Business days & deadlines
Working Days Calculator
Count working days between two dates or plan a deadline in business days, with clear control over weekends, holidays and your working week.
Work calendar
Monday–Friday schedule
7 September 2026 → 20 September 2026
Work calendar
Calculate working days
Count business days between dates or calculate a deadline using your working week, public holidays and custom closure dates.
Public holidays
Choose a country to automatically exclude public holidays. Select a region where regional holiday data is relevant.
Public holiday data powered by Calendarific. Local and employer-specific closures may not be included.
Add company shutdowns, annual leave, local holidays or any other date that should not count as a working day.
Result
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Choose your dates and settings, then calculate.
Calculation details
Understanding the calculation
Working days aren't always Monday to Friday
A working day calculator becomes useful when the calendar gets more complicated than simply counting dates. Weekends, public holidays, different working patterns and company closures can all change the number of days actually available for work.
What is a working day?
A working day is a day that forms part of your normal working schedule. The terms working day and business day are often used in the same way, although their exact meaning can depend on the workplace, country or context.
For many organisations this means Monday to Friday, excluding relevant public holidays. That isn't universal. Some businesses operate Saturdays, some employees work compressed or rotating schedules, and working weeks differ around the world.
Saturdays, Sundays and public holidays remain part of the total.
Non-working weekdays, relevant holidays and custom closures can be excluded.
How working days are calculated
CalcNest checks each date in the period against the working week you select. A date counts as a working day only when it falls on one of those selected weekdays and isn't excluded by a public holiday or a custom non-working date.
Monday 7 September to Sunday 20 September, using a standard Monday–Friday working week with both dates included.
The period contains 14 calendar days, but four of those dates are Saturdays or Sundays. With no additional holidays or closures, that leaves 10 working days.
Public holidays can change the answer
Public holidays are one reason two periods with the same number of calendar days can contain different numbers of working days. Holiday dates also vary by country and, in some places, by state, province or region.
When automatic public holidays are enabled, CalcNest can use the selected holiday calendar when deciding which otherwise-working dates should be excluded. If a holiday already falls on a day you've marked as non-working, it doesn't need to be deducted a second time.
Public-holiday databases can't know your employer's shutdowns, annual leave, rostered days off or every local closure. Add these as custom non-working dates when they affect your calculation.
Finding a deadline in working days
Sometimes you don't need the number of working days between two dates. Instead, you know the starting date and need to find the date that is a certain number of business days later or earlier.
That's what Deadline mode is for. For example, adding one working day to a Friday normally gives Monday when Saturday and Sunday are non-working days. If Monday is also an excluded public holiday, the deadline moves to the next eligible working day.
You can also choose whether the starting date itself should count when it qualifies as a working day. This is useful because different processes use different counting conventions.
When a working days calculator is useful
Business-day calculations appear in everyday planning more often than they first seem. The important part is using a working calendar that actually matches the situation you're calculating.
Estimate the usable working time between milestones rather than relying only on calendar days.
Translate a quoted number of business days into an estimated calendar date.
Compare a date range with the employee's actual working pattern and relevant closures.
Work with response periods, processing windows and business-day service targets.
How CalcNest handles your work calendar
Rather than assuming every user follows the same Monday–Friday schedule, the calculator lets you define which weekdays actually count. Automatic holidays and your own excluded dates are then applied to that schedule.
Does the date fall on one of your selected working weekdays?
Is an otherwise-working date excluded by the selected public-holiday calendar?
Have you identified the date as a personal, employer or local non-working day?
Don't rely on a general-purpose calculator as the sole basis for a legal, court, tax, immigration or contractual deadline. The formal definition of a “business day” can vary between rules and jurisdictions, and special closure or extension rules may apply. Check the governing document or relevant authority when a deadline has legal or financial consequences.
Frequently asked questions
Working days explained
Quick answers about business days, weekends, public holidays and working-day deadlines.
Enter your start and end dates, choose which weekdays count as working days, and decide whether to include the start and end dates. CalcNest then checks each date in the period and excludes your non-working weekdays, selected public holidays and any custom non-working dates you add.
They are often used to mean the same thing: days on which normal business or work takes place. However, the exact definition can depend on the organisation, country, contract or rule involved. That's why the calculator lets you customise the working week rather than assuming every user works Monday to Friday.
Yes, if Saturday and Sunday are not selected as working days. You aren't restricted to a standard Monday–Friday week, though. You can individually select or deselect any weekday to match your actual schedule.
Yes. Select a supported country and, where available, the relevant state or region. With public-holiday exclusion enabled, CalcNest uses that holiday calendar to exclude relevant holidays that would otherwise fall on one of your selected working days.
A holiday isn't deducted twice. If the holiday falls on a weekday you've already marked as non-working, that date already doesn't count as a working day. Where an official substitute or observed holiday is included in the selected holiday data, that separate date can be excluded when it falls on a working day.
Yes. Use the custom non-working dates option for company shutdowns, annual leave, rostered days off, local closures or other dates that shouldn't count. This is useful because a public-holiday database cannot know every workplace or personal schedule.
Select Find a deadline, enter today's date as the starting date, choose Add, and enter 10 working days. Adjust your working week and holiday settings if necessary, then calculate to find the resulting calendar date.
In deadline mode, counting normally begins after the starting date. If you enable Count starting date if working, the starting date can count as the first day when it qualifies under your selected workweek and isn't excluded by a holiday or custom non-working date.
Yes. The calculator supports automatic public-holiday data for countries including Australia, the United Kingdom and the United States. Regional options are available for supported locations, such as Australian states and territories, so you can choose a more relevant holiday calendar where available.
You can use it as a planning aid, but you shouldn't rely on a general-purpose calculator as the sole basis for a legal, court, tax, immigration or contractual deadline. The formal definition of a business day and the rules for holidays, closures or extensions can vary. Check the governing document or relevant authority when missing a deadline could have legal or financial consequences.
Working calendars vary between countries, employers and industries. Use the calculator settings that match the situation you're planning for.
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