Embed and Link to BusinessDayCalculator.org
Last reviewed: May 19, 2026
BusinessDayCalculator.org is a free set of business day and deadline calculators for people who count working days, set invoice and SLA deadlines, and plan across countries. There are 18 calculators, each available as a drop-in widget, and all of them carry public holiday data for 25 countries and 86 sub-national jurisdictions.
Here is the part that matters if you write about deadlines or payment terms. Most competing tools make the reader type in holidays by hand, or skip them and quietly count weekends only. Ours are built in, set per country, and carried forward each year. A reader on your page gets the correct date for Brazil or Japan without you maintaining a holiday list, and the embed stays right next January with no work on your side.
See the widgets in action
These are live embeds, not screenshots. They are the same iframes you would paste into your own page. Try them, then build any of the 18 calculators with the embed generator.
Business Days Between Dates
Net 30 Calculator
SLA Deadline Calculator
Why link to or embed us
The offer is simple, and we say the trade up front. You get a working calculator on your page: free, no account, no payment, no API key. We keep the public holiday data current and carry it forward each year, so the embed stays accurate without you touching it. In return, the snippet shows a small visible credit line under the widget that links back to the matching calculator on our site.
That credit link is the whole deal, and we will not pretend otherwise. It is how the tools stay free, so please keep it visible rather than clipping it or hiding it with CSS. If you would rather just link to a calculator from your article text, that is welcome too, and there is nothing extra to display.
For context, the site is just over a month old and already serves roughly 2,500 visitors a week (Vercel Analytics), growing week over week even before Google has fully indexed it.
What is covered
18
calculators, each available as a free embeddable widget: business-day math, Net 30/60/90, invoicing, SLAs, late-payment interest, working hours, and leave planning.
25
countries with verified public holiday data and the correct working week, including Friday-Saturday and Sunday-Thursday weekends, not just Monday-Friday.
86
sub-national jurisdictions: US states, Canadian provinces, Australian states and territories, UK nations, German Länder, Spanish autonomous communities, and Swiss cantons.
3
languages live now: English, German, and Spanish. French, Italian, and Japanese are rolling out.
Want proof of how this compares with spreadsheets and other date tools? See the alternatives and comparisons.
Descriptions you can copy
If you need a line for a tools roundup or a resource page, use one of these as-is. They are accurate and free of marketing fluff.
Short (about 15 words)
BusinessDayCalculator.org: free business day and deadline calculators with built-in public holidays for 25 countries.
Medium (about 35 words)
BusinessDayCalculator.org is a free set of business day and deadline calculators. Count working days, find invoice due dates, and set SLA windows, with public holiday data built in for 25 countries and dozens of sub-national regions.
Long (about 70 words)
BusinessDayCalculator.org is a free set of business day and deadline calculators built for invoicing, project, legal, and operations work. It counts working days between dates, adds or subtracts business days, and computes Net 30/60/90, SLA, and payment deadlines. Public holiday data is built in for 25 countries and 86 sub-national jurisdictions, with each country's real working week applied automatically. No account, no API key, and the holiday data is carried forward every year.
Brand and assets
The brand name is the text BusinessDayCalculator.org. Please write it that way rather than abbreviating it. Two assets are available if you need a mark or a card image:
- Logo mark (SVG) for favicons and small inline use.
- Open Graph card (PNG, 1200x630) for link previews and roundups.
Built to score well on your page
An embed should not drag down your Core Web Vitals. Every calculator is a static, prerendered page with no heavy framework loaded just to show a widget, so it paints fast and gets out of the way. On a mobile Lighthouse run, the calculator pages land in the mid-to-high 90s for performance, and the markup is built for accessibility: one clear heading per page, labelled form controls, and full keyboard support.
The widget loads inside its own iframe, so its styles and scripts never reach the rest of your page. You keep your layout, your fonts, and your performance budget.
Get started or get in touch
Build a widget with the embed generator, compare us against other tools on the alternatives pages, or send a press or partnership note through contact.