Business Days Calculator
Calculate business days between two dates, or add business days to a date. Excludes weekends and US federal holidays automatically.
📅 Business Days Calculator — Working Days Between Dates: Calculate business days between two dates, or add business days to a date. Excludes weekends and US federal holidays automatically.
About business days calculator
Date calculator for Calculate business days between two dates, or add business days to a date. Excludes weekends and US federal holidays automatically.. Compute exact days, weeks, months, or years between two dates in any direction.
Benefits
- ·Computes day differences accurately
- ·Handles leap years and month-length variations
- ·Pairs with days-from / days-until calculators
- ·Useful for legal, financial, and project deadlines
How it works
Enter two dates and the calculator outputs the difference in days, weeks, months, and years. Internally it converts both to milliseconds, subtracts, and divides into appropriate units.
Calendar arithmetic gets complex quickly because months are not uniform. The calculator uses ISO 8601 conventions to keep results unambiguous across timezones.
Who uses business days calculator
Lawyers, project managers, HR specialists, and anyone needing precise day counts between two dates.
About this calculator
Calculate business days between two dates, or add business days to a date. Excludes weekends and US federal holidays automatically.
Related
Frequently asked questions
Which days are excluded from business-day counts?
All Saturdays, all Sundays, and the 11 US federal holidays: New Year's Day, MLK Day, Washington's Birthday (Presidents' Day), Memorial Day, Juneteenth, Independence Day, Labor Day, Columbus Day, Veterans Day, Thanksgiving, and Christmas. When a fixed-date holiday lands on a weekend, the federal observance shifts to the nearest weekday.
Can I customize which holidays to exclude?
The calculator uses US federal holidays by default. For company-specific holidays (Day after Thanksgiving, Christmas Eve) or non-US holidays, you would need to manually adjust. Many countries' bank-holiday lists differ — UK uses different holidays than US, Canada uses different than UK, etc.
How are partial business days handled?
The calculator works in whole days. A start date is counted as day 0 (already in progress) by default. If you need partial-day fractions for billing or SLA purposes, calculate hours separately.
Why use business-day rather than calendar-day arithmetic?
Many SLAs, court deadlines, banking transactions, and shipping commitments specify "5 business days" rather than "5 days." Banks especially: ACH transfers, check-clearing, and wire transactions all run on business-day timelines. Using calendar days for a business-day deadline can cause you to miss it by several days.