Business Days Calculator
Count working days between two dates, add or subtract business days from any date, and exclude public holidays — all in one tool.
Business Days = Total Days − Weekends − Excluded Days
Result = Start Date ± N Business Days
Net Days = Business Days − Public Holidays in range
How to Use the Business Days Calculator
Why Use Our Business Days Calculator?
Business Days Only
Counts only your configured working days — excludes weekends automatically.
Custom Work Week
Supports Mon–Fri, Mon–Sat, Mon–Thu, or any custom combination of days.
Holiday Exclusion
Add any number of public holiday dates to exclude from the working day count.
Add / Subtract Days
Find the exact business date N working days before or after any start date.
All Devices
Fully responsive — works perfectly on phones, tablets, and desktops.
100% Private
No data sent to servers. All calculations run locally in your browser.
Frequently Asked Questions
Business Days Calculator
A contract that says "delivery within 15 business days" doesn't mean 15 calendar days, and treating it that way is one of the more common scheduling mistakes people make. Weekends don't count, and depending on the calendar, neither do public holidays — which means a 15-business-day window can easily stretch across three full calendar weeks rather than two.
A business days calculator handles that gap directly. Enter a start date and an end date, and it returns the actual working-day count after removing weekends and, optionally, holidays — rather than leaving you to cross days off a calendar by hand.
The Formula Behind the Count
The underlying math has three parts: Business Days = Total Days − Weekend Days − Holidays. Total days is simply the calendar span between the two dates, weekend days counts every Saturday and Sunday in that range, and holidays subtracts any public or company holidays that fall on what would otherwise be a working day.
This is the same logic behind Excel's NETWORKDAYS function, which most spreadsheet users reach for when they need this exact calculation: it returns the number of whole working days between two dates, automatically excluding weekends and any dates listed as holidays.
Real Example: A Project Deadline
Say a project runs from Monday, March 2 to Friday, March 20. That's 19 total calendar days, including both endpoints. Within that stretch, there are two full weekends — 4 weekend days — and no US federal holidays fall in the range. Working through the formula: 19 total days minus 4 weekend days minus 0 holidays leaves 15 business days.
Extend that same project by a few weeks into January instead, and the count changes again — Martin Luther King Jr. Day, observed on the third Monday of January, would remove one more working day from the total, even though the calendar span looks similar on paper.
How Holidays Get Handled
Fixed-date holidays create an extra wrinkle when they land on a weekend. US federal practice observes a Saturday holiday on the preceding Friday, and a Sunday holiday on the following Monday — so if July 4th falls on a Saturday, the actual day off (and the day excluded from a business-day count) is Friday, July 3rd.
- Weekends only — counts every weekday, including holidays, as a working day
- Weekends plus holidays — the more common default, excluding both from the count
- Custom holiday lists — needed for company-specific closures or holidays outside the standard federal calendar
Where "Business Days" Actually Comes Up
This calculation shows up constantly in situations where "days" alone would be misleading:
- Contract deadlines — "deliver within 10 business days" is a common clause in service agreements
- Shipping and SLAs — carriers frequently define handling time in business days, excluding weekends from delivery estimates
- Payroll and HR — calculating accrued benefits or notice periods often depends on working days rather than calendar days
- Legal filings — courts and government agencies sometimes specify deadlines in business days with their own observed-holiday rules
One limitation worth naming directly: this calculator follows the standard Monday-through-Friday definition of a business day and common holiday conventions, but the exact definition can vary by company, industry, and country. Always check the specific wording of a contract, court rule, or company policy rather than assuming the default applies.
Frequently Asked Questions
How do I calculate business days between two dates?
Count the total calendar days between the two dates, subtract the number of Saturdays and Sundays in that range, then subtract any holidays that fall on a weekday. This is the standard way to calculate business days without manually crossing days off a calendar.
What's the difference between a business days calculator and a regular days calculator?
A regular days calculator counts every calendar day in a range. A working days calculator removes weekends — and usually holidays — from that same range, since only weekdays typically count as active business time.
Does this calculator account for public holidays?
Yes, when the holiday-exclusion option is used. Because holiday calendars vary by country and even by company, it's worth confirming the specific holiday list matches your situation rather than assuming a single default applies everywhere.
How many business days are in a typical year?
A standard year has around 260 to 262 weekdays, and subtracting roughly 10 to 11 recognized public holidays generally brings the total to somewhere near 250 business days, depending on the specific year and country.
Should the start and end date both be counted?
This depends on convention — some contexts count both endpoints (inclusive), while others count only the days strictly in between. Reading the specific wording of a deadline or agreement is the most reliable way to know which applies.
Related Tools and Resources
A few related tools cover situations just outside a straightforward business-day count.
Use Days Between Dates if you need the raw calendar-day count without excluding weekends or holidays.
Try a Days Until Calculator if you're counting down to a single future deadline rather than measuring a fixed range.
A Work Hours Calculator is the better fit once you need actual hours worked within those business days, not just a day count.
Use a Shift Calculator if you're planning coverage across working days rather than counting them after the fact.
Reach for a Meeting Planner if your business-day math needs to account for participants across different time zones.
Counting the Days That Actually Count
Calendar days and working days tell two different stories about the same stretch of time, and the gap between them is exactly where deadlines quietly slip. Knowing which one a contract, deadline, or SLA actually means — and getting the holiday list right — is what turns a rough estimate into a number you can plan around.
Reviewed by Kromo Tools Team
Building free, reliable online calculators and utilities for students, professionals, and everyday users. Last updated:
