Date math
Business Days Calculator
Count workdays between any two dates, with holiday exclusion for US, Korea, UK, Canada & Australia.
Mon–Fri 5 countries Holiday-aware
What is a Business Days Calculator?
A business days calculator counts the number of working days (Monday through Friday) between two dates, skipping weekends. Optionally, it can also skip recognized public holidays so you get a count of true working days.
This is the standard tool used in project management, legal deadlines, shipping estimates, payroll processing, and any situation where calendar days differ meaningfully from working days.
Example: Dec 15 → Jan 10 with US holidays excluded → around 18 business days — counting past Christmas, New Year's Day, and both weekends automatically.
How to Use This Calculator
Select a start date and an end date, then click Calculate Business Days. The result shows the total workday count plus a breakdown of total calendar days, weekend days, and (if enabled) holidays skipped.
Choose a country from the Exclude public holidays dropdown to subtract that country's public holidays from the count. Supported countries: United States, South Korea (대한민국), United Kingdom, Canada, and Australia. Use the quick-range buttons to jump to common periods like this week, this month, or the rest of the year.
The start date is included in the count; the end date is not — matching the most common business convention (e.g., "5 business days from today" starts counting from today). To verify which weekday a specific deadline falls on, use the Day of the Week Lookup; to identify the ISO week of a target deadline, see the Week Number Calculator.
Common Uses
- Project deadlines – Count how many working days until a deadline
- Shipping estimates – Convert "5–7 business days" to a calendar date
- Legal filings – Many legal deadlines are counted in court/business days
- Payroll cycles – Count workdays in a pay period
- Contract timelines – Determine response windows specified in business days
- HR and leave planning – Calculate available workdays in a period
Public Holidays by Country
United States (11 federal holidays)
- New Year's Day (January 1)
- Martin Luther King Jr. Day (3rd Monday in January)
- Presidents' Day (3rd Monday in February)
- Memorial Day (last Monday in May)
- Juneteenth National Independence Day (June 19)
- Independence Day (July 4)
- Labor Day (1st Monday in September)
- Columbus Day (2nd Monday in October)
- Veterans Day (November 11)
- Thanksgiving Day (4th Thursday in November)
- Christmas Day (December 25)
South Korea / 대한민국 (15 공휴일)
- 신정 New Year's Day (January 1)
- 설날 Lunar New Year (3 days)
- 삼일절 Independence Movement Day (March 1)
- 부처님 오신 날 Buddha's Birthday (Lunar April 8)
- 어린이날 Children's Day (May 5)
- 현충일 Memorial Day (June 6)
- 광복절 Liberation Day (August 15)
- 추석 Chuseok (3 days)
- 개천절 National Foundation Day (October 3)
- 한글날 Hangul Day (October 9)
- 크리스마스 Christmas (December 25)
United Kingdom (8 bank holidays)
- New Year's Day (January 1)
- Good Friday (varies)
- Easter Monday (varies)
- Early May Bank Holiday (1st Monday in May)
- Spring Bank Holiday (last Monday in May)
- Summer Bank Holiday (last Monday in August)
- Christmas Day (December 25)
- Boxing Day (December 26)
Canada (9 statutory holidays)
- New Year's Day (January 1)
- Good Friday (varies)
- Victoria Day (last Monday before May 25)
- Canada Day (July 1)
- Labour Day (1st Monday in September)
- National Day for Truth and Reconciliation (September 30)
- Thanksgiving (2nd Monday in October)
- Remembrance Day (November 11)
- Christmas Day (December 25)
Australia (8 national holidays)
- New Year's Day (January 1)
- Australia Day (January 26)
- Good Friday (varies)
- Easter Saturday (varies)
- Easter Monday (varies)
- ANZAC Day (April 25)
- Queen's Birthday (2nd Monday in June)
- Christmas Day (December 25)
- Boxing Day (December 26)
Frequently Asked Questions
How many business days are in a month?
Most months have between 20 and 23 business days. A month with 31 days and no major holidays landing on weekdays will have the most; February or any month with a Monday holiday will have fewer. Use the calculator to get an exact count for any specific month.
How do I calculate business days between two dates?
Count all days in the range, then subtract the number of Saturdays and Sundays that fall within it. For a 7-day week starting on Monday, there are always 2 weekend days. For ranges spanning multiple weeks, multiply full weeks by 5, then handle the partial week at each end. This calculator handles all of that automatically.
Does the calculator include the start and end dates?
The start date is included; the end date is not. This matches the standard business convention: "5 business days from Monday" means Mon, Tue, Wed, Thu, Fri — ending at Friday close, with the following Monday being day 6. If you need both dates included, add one to the result.
How many business days is 2 weeks?
Two calendar weeks (14 days) always contain exactly 10 business days when no public holidays are involved. With a holiday, it drops to 9 (or fewer if two holidays fall in the same two-week span).
What holidays are excluded?
Select a country to exclude its national public holidays: US (11 federal holidays), South Korea (15 holidays including Lunar New Year and Chuseok), UK (8 bank holidays), Canada (9 statutory holidays), or Australia (8 national holidays). State/provincial holidays and company-specific holidays are not included.
Why do different business day calculators give different answers?
The most common difference is whether the start date, end date, or both are counted. Some tools include both endpoints; others include neither; this calculator includes the start date only. The holiday set used also varies. Always check the convention a contract or legal deadline specifies if precision matters.