Two questions, one calculator
'How many business days between these dates?' and 'What date is N business days from now?' are the same arithmetic run in opposite directions. Both skip Saturdays and Sundays and, if you tick the option, US federal holidays observed on weekdays. The count excludes the start date and includes the end date by default — the reading used for 'within 10 business days' deadlines — and can include both ends for 'how many working days does this project span'.
The tables use September 10, 2026 as the start.
| Range | Calendar days | Weekdays | Excluding US holidays |
|---|---|---|---|
| September 10, 2026 → September 17, 2026 | 7 | 5 | 5 |
| September 10, 2026 → September 24, 2026 | 14 | 10 | 10 |
| September 10, 2026 → October 10, 2026 | 30 | 21 | 21 |
| September 10, 2026 → November 9, 2026 | 60 | 42 | 41 |
| September 10, 2026 → December 9, 2026 | 90 | 64 | 61 |
| September 10, 2026 → March 9, 2027 | 180 | 128 | 121 |
Adding business days to a date
Ten business days is two calendar weeks when no holiday intervenes; holidays push the date out a day each. Shipping estimates, court filing deadlines and payment terms ('net 10 business days') all work this way. Negative numbers count backwards.
| Business days | Date (weekends only) | Date (also skipping US holidays) |
|---|---|---|
| 1 | September 11, 2026 | September 11, 2026 |
| 3 | September 15, 2026 | September 15, 2026 |
| 5 | September 17, 2026 | September 17, 2026 |
| 10 | September 24, 2026 | September 24, 2026 |
| 20 | October 8, 2026 | October 8, 2026 |
| 30 | October 22, 2026 | October 23, 2026 |
| 60 | December 3, 2026 | December 8, 2026 |
US federal holidays, 2026
Eleven federal holidays, as listed by the US Office of Personnel Management (OPM) under 5 U.S.C. 6103. When one falls on a Saturday it is observed on the Friday before; on a Sunday, the Monday after (5 U.S.C. 6103(b) and Executive Order 11582). The calculator uses the observed dates. For past years it applies each holiday only from the year it became a federal holiday — Juneteenth from 2021 (Pub. L. 117-17), Martin Luther King Jr. Day from 1986 — and the Monday dates of the Uniform Monday Holiday Act from 1971. Inauguration Day, a holiday only for federal employees in the Washington, DC area, is not included. Many private employers observe fewer (Columbus Day and Veterans Day are often working days) and some add the day after Thanksgiving or Christmas Eve, so check your own calendar for contract deadlines.
| Holiday | Date | Observed |
|---|---|---|
| New Year's Day | January 1, 2026 | — |
| Martin Luther King Jr. Day | January 19, 2026 | — |
| Washington's Birthday (Presidents' Day) | February 16, 2026 | — |
| Memorial Day | May 25, 2026 | — |
| Juneteenth | June 19, 2026 | — |
| Independence Day | July 4, 2026 | July 3, 2026 |
| Labor Day | September 7, 2026 | — |
| Columbus Day | October 12, 2026 | — |
| Veterans Day | November 11, 2026 | — |
| Thanksgiving | November 26, 2026 | — |
| Christmas Day | December 25, 2026 | — |
Working days in a year
A year has 260 or 261 weekdays depending on where the weekends fall, and about 250 working days after federal holidays. The count uses the holidays observed on weekdays inside the calendar year: 2027 has twelve, because New Year's Day 2028 falls on a Saturday and is observed on Friday, December 31, 2027, and 2028 has ten for the same reason. That figure is the basis for converting an annual salary to a daily rate and for calculating leave entitlements.
| Year | Weekdays | After federal holidays observed that year |
|---|---|---|
| 2025 | 261 | 250 |
| 2026 | 261 | 250 |
| 2027 | 261 | 249 |
| 2028 (leap) | 260 | 250 |
Deadlines and conventions
Legal and commercial deadlines specify their counting rules. US federal court rules (FRCP 6) count every day including weekends for periods stated in days, but if the last day is a weekend or holiday the deadline moves to the next business day. Payment terms like 'net 30' are calendar days; 'business days' in shipping means the carrier's working days, which may exclude Saturday for some services and include it for others. When a deadline matters, confirm which convention applies; the calculator gives both the weekday-only and holiday-adjusted answers so either can be checked.
Other countries and custom holidays
The built-in holiday set is US federal. For other countries, or for a company calendar, count weekdays only and subtract your own holidays that fall on weekdays; the day counter's weekday count is the same starting point. In countries with a Friday–Saturday or Thursday–Friday weekend the weekday assumption itself changes and a manual adjustment is needed.