This business days calculator counts working days, meaning weekdays excluding weekends and optionally excluding US federal holidays, between any two dates. It also runs the other direction: start from a date and add a number of business days to find a deadline.
Business-day maths is where contracts, shipping estimates, court filings and payroll all get their deadlines, and it is easy to get wrong by hand because holiday observance shifts. When July 4 lands on a Saturday, the federal observance moves to Friday July 3, which silently removes a working day from that week.
If you are here because a company told you something would take a number of business days, the table below converts the common promises into actual calendar dates.
How Long Is 3 Business Days? A Conversion Table
The reason "3 business days" feels unpredictable is that its length in calendar days depends entirely on which day the clock starts. From a Monday it is 3 calendar days, but from a Wednesday it is 5, because the weekend falls inside the window.
So the honest answer to how long 3 business days is: 3 calendar days if it starts early in the week, 5 if it starts on a Wednesday, Thursday or Friday.
The multiples of 5 are the clean ones. 5 business days is exactly 7 calendar days from any weekday start, and 10 business days is exactly 14. That is why so many policies are written as 5 or 10 rather than 6 or 8.
Ranges work the same way. "3 to 5 business days" from a Friday means the following Wednesday through Friday, so 5 to 7 calendar days. "7 to 10 business days" from a Monday means 9 to 14 calendar days, which is most of a fortnight.
| Promised | Starting Monday | Starting Wednesday | Starting Friday | Calendar days |
|---|---|---|---|---|
| 1 business day | Tuesday | Thursday | Monday | 1 to 3 |
| 2 business days | Wednesday | Friday | Tuesday | 2 to 4 |
| 3 business days | Thursday | Monday | Wednesday | 3 to 5 |
| 4 business days | Friday | Tuesday | Thursday | 4 to 6 |
| 5 business days | next Monday | next Wednesday | next Friday | exactly 7 |
| 7 business days | Wednesday | Friday | Tuesday | 9 to 11 |
| 10 business days | Monday, 2 weeks on | Wednesday, 2 weeks on | Friday, 2 weeks on | exactly 14 |
Counting starts the next business day, which is the standard convention. Holidays are not included in this table and each one pushes the date out by a further day. The pattern is worth remembering: any multiple of 5 business days lands on the same weekday, so 5 is always exactly a week and 10 is always exactly a fortnight.
Is Saturday a Business Day?
No. In standard US usage business days are Monday to Friday, and Saturday and Sunday are not business days for banking, contracts, shipping deadlines or legal filings.
The confusion comes from delivery, because some carriers operate on Saturdays without counting them as business days:
- USPS delivers on Saturdays, but Saturday is not a business day for its service commitments
- UPS and FedEx offer Saturday delivery as an add-on service in many areas, again not counted as a business day by default
- Banks are closed, and ACH transfers do not settle. A transfer initiated Friday afternoon typically posts Monday or Tuesday
So a package can arrive on a Saturday while that Saturday still does not count toward a "5 business day" promise. Both things are true at once.
For shipping specifically, business days are the days the carrier processes and moves your package, which is why a Friday order with a 5-to-7-business-day estimate can easily be 9 to 11 calendar days out. Two weekends fall inside it.
Sunday is never a business day in any of these contexts.
How Many Business Days in a Year and a Month?
The figures worth keeping:
- A week has 5 business days
- A month averages 21.75 weekdays, so 21 to 22 is the right planning number, and 20 to 23 is the full range depending on layout
- A year has 261 weekdays, or 260 in some years, and about 250 business days after federal holidays
- A full-time work year is 2,080 hours, which is 260 days of 8 hours
The gap between 261 weekdays and 250 business days is the 11 federal holidays. Note that many private employers do not observe all eleven, with Columbus Day and Veterans Day the most commonly worked, so your own working year may be 252 to 255 days.
For project planning, the trap is December and January. A 10-working-day task starting mid-December can span three calendar weeks once Christmas and New Year land inside it, which is roughly double the length the same task takes in March.
| Year | Weekdays | Weekday holidays | Business days |
|---|---|---|---|
| 2025 | 261 | 11 | 250 |
| 2026 | 261 | 11 | 250 |
| 2027 | 261 | 11 | 250 |
All three years land on 250 because each has 261 weekdays and all 11 federal holidays fall on weekdays after observance shifting. Years where holidays cluster on weekends can reach 252, since a Saturday holiday observed on the preceding Friday still removes only one weekday.
What Is a Business Day?
A business day is a day when normal commercial operations run: Monday to Friday, excluding public holidays. What varies is which holiday set applies.
