block and you are finished.
Three steps to a live calculator
Pick a calculator
Every widget is listed below with a live preview. Choose the one that fits your article.
Copy the code
One click on "Copy code" puts the embed snippet on your clipboard.
Paste it in
Add an HTML block on your page, paste the snippet, save. The calculator is live.
Calculators you can embed
7 of the metrics people look up most often, each a slimmed-down version of the full calculator. Try the preview, it really calculates. Amounts are in dollars.
ROAS Calculator
Return on ad spend — what every advertising dollar brings back.
Live preview
Embed code
<!-- ROAS Calculator · marketing-rechner.com -->
<iframe src="https://www.marketing-rechner.com/en/embed/roas-calculator" title="ROAS Calculator – marketing-rechner.com" width="100%" height="356" loading="lazy" style="border:0;width:100%;max-width:460px;border-radius:14px;overflow:hidden"></iframe>
<p style="margin:6px 0 0;max-width:460px;font:400 13px/1.5 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:#64748b">
Interactive ROAS Calculator by <a href="https://www.marketing-rechner.com/en/paid-ads/roas-calculator" target="_blank" rel="noopener">marketing-rechner.com</a>
</p>CPC Calculator
Cost per click — what a single click actually costs you.
Live preview
Embed code
<!-- CPC Calculator · marketing-rechner.com -->
<iframe src="https://www.marketing-rechner.com/en/embed/cpc-calculator" title="CPC Calculator – marketing-rechner.com" width="100%" height="356" loading="lazy" style="border:0;width:100%;max-width:460px;border-radius:14px;overflow:hidden"></iframe>
<p style="margin:6px 0 0;max-width:460px;font:400 13px/1.5 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:#64748b">
Interactive CPC Calculator by <a href="https://www.marketing-rechner.com/en/paid-ads/cpc-calculator" target="_blank" rel="noopener">marketing-rechner.com</a>
</p>CTR Calculator
Click-through rate — the share of impressions that turn into clicks.
Live preview
Embed code
<!-- CTR Calculator · marketing-rechner.com -->
<iframe src="https://www.marketing-rechner.com/en/embed/ctr-calculator" title="CTR Calculator – marketing-rechner.com" width="100%" height="356" loading="lazy" style="border:0;width:100%;max-width:460px;border-radius:14px;overflow:hidden"></iframe>
<p style="margin:6px 0 0;max-width:460px;font:400 13px/1.5 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:#64748b">
Interactive CTR Calculator by <a href="https://www.marketing-rechner.com/en/paid-ads/ctr-calculator" target="_blank" rel="noopener">marketing-rechner.com</a>
</p>CPM Calculator
Cost per mille — what a thousand impressions cost.
Live preview
Embed code
<!-- CPM Calculator · marketing-rechner.com -->
<iframe src="https://www.marketing-rechner.com/en/embed/cpm-calculator" title="CPM Calculator – marketing-rechner.com" width="100%" height="404" loading="lazy" style="border:0;width:100%;max-width:460px;border-radius:14px;overflow:hidden"></iframe>
<p style="margin:6px 0 0;max-width:460px;font:400 13px/1.5 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:#64748b">
Interactive CPM Calculator by <a href="https://www.marketing-rechner.com/en/paid-ads/cpm-calculator" target="_blank" rel="noopener">marketing-rechner.com</a>
</p>Conversion Rate Calculator
Conversion rate — the share of visitors who complete the goal.
Live preview
Embed code
<!-- Conversion Rate Calculator · marketing-rechner.com -->
<iframe src="https://www.marketing-rechner.com/en/embed/conversion-rate-calculator" title="Conversion Rate Calculator – marketing-rechner.com" width="100%" height="356" loading="lazy" style="border:0;width:100%;max-width:460px;border-radius:14px;overflow:hidden"></iframe>
<p style="margin:6px 0 0;max-width:460px;font:400 13px/1.5 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:#64748b">
Interactive Conversion Rate Calculator by <a href="https://www.marketing-rechner.com/en/profitability/conversion-rate-calculator" target="_blank" rel="noopener">marketing-rechner.com</a>
</p>Engagement Rate Calculator
Engagement rate measured on reach, not on follower count.
Live preview
Embed code
<!-- Engagement Rate Calculator · marketing-rechner.com -->
<iframe src="https://www.marketing-rechner.com/en/embed/engagement-rate-calculator" title="Engagement Rate Calculator – marketing-rechner.com" width="100%" height="356" loading="lazy" style="border:0;width:100%;max-width:460px;border-radius:14px;overflow:hidden"></iframe>
<p style="margin:6px 0 0;max-width:460px;font:400 13px/1.5 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:#64748b">
Interactive Engagement Rate Calculator by <a href="https://www.marketing-rechner.com/en/creator-economy/engagement-rate-calculator" target="_blank" rel="noopener">marketing-rechner.com</a>
</p>Profit Margin Calculator
Gross margin — what is left of revenue after the cost of goods.
