Free Embeddable Calculator Widgets
8 of our calculators run as standalone widgets you can drop into your own site. One line of HTML, no signup, no API key, no cost, and no tracking scripts loaded into your page.
Licence — the short version. Embed any of these on any site, commercial or not, for free. The only condition is that you keep the “Powered by DecisionsCalc” link visible and followable. Don't remove it, hide it with CSS, or add rel="nofollow" to it. That link is the entire price.
You may not re-host a modified copy of the calculator, or present the figures as your own research. We may change the rates inside a widget when the underlying law changes — that is the point of embedding rather than hard-coding.
How to embed
Copy the snippet under any widget and paste it into your page's HTML. It works as-is with a fixed height.
Optional auto-sizing. Each widget reports its own height to the parent page. To have the iframe follow it — worth doing on mobile, where the layout wraps taller — add this once, anywhere on the page:
<script src="https://decisionscalc.com/dc-embed.js" async></script>It only accepts height messages from decisionscalc.com, and it's about 20 lines — read it first and copy it into your own bundle if you'd rather not load a third-party script.
The widgets
Rent vs. Buy Calculator
Net cost of buying against renting over your actual time horizon, including the break-even year. Six countries in one widget.
Typically embedded by: Estate agents, mortgage brokers, relocation and personal-finance sites
<iframe data-dc-embed src="https://decisionscalc.com/embed/rent-vs-buy-calculator/" width="100%" height="620" style="border:0;max-width:480px" loading="lazy" title="Rent vs. Buy Calculator by DecisionsCalc"></iframe>Compound Interest Calculator
Growth on a starting amount plus monthly contributions, split into what you put in and what the market added. Currency selectable, so it suits any audience.
Typically embedded by: Personal-finance blogs, investing sites, financial educators
<iframe data-dc-embed src="https://decisionscalc.com/embed/compound-interest-calculator/" width="100%" height="490" style="border:0;max-width:480px" loading="lazy" title="Compound Interest Calculator by DecisionsCalc"></iframe>FIRE Calculator
The number you need to stop working, from your spending and withdrawal rate — plus how many years away it is at your current savings rate.
Typically embedded by: FIRE and early-retirement blogs, investing communities
<iframe data-dc-embed src="https://decisionscalc.com/embed/fire-calculator/" width="100%" height="600" style="border:0;max-width:480px" loading="lazy" title="FIRE Calculator by DecisionsCalc"></iframe>Emergency Fund Calculator
How many months of essentials you should hold, adjusted for how secure your income is — and how long your current savings rate takes to get there.
Typically embedded by: Personal-finance blogs, budgeting sites, credit unions
<iframe data-dc-embed src="https://decisionscalc.com/embed/emergency-fund-calculator/" width="100%" height="615" style="border:0;max-width:480px" loading="lazy" title="Emergency Fund Calculator by DecisionsCalc"></iframe>UK Stamp Duty (SDLT) Calculator
England & Northern Ireland SDLT at 2026/27 rates, with the band-by-band breakdown and first-time buyer and additional-property options.
Typically embedded by: UK conveyancers, estate agents, mortgage advisers
<iframe data-dc-embed src="https://decisionscalc.com/embed/uk-stamp-duty-calculator/" width="100%" height="430" style="border:0;max-width:480px" loading="lazy" title="UK Stamp Duty (SDLT) Calculator by DecisionsCalc"></iframe>Scotland LBTT Calculator
Land and Buildings Transaction Tax including the 8% Additional Dwelling Supplement, which is charged on the whole price rather than by band.
Typically embedded by: Scottish solicitors and property sites
<iframe data-dc-embed src="https://decisionscalc.com/embed/scotland-lbtt-calculator/" width="100%" height="430" style="border:0;max-width:480px" loading="lazy" title="Scotland LBTT Calculator by DecisionsCalc"></iframe>Wales LTT Calculator
Land Transaction Tax on the Welsh Revenue Authority bands, including the separate higher-rate table that applies from the first pound.
Typically embedded by: Welsh conveyancers and property sites
<iframe data-dc-embed src="https://decisionscalc.com/embed/wales-ltt-calculator/" width="100%" height="410" style="border:0;max-width:480px" loading="lazy" title="Wales LTT Calculator by DecisionsCalc"></iframe>Australia Private Health Rebate Calculator
Income-tested rebate tiers against the Medicare Levy Surcharge, so a reader can see whether cover costs less than the surcharge.
Typically embedded by: Australian health-insurance comparison and advice sites
<iframe data-dc-embed src="https://decisionscalc.com/embed/australia-private-health-rebate-calculator/" width="100%" height="530" style="border:0;max-width:480px" loading="lazy" title="Australia Private Health Rebate Calculator by DecisionsCalc"></iframe>Where the figures come from
Every widget reads the same rate tables as the hosted calculator, so an embedded copy and our own page never disagree. Tax bands are taken from the issuing authority — HMRC, Revenue Scotland, the Welsh Revenue Authority, the ATO — and each tool page states its sources and the date they were last checked.
Figures are compiled from public sources and are not individually verified by a regulated adviser. They are general information, not financial advice. If you embed one of these, that caveat travels with it, and we'd ask you not to present the output as personalised advice to your readers.
Want one we don't offer?
There are fifteen calculators on the site and 8 run as widgets so far. If you'd embed a different one — debt payoff, car ownership, childcare, university cost, any of the six-country comparisons — tell us which and we'll build it. A specific request from someone who will actually use it beats us guessing.
Related
- Cross-country financial data — the underlying six-country figures, free to cite.
- All calculators — the full set, including the ten not yet available as widgets.
- Methodology — how the figures are compiled and checked.