Business Days Calculator

Why Business Days Matter

Deadlines, delivery estimates, legal filings, and project timelines all run on business days — but counting them by hand is surprisingly error-prone once you cross month boundaries, hit a holiday weekend, or need to go 30+ business days out. This calculator counts the exact number of business days between any two dates, or adds a specified number of business days to a start date and returns the target date. It excludes weekends automatically and lets you exclude U.S. federal holidays (or custom holidays) for a precise count.

Quick example: A contract says “payment due within 10 business days.” Starting from Friday, November 20, 10 business days is not simply November 30. Counting forward and skipping weekends (and Thanksgiving), the actual deadline is Monday, December 7. Getting this wrong could mean a late payment, penalties, or breached contract terms.

How to Use the Calculator

Counting mode: Enter a start date and end date. The calculator returns the exact number of business days (Monday–Friday), excluding weekends and optionally excluding holidays. It also shows the total calendar days, the number of weekends skipped, and a breakdown of any holidays that fell within the range.

Add/subtract mode: Enter a start date and a number of business days. The calculator returns the target calendar date, skipping weekends and holidays. Use negative numbers to count backward — useful for determining when a countdown started or when a notice period began.

Holiday configuration: Toggle U.S. federal holidays on or off, or add custom non-working dates (company holidays, state holidays, office closures) for a tailored count. You can also configure whether the start date itself counts as day 1 or whether counting begins on the following business day — important for legal and contractual deadlines.

U.S. Federal Holidays (2026)

The calculator can automatically exclude these holidays, and it accounts for observed-date adjustments when a holiday falls on a weekend.

In 2026, the federal holidays are: New Year’s Day (January 1, Thursday), Martin Luther King Jr. Day (January 19, Monday), Presidents’ Day (February 16, Monday), Memorial Day (May 25, Monday), Juneteenth (June 19, Friday), Independence Day observed (July 3, Friday), Labor Day (September 7, Monday), Columbus Day (October 12, Monday), Veterans Day (November 11, Wednesday), Thanksgiving (November 26, Thursday), and Christmas Day (December 25, Friday).

When a holiday falls on a Saturday, the preceding Friday is typically observed as the federal holiday. When it falls on a Sunday, the following Monday is observed. Not all businesses observe all federal holidays — Columbus Day and Veterans Day, for example, are not universally observed by private-sector employers. The calculator lets you toggle individual holidays on or off to match your organization’s schedule.

Business Days vs. Calendar Days

A rough rule of thumb: 5 business days is approximately 7 calendar days (one full work week). But the actual conversion depends on where weekends and holidays fall within the range. A 10-business-day deadline starting on a Monday lands in exactly two calendar weeks. Starting on a Wednesday, it lands on a Monday three weeks out because of the partial first and last weeks.

Here are more precise reference conversions: 1 business day = 1–3 calendar days (1 if Mon–Thu, 3 if Friday), 5 business days = 7 calendar days, 10 business days = 14 calendar days, 20 business days = 28 calendar days (~1 month), 30 business days = ~42 calendar days (~1.5 months), 60 business days = ~84 calendar days (~3 months), 90 business days = ~126 calendar days (~4.5 months). The average year has approximately 252 business days (365 minus 104 weekend days minus ~9 holidays).

Common “Business Days From Today” Questions

People frequently search for specific business-day counts from the current date. The most common queries are: 5 business days from today (~1 calendar week), 10 business days (~2 weeks), 15 business days (~3 weeks), 30 business days (~6 weeks), and 90 business days (~4.5 months). The actual date depends on today’s day of the week and any holidays in the range — use the calculator for an exact answer rather than estimating.

Counting Business Days Across Countries

Business days are defined by the working week of the relevant country. The Monday–Friday standard applies in the United States, Canada, United Kingdom, European Union, Australia, Japan, and South Korea. However, many Middle Eastern countries including Saudi Arabia, UAE, Kuwait, and Qatar use a Sunday–Thursday work week, with Friday and Saturday as the weekend.

The UAE moved to a Monday–Friday federal workweek in 2022, though some private sectors still use Sunday–Thursday. If you are counting business days for international transactions, make sure you know which country’s working week applies to the deadline. This calculator defaults to the U.S. Monday–Friday standard but allows custom configuration.

Edge Cases the Calculator Handles

Start date on a weekend: If your start date is a Saturday or Sunday, counting begins on the next Monday. End date on a weekend: The calculator reports the count through the preceding Friday. Holiday on a weekend: Observed-date rules apply (Friday for Saturday holidays, Monday for Sunday holidays) so the holiday is effectively moved to a weekday without double-counting. Multi-year spans: The calculator handles date ranges spanning years or decades, correctly accounting for leap years, shifting holiday dates, and varying weekend counts. Negative business days: Enter a negative number to count backward from a date — useful for determining when a notice period began or when a deadline was originally set.