Embed and Link to BusinessDayCalculator.org
Last reviewed: October 14, 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. 18 of the calculators are available as drop-in widgets, and the date calculators among them use the public holidays of the country the reader picks, from 25 countries. The full site adds 88 sub-national holiday calendars.
Here is the part that matters if you write about deadlines or payment terms. The holidays 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
By use case
If you run a site in one of these niches, start here. Each page pairs a single widget with the way your readers would actually use it, including where on your site it fits and a short FAQ for that audience.
Net 30 calculator for accounting blogs
Let readers check an invoice due date inline, counted in calendar days or in business days with the holidays removed.
SLA deadline calculator for support teams
Turn a response or resolution target into a real date, business days only, custom weekends included.
Working hours calculator for project management
Convert a date range into the hours a team actually has, weekends and holidays removed.
Time zone overlap calculator for remote teams
Show the window where two zones are both online, with daylight saving handled for each side.
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.
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 sourced public holiday data and their own working week, including the Friday-Saturday weekend of Egypt, Qatar and Saudi Arabia.
88
sub-national holiday calendars on the site, in United States, United Kingdom, Canada, Australia, Germany, Spain and Switzerland.
3
languages: English, German, and Spanish.
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. The figures in them are read from the site's own data, so they stay current.
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 88 sub-national regions.
Long (about 70 words)
BusinessDayCalculator.org is a free set of business day and deadline calculators for invoicing, project, 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 88 sub-national jurisdictions, with each country's own working week applied automatically. No account and no API key.
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.
Kept apart from your page
Each widget is a page prerendered in advance and served as a static file, so nothing is computed on our server when your reader opens it.
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.
Sources for these rules
- Royal Order: Weekly Holiday on Friday and Saturday (23 June 2013) (Saudi Press Agency)
- Emiri Decision No. 57 of 2025 on working days and official holidays (Al Meezan, the Qatari Legal Portal)
- Circular No. 1 of 2006 unifying the weekly holiday on Friday and Saturday (archived copy) (Egyptian Government Portal)
Checked October 9, 2026. All sources