Business Days Calculator
Count business days between dates, exclude weekends and custom holidays, or add and subtract working days.
Calculate Business Days
Choose a calculation mode and customize your non-working days.
Weekend Settings
Select the days that should be treated as non-working weekend days.
Default configuration excludes Saturday and Sunday. You can customize any day.
Custom Holidays
Add public holidays, company closures or other non-working dates.
Calculation Result
Business Day Summary
Business Days
Select your dates to calculate working days.
Calendar Days
0
Weekend Days
0
Holidays Excluded
0
Non-Business Days
0
Calculation Breakdown
Current Workweek Settings
Saturday and Sunday are excluded as weekend days.
How It Works
Calculate Business Days in 3 Steps
Customize the calendar rules to match your business schedule.
Choose Dates
Enter a date range or choose a start date for adding business days.
Set Workweek Rules
Select weekend days and add custom holidays or closure dates.
Review Results
See business days, weekends, holidays and date calculations.
Calculator Features
Flexible Business Date Calculations
Date Range Counting
Count business days between any two valid calendar dates.
Custom Weekends
Choose non-working days that match your regional workweek.
Holiday Exclusions
Add custom holidays and company closure dates.
Add Business Days
Find a future date after a specified number of workdays.
Subtract Business Days
Calculate an earlier date while skipping non-working days.
Quick Presets
Quickly calculate common monthly and yearly date ranges.
Business Days Guide
What Is a Business Days Calculator?
A Business Days Calculator is an online date tool that counts working days between two dates while excluding selected weekend days and optional holidays. It can also calculate a future or previous date after adding or subtracting a specified number of business days.
Business day calculations are useful for project planning, delivery estimates, payment terms, administrative deadlines, staffing schedules and many other business activities.
How to Calculate Business Days Between Two Dates
Start with the selected date range. Each date is checked against the configured weekend schedule. Dates that fall on selected weekend days are excluded. Custom holiday dates are also excluded when they fall on an otherwise valid business day.
Basic Business Days Concept
Business Days = Included Calendar Dates − Weekend Dates − Applicable Holiday Dates
What Counts as a Business Day?
A business day generally refers to a regular working day. In many organizations this means Monday through Friday, excluding recognized holidays. However, business weeks differ by country, region, industry and organization.
For this reason, the calculator allows weekend days to be customized instead of assuming that every user follows the same schedule.
Calendar Days vs Business Days
Calendar days include every date in a period, including weekdays, weekends and holidays. Business days include only dates that meet the selected working-day rules.
This distinction can be important when calculating project timelines, invoice terms, processing periods and operational deadlines.
How Holiday Exclusions Work
Custom holiday dates can be added manually. If a holiday falls within the selected date range and would otherwise be considered a working day, it is excluded from the business-day total.
A holiday that already falls on a configured weekend day is not deducted twice. It is already excluded because of the weekend rule.
How to Add Business Days to a Date
Choose the Add or Subtract Business Days mode, select a start date and enter the required number of working days. The calculator moves forward or backward through the calendar while skipping configured weekends and custom holidays.
Business Days for Project Planning
Project timelines are often easier to understand when expressed in actual working days rather than calendar days. A ten-day task may span more than ten calendar days when weekends or holidays occur during the schedule.
Business Days for Invoice Due Dates
Some payment terms, administrative processes or contractual deadlines may refer to business days. The add-business-days mode can help estimate a date after a specified number of working days.
Always check the exact wording of contracts, regulations and payment agreements because the legal definition of a business day can vary.
Custom Workweeks and Regional Schedules
Not every organization uses Saturday and Sunday as its weekend. Some businesses operate six days per week, while others use different weekly non-working days.
The custom weekend selector makes the calculator more flexible for different workweek arrangements.
Common Uses for a Business Days Calculator
Project Timelines
Estimate working time between project milestones and deadlines.
Delivery Estimates
Calculate approximate schedules using working-day assumptions.
Payment Terms
Estimate dates for terms expressed in business or working days.
HR & Operations
Support scheduling and internal operational date calculations.
Inclusive vs Exclusive Date Counting
Date calculations can produce different results depending on whether the start date and end date are included. This calculator provides separate controls so you can choose the counting method that fits your use case.
Important Note
Results are general date calculations. Public holidays, banking days, government working days and legal definitions vary by country, region and organization. Verify official deadlines independently when the result affects legal, financial, tax, immigration or regulatory matters.
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Open Tool →FAQ
Business Days Calculator FAQs
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