Business Days Calculator

What is a Business Days Calculator?

Calculate net working business days between two dates, or add/subtract X business days from a starting date while automatically skipping weekends (Saturday & Sunday) and custom public holidays.

Why Use This Tool?

Project & Invoice Deadlines: Calculate exact business days remaining for project deliverables or 30-day invoice payment terms.
Legal & HR Deadlines: Compute 10-business-day notice periods or contract review windows.
Supply Chain Delivery: Estimate shipping arrival dates based on business day transit estimates.

How to Use

Select Start Date and End Date (or enter business days to add/subtract).
Toggle weekend exclusions (Sat/Sun) and add custom holiday dates.
View total calendar days, total weekends, and net working business days.

Real Working Example

Input:

Start: Monday, March 2, 2026 | Add: 10 Business Days

Output Result:

Result Date: Friday, March 13, 2026 | Total Days: 12 | Business Days: 10 | Weekends Skipped: 2 Days

Important Technical Details & Formulas

Weekend & Holiday Date Math Engine: Iterates calendar dates skipping Saturday (6) and Sunday (0) plus custom holiday date arrays.
Bi-Directional Calculation: Supports counting business days between dates OR adding/subtracting business days from a start date.
Client-Side Engine: Fast local calculation in browser memory.

Related Measurement & Time Tools

Work Hours Calculator: Calculate shift work hours.
Probation Calculator: Calculate probation milestone dates.
Countdown Timer: Count down to target dates.

Frequently Asked Questions

Does the calculator exclude weekends automatically?

Yes, Saturdays and Sundays are excluded from working business day totals by default.

Can I add custom public holidays?

Yes, add custom holiday dates to exclude them from business day counts.

Is it free?

Yes, 100% free.

Can I subtract business days backwards from a date?

Yes, add or subtract business days forward or backward.

What is the main function of Business Days Calculator?

Count working business days between dates, add or subtract business days, and exclude weekends and public holidays. This calculator computes business days values and parameters accurately in your browser.