Business days calculator: count or add business days, skipping weekends and US federal holidays

• Count between two dates: both the start date and the end date are included by default. An included date counts as one business day if it is a Monday to Friday and not an observed federal holiday; untick either box to leave that date out. If the end date is before the start date the two dates are swapped.
• Add or subtract: the start date is never counted. Day 1 is the next business day after it (or the previous one when subtracting). With 0 the start date is returned unchanged.
• Which holidays: the federal holidays on the days OPM lists, January 1, 2026 to December 31, 2030. A date outside that range gives an error message; the days outside it are never counted as business days. With the weekends-only switch on, the range is 1900 to 2199.
• Not included: employer closures, state holidays, bank, stock market and postal calendars, and any rule that counts days by its own method.

OPM’s Federal Holidays page says:

The calculator skips the observed weekday and lists the calendar date next to it. OPM’s 2029 table notes that Inauguration Day, January 20, 2029, falls on a Saturday and that Federal employees in the Washington, DC, area are entitled to a holiday on the day a President is inaugurated; a Saturday is not a business day in this calculator either way.

Federal holidays are not the holidays of every bank, market or state. OPM’s list is for Federal employees; the Federal Reserve Banks, NYSE, state governments and employers each follow their own calendars, and those can differ from it, in either direction. This calculator does not apply them. FedRateCalc lists them separately: federal holidays 2026, bank holidays 2026 and stock market holidays; for one day at a time, are banks open today.

These 2026 dates show the difference, using the lists FedRateCalc’s stock market holidays and bank holidays pages hold:

Saturday, July 4, 2026 is a Saturday, so OPM’s list observes Independence Day on Friday, July 3, 2026. The same dates, counted two ways, and a short add, using the calculator’s code:

These are the dates the calculator skips. They match the tables on OPM’s Federal Holidays page for 2026 to 2030, as retrieved on November 1, 2026. A holiday that falls on a Saturday or Sunday is shown on its observed weekday, with the calendar date in the note.