What is a business day?
A business day is any day your team, company, or client treats as a working day. For many schedules that means Monday through Friday without public holidays, but this calculator can also model regional calendars, custom weekends, or alternative workweeks.
Business Day Rules
Start by choosing whether you want to define excluded weekend days or included working days directly. Then add optional holidays in YYYY-MM-DD format so the calculation matches your actual operating schedule.
- Select by: Weekend days / Working days
- Select which days are weekends.
- Select which days are working days.
- Holidays: Optional. Holidays on weekdays are excluded.
- Weekend holidays are already excluded by weekend settings.
Count Business Days
Use this panel when you need the working-day total for a date range. The breakdown helps you verify the result by separating business days, total days, weekends, and holidays that fall on weekdays.
- Start date / End date
- Include start/end dates
- Business days
- Total days
- Weekend days
- Holidays (weekdays)
Add/Subtract Business Days
Use this panel when you already know the base date and need a due date, follow-up date, or SLA target. It applies the same weekend and holiday rules as the range calculator, so both calculations stay aligned.
- Base date
- Business days
- Count start date as day 1
- Add / Subtract Date