- Banking: banks follow the Federal Reserve calendar, which matches the 11 federal holidays
- Shipping: carriers publish their own calendars, and most skip the major federal holidays but work some of the minor ones
- Courts: each court system has its own holiday calendar, and some state courts close on days the federal government works. Verify locally when a filing deadline matters
- Employers: entirely at the company’s discretion, and many observe fewer than 11
- International: definitions differ, and in parts of the Middle East the working week runs Sunday to Thursday, so Friday and Saturday are the weekend
The other thing to pin down is whether day one counts. The standard convention is that counting starts the next business day, so a request made Monday with a 5-business-day window is due the following Monday rather than Friday. Contracts sometimes define it the other way, and that single choice moves every answer by a day, which is why this calculator makes it an explicit option.
The 11 US Federal Holidays
Fixed-date holidays, shifted to Friday or Monday when they fall on a weekend:
- New Year’s Day, January 1
- Juneteenth, June 19
- Independence Day, July 4
- Veterans Day, November 11
- Christmas Day, December 25
Floating holidays, always on a weekday by definition:
- Martin Luther King Jr. Day, third Monday of January
- Washington’s Birthday, third Monday of February
- Memorial Day, last Monday of May
- Labor Day, first Monday of September
- Columbus Day, second Monday of October
- Thanksgiving, fourth Thursday of November
The observance rule matters more than people expect. A holiday falling on a Saturday is observed the preceding Friday, and one falling on a Sunday is observed the following Monday. So when July 4 is a Saturday, Friday July 3 stops being a business day, and a deadline calculated without that adjustment comes out a day early.
If your context uses a different holiday set, switch holidays off in the calculator and subtract your own.
Frequently Asked Questions
How long is 3 business days?
Between 3 and 5 calendar days, depending on when it starts. From a Monday, 3 business days is Thursday, so 3 calendar days. From a Wednesday it is the following Monday, so 5 calendar days, because the weekend falls inside the window. Each holiday pushes it out by another day.
How long is 5 business days?
Exactly 7 calendar days from any weekday start, so 5 business days from a Monday is the following Monday. Any multiple of 5 business days lands on the same weekday, which is why so many policies are written as 5 or 10 rather than 6 or 8. Holidays add a day each.
How long is 7 to 10 business days?
From a Monday, that is 9 to 14 calendar days, landing between the Wednesday of the following week and the Monday two weeks on. From a Friday it is 11 to 16 calendar days. Holidays inside the window extend it further, so the upper end is the realistic expectation in December.
Is Saturday a business day?
No. Business days are Monday to Friday in standard US usage, for banking, contracts, shipping commitments and legal deadlines. USPS delivers on Saturdays and UPS and FedEx offer it as an add-on, but none of them count Saturday as a business day, so a package can arrive on a Saturday that still does not count toward the promise.
Is Sunday a business day?
No. Sunday is not a business day in any standard US context. Banks are closed, ACH transfers do not settle, and carriers do not count it toward service commitments even where limited Sunday delivery exists.
What are business days in shipping?
The days the carrier processes and moves your package, which is Monday to Friday excluding their published holidays. A Friday order with a 5-to-7-business-day estimate is typically 9 to 11 calendar days out, because two weekends fall inside the window.
How many business days are in a year?
About 250 in the US. A year has 261 weekdays, or 260 in some years, and the 11 federal holidays remove 11 more. 2025, 2026 and 2027 each work out to exactly 250. Many private employers observe fewer than 11 holidays, so your own working year may be 252 to 255 days.
How many work days in a month?
An average of 21.75, so 21 to 22 is the right planning figure. The same answer covers how many working days in a month and how many business days in a month, since all three phrasings describe weekdays minus holidays. The full range is 20 to 23 weekdays depending on how the month falls, minus any holidays inside it. February in a non-leap year starting on a weekend gives the fewest.
Is today counted when someone says within 5 business days?
Almost always no. The convention starts counting the next business day, so a request made Monday is due the following Monday rather than Friday. Contracts occasionally define it the other way, which is why this calculator lets you include or exclude the start date explicitly.
Do business days include holidays?
No. Most workplaces, banks and shippers skip federal holidays, so this calculator excludes them by default. Observance matters: a holiday falling on a Saturday is taken on the preceding Friday, and one falling on a Sunday on the following Monday, and that Friday or Monday stops counting.
What days are considered business days?
Monday through Friday, excluding public holidays. Which holidays apply depends on context: banks follow the Federal Reserve calendar of 11 federal holidays, carriers publish their own, and courts have separate calendars that sometimes close on days the federal government works.