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Free Calculator Widgets for Your Website

Put a working calculator directly into your article or sidebar. One <iframe> snippet — no JavaScript install, no signup, no tracking of your readers.

Available widgets

All four widgets are live below — pick the one that fits your article, grab its snippet, and paste it in.

Loan EMI calculator

Monthly EMI, total interest and payment breakdown for any loan. Best for personal-finance and loan-comparison posts.

<iframe src="https://calcpromaster.netlify.app/embed/loan-emi.html"
        style="width:100%;max-width:420px;height:560px;border:0;border-radius:12px"
        title="Loan EMI calculator by CalcProMaster"
        loading="lazy"></iframe>

Mortgage calculator

Monthly payment, loan amount and total interest for a home purchase with down payment. Multi-currency. Ideal for real-estate and home-buying content.

<iframe src="https://calcpromaster.netlify.app/embed/mortgage.html"
        style="width:100%;max-width:420px;height:600px;border:0;border-radius:12px"
        title="Mortgage calculator by CalcProMaster"
        loading="lazy"></iframe>

BMI calculator

Body Mass Index with WHO category and the healthy weight range for the entered height. Metric and imperial. Fits health and fitness articles.

<iframe src="https://calcpromaster.netlify.app/embed/bmi.html"
        style="width:100%;max-width:420px;height:620px;border:0;border-radius:12px"
        title="BMI calculator by CalcProMaster"
        loading="lazy"></iframe>

Percentage calculator

Three everyday percentage operations in one compact widget: X% of Y, X as a percent of Y, and percent change. Great for deal, stats and school posts.

<iframe src="https://calcpromaster.netlify.app/embed/percentage.html"
        style="width:100%;max-width:420px;height:480px;border:0;border-radius:12px"
        title="Percentage calculator by CalcProMaster"
        loading="lazy"></iframe>

Why embed it?

Zero setup: paste one iframe tag. The widget loads and works instantly.
Readers stay on your page: the calculation happens inside the frame; nothing navigates away.
Mobile-friendly: the widget resizes to its container and reflows on small screens.
Kept in sync: fixes and improvements ship automatically — you never update anything.

Fair-use guidelines

Keep the "Powered by CalcProMaster" attribution link inside the widget — that is the only thing we ask.
Don't present the widget as your own product or strip the attribution.
Don't load the widget inside another iframe from a third-party frame (no iframe-stuffing).
If your site gets heavy traffic, email us first so we can make sure the widget stays fast for everyone.

Sizing the widget

The widget is responsive: it fills whatever width its container gives it. On a typical blog, max-width:420px looks like a sidebar card; width:100% inside a content column reads as an inline tool. Keep height at 560px — shorter frames clip the results on small screens. If your site loads inside a mobile app webview, test one embed on a real device: some webviews restrict third-party iframes by default.

Troubleshooting

Blank frame: check that the src matches the snippet for that widget exactly (each one ends in .html — the bare path serves this listing page).
Browser console says "refused to frame": your own site's Content-Security-Policy needs frame-src https://calcpromaster.netlify.app. Add that directive to your host's headers.
Two scrollbars: the widget height is smaller than the frame — keep height at 560px or more.

FAQ

Does the widget track my readers?: No. The widget makes no external requests — the calculation runs entirely in the browser inside the frame.
Can I change the default values (currency, amount, rate)?: Not yet — defaults are fixed in this version. A configurable variant is on the roadmap; request it via the contact page if you need specific defaults.
Is it really free?: Yes. The only ask is the attribution link inside the widget, which you keep intact per the fair-use rules above.

More widgets coming

Mortgage, BMI and percentage joined the original loan EMI widget — all four are above. Need something else, like a unit converter or calorie calculator? Request it on our contact page and tell us which one would help your readers most. Popular requests get built first.