Live preview
Embed code
<!-- Profit Margin Calculator · marketing-rechner.com -->
<iframe src="https://www.marketing-rechner.com/en/embed/profit-margin-calculator" title="Profit Margin Calculator – marketing-rechner.com" width="100%" height="356" loading="lazy" style="border:0;width:100%;max-width:460px;border-radius:14px;overflow:hidden"></iframe>
<p style="margin:6px 0 0;max-width:460px;font:400 13px/1.5 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:#64748b">
Interactive Profit Margin Calculator by <a href="https://www.marketing-rechner.com/en/profitability/profit-margin-calculator" target="_blank" rel="noopener">marketing-rechner.com</a>
</p>Where does the code go? By platform
Almost every website platform has a block for pasting in third-party HTML. Only the name differs. Here are the four most common ones.
WordPress – the "Custom HTML" block
- Open the post or page in the editor.
- At the spot where the calculator should sit, click the + and search for the "Custom HTML" block.
- Paste the code with Ctrl + V (Mac: Cmd + V).
- "Preview" shows the calculator straight away. Then save or update as usual.
On the classic editor, switch from "Visual" to "Text" in the top right and paste there. The Gutenberg block is the easier route.
Wix – the "Embed Code" element
- In the editor, click Add (+), then "Embed Code" → "Embed HTML".
- Drag the element where you want it and click "Enter Code".
- Paste the snippet and confirm with "Apply".
- Drag the element's edges until the whole calculator is visible, then publish.
Squarespace – the "Code" block
- Click an insert point, then the +.
- Choose the "Code" block, not "Embed" — that one only takes links.
- Delete the placeholder content, paste our snippet and leave the mode set to "HTML".
- Click outside the block to see the preview, then save.
Webflow – the "Embed" element
- Open the Add panel and drag an Embed element into place.
- The code editor opens by itself. Paste the snippet and click "Save & Close".
- The Designer shows a placeholder rather than the live widget. Use "Preview" to see it work.
- Publish the site.
Another platform, or a hand-written page?
The principle is the same everywhere: the snippet is ordinary HTML and belongs at the point in your markup where the calculator should appear. Look for an element called HTML, Code, Embed or Widget. If you edit the file yourself, drop it anywhere inside the <body>.
Terms of use
Short, and in plain language. Stick to these and nothing about this gets complicated.
- Free, personal or commercial. Use the widgets on as many pages as you like, company sites and online shops included.
- The credit stays. The visible, clickable reference to marketing-rechner.com needs to remain, both inside the widget and in the line underneath it.
- Do not hide the credit. It must not be concealed or redirected. Markup and wording are free, though —
rel="nofollow",rel="sponsored"or your own link text are explicitly fine. - No reselling. The widgets exist to be embedded, not traded. Please do not bundle them into a product or theme of your own.
- Updates arrive on their own. Because the widget loads from us, improvements to the maths and the design reach your page too. We reserve the right to develop individual widgets further or retire them.
Common questions
What does it cost to embed a calculator?
Nothing. Embedding is free, permanently, for personal and commercial sites alike. One condition: the visible credit line pointing to marketing-rechner.com stays in place. It ships with the widget, so there is nothing extra to add. How you mark up that link is entirely your decision.
Why are the widgets free?
Because we run the calculators anyway and an embed costs us nothing. You get a finished, working tool for your readers without building it yourself. We get a credit line, some recognition and the occasional visitor. There is nothing more to it.
Do I need to know how to code?
No. You copy a short block of code and paste it where the calculator should appear. WordPress, Wix, Squarespace and Webflow all have an HTML or code block for exactly this, so you never write a line yourself. The step-by-step instructions further down cover the common platforms.
Will the widget match my site design?
Partly. The calculator detects whether your page runs in light or dark mode and adapts its colours. Its width follows whatever space you give it. Please leave the code itself alone, and in particular do not remove the attribution link.
Does the widget collect data on my visitors?
No. There is no tracking inside the widget, it sets no cookies and loads no third-party scripts. The calculation runs in your visitor's browser. That keeps the embed straightforward under GDPR as well.
Does the link have to be a plain follow link?
That is your call. The credit needs to stay visible and clickable, but how you mark it up is an editorial decision. If you want to add rel="nofollow" or rel="sponsored", that is explicitly fine and changes nothing about the offer. You may reword the credit line too.
Still stuck on something?
If the embed will not behave, or you are missing a calculator that has no widget yet, the contact details are in the imprint. Who we are is on the about page. Every calculator in its full version is listed under all calculators.