How this calculator works
Calendar days are the plain difference between the dates; choose whether to count the end date too (for example, a hotel stay doesn’t, but a vacation “from Monday to Friday” usually does). Business days count Monday to Friday and, if you choose, skip the 11 US federal holidays on the days they are observed — a Saturday holiday is observed on Friday and a Sunday holiday on Monday.
Calendar days = End − Start (+1 if the end date is included)
Business days = weekdays in the range − federal holidays observed on weekdays
Assumptions and tips
- Federal holiday rules follow 5 U.S.C. 6103. State and company holidays differ — banks also close on most federal holidays.
Worked example
Using the default values in the calculator above:
| Input | Value |
|---|---|
| Start date | 2026-11-02 |
| End date | 2027-01-04 |
| Include the end date | No (count the days in between) |
| Business days skip US federal holidays | Yes |
| Result | Value |
|---|---|
| Calendar days | 63 days |
| Business days | 41 days |
| Weeks and days | 9 weeks, 0 days |
| Months and days | 2 months, 2 days |
| Weekend days | 18 days |
| Federal holidays on weekdays | 4 days |
| Hours | 1,512 hours |
Step by step:
- Days = 2027-01-04 − 2026-11-02
- Business days = Monday–Friday in that range
- Then remove US federal holidays that fall on weekdays (observed dates)
Common mistakes to avoid
- Forgetting to decide whether the end date counts — it changes the answer by one day.
- Counting a holiday that falls on a Saturday as a day off on Saturday — it is usually observed on the Friday.
Frequently asked questions
How many days are there between two dates?
Enter both dates above. For example, November 2, 2026 to January 4, 2027 is 63 days.
How many business days is that?
With weekends and US federal holidays (Veterans Day, Thanksgiving, Christmas and New Year’s Day) removed, it is 41 business days.