Free Business Day Calculator Widgets for Your Website

Add a free business day calculator to your website or blog in 30 seconds. Pick a calculator, choose a theme and width, copy the iframe snippet, and paste it into any HTML page, CMS, or documentation tool. The widget stays free and accurate forever.

1. Choose a calculator

2. Customise

Theme

Width

Height (px)

Recommended: 620px

3. Live preview

Light theme · 100%

4. Copy embed code

<iframe
  src="https://businessdaycalculator.org/embed/business-days-between-dates?theme=light"
  width="100%"
  height="620"
  frameborder="0"
  style="border:none;border-radius:8px;overflow:hidden;max-width:100%;"
  title="Business Days Between Dates"
  loading="lazy"
></iframe>

Frequently Asked Questions

Is the embed widget free?

Yes. Every calculator is free to embed on any website, blog, intranet, or documentation site. No account, no API key, no rate limits.

Will it always work?

We're committed to keeping the embed URLs stable. The iframe content is served from the same domain as the rest of our calculators, so if the main site is up, your embed works. We carry the public holiday data forward each year, so your embedded calculator stays accurate without any action on your part.

Can I customise the colours?

Not yet. You can pick a light or dark theme via the ?theme= query parameter, and the widget background is transparent so it inherits your page's background. Full colour customisation is on the roadmap. Contact us if you need a specific accent colour and we'll prioritise it.

Does the widget require JavaScript?

Yes. The widget is a self-contained iframe that loads our calculator UI; the calculator itself needs JavaScript to compute results, the same as on our main site.

Can I remove the attribution link?

The small 'Powered by BusinessDayCalculator.org' link at the bottom of the iframe is part of the free embed. Keeping it visible is how we fund continued development, so please don't hide it via CSS or by clipping the iframe.