Business Days Calculator
Calculate business days between two dates, excluding weekends and holidays. Essential for project planning and deadlines.
Calculate Business Days
How the Calculation Works
How It Works: The calculator counts working days (Monday-Friday) between two dates, excluding weekends (Saturday and Sunday). Some versions also allow excluding holidays you specify.
For example, 14 calendar days often equals about 10 business days when weekends are excluded. This is crucial for realistic project planning and deadline calculations.
Worked Example
Example: From Monday, September 1, 2026 to Friday, September 18, 2026:
- Calendar Days: 18 days
- Business Days: ~13 days (excluding 2 weekends)
- Weekends Excluded: 4 weekend days (Sat and Sun)
This shows that a two-week period is actually only 10 business days, an important distinction for project deadlines.
How to Use This Calculator
Why Business Days Matter: Project timelines, delivery estimates, and deadline calculations typically refer to business days, not calendar days. A "10-business-day delivery" means 10 working days, which could span 14 calendar days if weekends are included.
Holiday Considerations: Beyond weekends, many calculators allow you to exclude specific holidays. A project deadline of "20 business days" around Thanksgiving might actually need 25 calendar days to account for the holiday.
Global Time Zones: Business days vary by country/region. Some countries have different weekend days or additional holidays. This calculator typically uses Monday-Friday as business days.
Frequently Asked Questions
What are business days?
Business days are Monday through Friday (weekdays), excluding weekends (Saturday and Sunday). They represent working days in most offices and businesses.
How many business days are in a month?
A typical month has about 20-22 business days, depending on how many weekends fall within the month. September 2026 has 22 business days.
Should I count holidays as business days?
No. If a holiday falls on a weekday, it's typically not counted as a business day. Check your calculator—some allow you to exclude specific holidays.
How do I calculate business days between two dates?
Use this calculator. Enter your start and end dates, and it will show calendar days, business days, and weekends separately.
Why is this important for deadlines?
When someone says a project is due in "10 business days," they mean 10 working days, not 10 calendar days. The actual calendar duration is longer because weekends aren't counted.