Time & Date
Business Days Calculator
A business days calculator helps you count working days between two dates by excluding weekends and optional holiday dates.
Quick answer
By default, weekends are excluded from business day totals.
What this tells you
- •By default, weekends are excluded from business day totals.
- •Optional holiday dates can be excluded from weekday counts.
- •Start and end date inclusion can be toggled for schedule rules.
How to Use
- 1Select start date and end date.
- 2Choose whether to include the start date and end date in the count.
- 3Add optional holiday dates in YYYY-MM-DD format, one per line.
- 4Calculate to review total days, weekends, holidays, and business days.
How It Works
Formula
Business Days = Included Calendar Days - Weekend Days - Included Holidays (that fall on weekdays)The tool iterates each date in range, applies include/exclude rules for range boundaries, and subtracts weekend and weekday holiday counts.
Calculation note: values are processed in the order shown above, using the current input units.
Worked Examples
Project planning estimate
Start date2026-05-01
End date2026-05-15
Holidays2026-05-11
ResultEstimated business days after weekend and holiday exclusions
Useful for planning lead times, delivery windows, and internal deadlines.
Common mistakes
- Using local holiday names instead of ISO date values
- Forgetting to decide whether boundary dates should be included
- Assuming this tool includes regional holiday calendars automatically
Frequently Asked Questions
No. Add holiday dates manually to exclude them from weekday business day totals.
No. You can toggle inclusion for start date and end date based on your counting rule.
This tool uses Saturday and Sunday as weekend days.