Free Embeddable Calculator Widgets

Embed any of our 290+ free calculators on your website. Copy-paste iframe or script tag. Responsive, fast, and free.

Embed any of our 290+ free calculators on your website, blog, or app. Each widget is responsive, supports dark mode, and works in any iframe size (min 300px wide).

Quick Start

Two ways to embed:

Option 1: iframe (recommended)

<iframe src="https://running-calculator.com/embed/bmi-calculator/"
        width="100%" height="500" frameborder="0"
        style="border:1px solid #e5e7eb;border-radius:8px;"
        title="BMI Calculator - RunCalc">
</iframe>

Option 2: Script tag (auto-sizing)

<div class="runcalc-widget" data-calculator="bmi-calculator"></div>
<script src="https://running-calculator.com/embed.js" async></script>

The script tag version auto-resizes the iframe height based on content. You can embed multiple calculators on the same page — just add more <div class="runcalc-widget"> elements.

All Available Widgets