Business Day Calculator Widget

How it works

A business day calculator counts only weekdays – Monday to Friday – between two dates. Weekends are automatically excluded, which makes the difference between a result of 5 calendar days and 5 business days significant when a start date falls near a weekend.

For example: adding 5 business days to a Friday date gives the following Thursday, because Saturday and Sunday are skipped. Adding 5 calendar days to the same Friday gives the following Wednesday.

Common scenarios where this matters:

• Delivery estimates: e-commerce shipping windows are usually quoted in business days
• Invoice payment terms: Net 30 means 30 calendar days to most businesses, but some contracts specify business days
• Project timelines: when teams work Monday—Friday, calendar-day estimates overstate available working time
• HR and payroll: notice periods, grievance responses and statutory deadlines often run in business days

Business days vs calendar days: a standard date calculator counts every day equally. If you need to exclude weekends and public holidays, a business day calculator is the right tool. For UK public holidays specifically, you need a calculator that supports a holiday calendar – this widget works on a plain Monday—Friday basis.

How to add business days in other tools: in Excel use WORKDAY(start_date, days). In Google Sheets, the same function works. In Python with Pandas: pandas.bdate_range(start, periods=days).

Embedding tip: the widget shows only the result your visitor needs – the embed is self-contained and needs no external configuration once pasted in. Set the accent colour to match your site before copying the iframe code.

How to add it