Business days calculator

What a business day is

A business day is a day on which normal offices are open: in most countries, Monday to Friday except public holidays. That is the definition this calculator starts from. It is a convention and not a universal law. A shipping company, a bank, a court and a stock exchange can each use a different list, and the term may be defined in a contract. “Working day” usually means the same, although some employers and countries also treat Saturday as one.

How the count works

The calculator treats the start date as day zero and walks forward one date at a time. Each date that is not a weekend day and not on the chosen holiday list adds one to the count. When the count reaches your number, that date is the answer. Going backwards works the same way in reverse.

A start date on a weekend or a holiday does not count, because it was already day zero. The first day counted is the next working day. That gives the result people usually expect: an order placed on a Saturday with “2 business days” handling is ready on Tuesday.

Two worked examples

Thanksgiving week. Five business days after Friday, November 20, 2026 is Friday, November 27, 2026 when only weekends are skipped. With United States federal holidays it becomes Monday, November 30, 2026, because Thanksgiving falls inside the span.

The end of the year. Ten business days after Monday, December 20, 2027 is Monday, January 3, 2028 with weekends only. With United States federal holidays it is Wednesday, January 5, 2028. Christmas 2027 falls on a Saturday, so its federal holiday is observed on Friday December 24; New Year’s Day 2028 also falls on a Saturday, so it is observed on Friday December 31. Both weekend holidays still remove a working day from the count, which is exactly what a rule of thumb misses.

Working days per year and month

These counts use the official national lists and a Saturday and Sunday weekend. They are useful for capacity plans, payroll estimates and salary-to-day-rate conversions.

United States federal working days by month

Where the weekend differs

Saturday and Sunday are not the weekend everywhere. Unicode’s CLDR locale data lists Friday and Saturday as the weekend in Bahrain, Algeria, Egypt, Israel, Iraq, Jordan, Kuwait, Libya, Oman, Qatar, Saudi Arabia, Sudan, Syria and Yemen, and Thursday and Friday in Afghanistan. CLDR records the common locale convention rather than what any given employer does, so choose the setting that matches the office you are counting for. If your work crosses regions, remember that a five-day overlap between a Sunday-to-Thursday office and a Monday-to-Friday office shrinks to four shared days a week.

Holidays: what is and is not included

The holiday sets come from official sources, such as the US Office of Personnel Management for federal holidays and GOV.UK for UK bank holidays. A few details change results:

• Observed days. A US federal holiday on a Saturday is observed on the Friday before it, and one on a Sunday on the Monday after it. UK bank holidays on a weekend move to a substitute weekday. The tool uses the day actually taken off.
• National scope. “United States (federal)” means federal holidays only. Many private employers work on some of them, and states add their own. Spain and France have regional days we do not include, and Germany’s national list has one day, German Unity Day, since other holidays are set by each state.
• The US, Canada, the UK and Australia split by region. Scotland and Northern Ireland have their own lists, and so do Australian states. Pick the most specific set available.
• Announced dates. Holidays that follow a lunar calendar are set by government announcement. Where no date has been published, the tool cannot skip them, and it notes when the data ends.

Deadlines: business days against calendar days

Many deadline rules are written in calendar days, and those count weekends. A “30-day” period is not 30 business days, which is about six weeks. Read the words carefully and use the matching tool: the date calculator for calendar days, this page for business days.

Legal rules often combine the two. Under Rule 6(a)(1) of the US Federal Rules of Civil Procedure, for a period stated in days, you exclude the day of the event, count every day including weekends and legal holidays, include the last day, and if the last day is a Saturday, Sunday or legal holiday the period runs until the end of the next day that is none of those. So that rule counts calendar days and uses business days only to fix the end. State courts, other countries and other kinds of proceedings have their own rules. This page is a counting aid. It is not legal advice, and it does not know the rule that applies to your case.

Three more traps are worth knowing:

• Hour-based deadlines. “48 hours” from Tuesday morning ends Thursday morning, weekends or not, unless the rule says working hours. Use the time calculator for those.
• Cut-off times. An order placed after a daily cut-off is often treated as received the next working day. Move your start date forward if yours is.
• Time zones. Office hours in Tokyo and New York do not overlap at all (9 a.m. in Tokyo is 7 or 8 p.m. the day before in New York), and a deadline “by end of business” needs a place attached to it. The time zone converter helps there.

In a spreadsheet

=WORKDAY(A1,10,holidays) gives the date 10 working days after A1, leaving out the start date, the same as the first calculator here. =NETWORKDAYS(A1,B1,holidays) counts working days between two dates and includes both ends, so tick “Count both dates” to compare it with the second calculator. WORKDAY.INTL and NETWORKDAYS.INTL take a weekend pattern for offices that don’t use Saturday and Sunday. The holiday range is your job in all of them, which is where most spreadsheet deadlines go wrong.

For a quick answer from today there are ready-made pages, such as 10 business days from today and 30 business days from today. For all the units of a span, see days between dates.