Business Days Calculator
Count the business days between two dates, or add business days to a date. A business day is Monday to Friday that is not a US federal holiday, and you can switch the holidays off.
Result date
- ISO date
- Weekday
The counted dates d satisfy start < d ≤ end: the start date is left out and the end date is included. A date counts when it is Monday to Friday and, with the box ticked, not an observed federal holiday. In add mode, the result is the earliest date r where the business days in (start, r] equal the number you entered; adding 0 returns the start date.
Example: November 9 to December 25, 2026 has 34 weekdays. Veterans Day (Wednesday, November 11), Thanksgiving (Thursday, November 26) and Christmas Day (Friday, December 25) are federal holidays, so there are 31 business days. With holidays off, the answer is 34.
Federal holidays this calculator skips
The 11 holidays in 5 U.S.C. 6103. When a holiday falls on a Saturday, the observed day is the Friday before; when it falls on a Sunday, the observed day is the Monday after. Dates below are computed from the rules.
| Holiday | 2026 | 2027 | 2028 |
|---|---|---|---|
| New Year's DayJanuary 1 | Jan 1 | Jan 1 | Jan 1observed Dec 31 |
| Birthday of Martin Luther King, Jr.Third Monday of January | Jan 19 | Jan 18 | Jan 17 |
| Washington's BirthdayThird Monday of February | Feb 16 | Feb 15 | Feb 21 |
| Memorial DayLast Monday of May | May 25 | May 31 | May 29 |
| Juneteenth National Independence DayJune 19 | Jun 19 | Jun 19observed Jun 18 | Jun 19 |
| Independence DayJuly 4 | Jul 4observed Jul 3 | Jul 4observed Jul 5 | Jul 4 |
| Labor DayFirst Monday of September | Sep 7 | Sep 6 | Sep 4 |
| Columbus DaySecond Monday of October | Oct 12 | Oct 11 | Oct 9 |
| Veterans DayNovember 11 | Nov 11 | Nov 11 | Nov 11observed Nov 10 |
| Thanksgiving DayFourth Thursday of November | Nov 26 | Nov 25 | Nov 23 |
| Christmas DayDecember 25 | Dec 25 | Dec 25observed Dec 24 | Dec 25 |
Rules and observance: 5 U.S.C. 6103 and the US Office of Personnel Management federal holidays page. Inauguration Day (January 20, Washington DC area only, every fourth year) is not skipped. This is the federal government calendar, not the Federal Reserve, banks, schools or any state, whose holidays can differ. Check any legal or contractual deadline against the official source.
Business day questions
Is the start date counted?
No. If you start on Monday and count 1 business day, the answer is Tuesday. The end date is counted when it is a business day.
What if the end date is before the start date?
The two dates are swapped and a note says so. The count is the same either way.
Does it skip state holidays or bank holidays?
No. It uses the US federal holiday calendar only. Banks, courts, schools and states can observe different days, so check the rules that apply to you.