Working Days Calculator - Business Days Between Dates | Calcoul
Free online working days calculator. Calculate business days between two dates, excluding weekends and holidays. Perfect for project planning and deadline management.
9 min readiAbout This Calculator
The working days calculator is your essential tool for calculating business days between any two dates. Whether you're planning project timelines, setting delivery deadlines, calculating payment terms (net 30, net 60), or determining how many workdays until your vacation, this calculator handles all your business day calculations. Unlike simple date calculators, our tool specifically excludes weekends (Saturday and Sunday) to give you an accurate count of working days. This is crucial for business planning, contract deadlines, HR calculations, and any scenario where only Monday through Friday counts. Understanding working days is essential for project managers, accountants, HR professionals, and anyone managing deadlines in a business context.
?How to Use
- 1
Enter your start date using the date picker. This is the first day of your calculation period.
- 2
Enter your end date. The calculator will count all working days between these two dates, inclusive.
- 3
Choose whether to exclude weekends from your calculation. Select 'Yes' for standard business days (Monday-Friday only) or 'No' to include all calendar days.
- 4
Click 'Calculate' to see your results with a detailed breakdown of total days, weekend days, and working days.
- 5
Review the breakdown to understand exactly how the working days are distributed between your selected dates.
fFormula
Working days are calculated by first counting all calendar days between the start and end dates (inclusive), then subtracting weekend days (Saturdays and Sundays) and any custom holidays you've specified. The calculation iterates through each day to accurately determine whether it falls on a weekday or weekend.
- Total Days
- The complete count of calendar days from start to end date
- Weekend Days
- Number of Saturdays and Sundays in the date range
- Holidays
- Optional custom holidays to exclude from working days
- Working Days
- The final count of business days (typically Monday-Friday)
Examples
Calculate Net 30 Payment Due Date
From January 5 to February 4, 2026, there are 31 calendar days but only 22 working days when excluding weekends. This is important for net 30 payment terms based on business days.
Project Sprint Planning
A two-week sprint from January 6-17, 2026 contains exactly 10 working days, perfect for planning a standard agile sprint.
Vacation Days Calculation
Taking leave from June 15-26, 2026 means 10 working days of PTO needed, as weekends don't count against your leave balance.
Quarterly Report Deadline
Q1 2026 contains 90 calendar days but only 64 working days. Essential for quarterly planning and resource allocation.
Use Cases
Project Management
Calculate actual working time available for projects. Plan sprints, set realistic milestones, and estimate delivery dates based on working days rather than calendar days.
Payroll & HR
Calculate PTO balances, sick leave, probation periods, and notice periods. HR departments rely on working day calculations for accurate leave management.
Finance & Accounting
Determine payment terms (net 30/60/90 business days), invoice due dates, and financial reporting deadlines. Critical for cash flow management.
Legal Deadlines
Many legal deadlines are specified in business days, not calendar days. Calculate appeal periods, response deadlines, and filing dates accurately.
Shipping & Logistics
Estimate delivery dates based on business day shipping. Many carriers only operate on weekdays, making working day calculations essential.
Frequently Asked Questions
What counts as a working day?
Does the calculator include both the start and end dates?
How do I account for public holidays?
What if my end date is before my start date?
How is this different from counting calendar days?
Can I use this for international business calculations?
How accurate is the working days calculation?
What about half-days or partial working days?
Conclusion
The working days calculator is an indispensable tool for anyone managing business deadlines, project timelines, or HR calculations. By accurately counting only Monday through Friday as working days, you can plan more effectively and set realistic expectations. Whether you're calculating payment terms, planning project sprints, or determining how much PTO you need for a vacation, this calculator provides the precision you need. Bookmark this page for quick access whenever you need to calculate business days between any two dates.