Business Days Calculator
Calculate business days between dates, add business days to a date, and manage custom holiday lists. All calculations happen locally — nothing leaves your browser.
How to Use the Business Days Calculator
- Add business days — enter a start date and number of business days to find the result date.
- Count between dates — find how many business days exist between two dates.
- Manage holidays — add custom holidays to exclude from business day calculations.
- Export holidays — save your holiday list as JSON for reuse.
Why Business Days Matter
Business days are crucial for project planning, contract deadlines, and delivery estimates. Understanding how weekends and holidays affect timelines helps you set realistic expectations and avoid missed deadlines.
Frequently Asked Questions
Business days are typically Monday through Friday, excluding public holidays. This calculator excludes weekends by default and lets you add custom holidays for your region.
Click "Load US Holidays" to add common US holidays, or use the Export/Import feature to load a holiday list from a JSON file. You can add holidays one at a time using the date and name fields.
Yes, enter a negative number of business days to find a past date. For example, entering -10 will find the date 10 business days before the start date.
Use Cases
Project Deadline Planning
Calculate realistic project deadlines by accounting for business days, weekends, and holidays in your timeline estimates.
Contract Term Calculation
Determine exact contract durations in business days for legal agreements, SLA terms, and service-level calculations.
Payroll Cycle Planning
Plan payroll cycles and payment schedules by calculating business days between pay periods and processing deadlines.
SLA Compliance Tracking
Track service level agreement compliance by calculating response and resolution times in business days.
Academic Scheduling
Plan academic semester schedules, exam periods, and assignment deadlines using business day calculations.