One line of HTML. No sign-up, no API key, no tracking, no cost. Pick a calculator below, copy the code, paste it into your page. The only thing we ask is that you keep the credit link.
Three steps, about a minute.
Find your calculator in the list below and press Copy embed code. You get an <iframe> plus a few lines of script that let the frame resize itself to the calculator's height, so your readers never see an internal scrollbar.
Anywhere in your HTML. It works in WordPress (use a Custom HTML block), Ghost, Squarespace, Webflow, plain HTML, or any CMS that lets you insert raw HTML. The iframe is capped at 640px wide and scales down on mobile.
A small "Calculator by TallyBench" line renders under the embedded tool. That link is the whole price of admission — leave it in place and you are free to use the calculator commercially, on as many pages as you like, forever.
The short version of the licence.
| Question | Answer |
|---|---|
| Cost | Free, including commercial use |
| Sign-up or API key | Neither |
| Page limit | None |
| Visitor tracking | None — calculations run in the visitor's browser |
| Data sent to us | Nothing typed into the calculator ever leaves the browser |
| Condition | Keep the credit link under the calculator |
| Can you restyle it | Not currently — the embed renders in our styling |
Every tool on the site is embeddable. Filter by name below.
Embed code for — paste this into your page:
The iframe is marked loading="lazy", so browsers defer loading it until the reader scrolls near it. The calculator itself is plain HTML, CSS and JavaScript with no frameworks and no third-party requests, so once it does load it is a small download.
Drop it. The <iframe> alone works perfectly well — it simply stays at the default 640px height instead of shrinking to fit the calculator, which for most tools means some empty space at the bottom.
Yes. Commercial use is fine, ads included. We ask only that the credit link stays visible and is not marked nofollow, since that link is what makes this worth offering.
Both are worth telling us about — the contact route is on the About page. A calculator that someone actually wants to embed is the best possible argument for building it.
Browse everything first on the homepage, read the long-form guides in Articles, or see the reasoning behind the numbers in the books.