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Business Days Calculator

Calculate working days between dates, add or subtract business days, and plan around weekends and holidays with multi-region support.

Configuration

Start Date
End Date
Advanced Settings Region, Weekend Days, & Options
hrs/day — shown in formula strip
RESULT
US
Business Days
-- Days
-- Total Days
–
-- Weekends
–
-- Holidays
=
-- Business Days
Calendar Days --
Weekends --
Holidays --
Working Day % --
Work Hours --
Enter dates to check calculation
Business Day
Holiday
Weekend
Start Date
Target Date
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Enter dates to see the timeline
Holidays and key dates will appear here once you calculate a range.
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How to Use This Calculator

1

Enter Start Date

Select or type the starting date for your calculation.

2

Enter End Date or Days

Choose an end date to count business days between them, or enter a number of business days to add/subtract.

3

Review Results

See the total business days, calendar days, weekends excluded, and any holidays in the range.

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Formula & Methodology

Business Days Between
Business Days = Calendar Days − Weekends − Holidays
Excludes Saturdays, Sundays, and specified public holidays.
End Date from Business Days
End Date = Start + Business Days + Weekends + Holidays
Iteratively adds calendar days, skipping non-business days.
Work Hours
Work Hours = Business Days × Hours per Day
Default 8 hours/day, adjustable for part-time or extended schedules.

About this calculation · Accuracy & Methodology

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Key Terms Explained

Business Day A standard working day, typically Monday through Friday, excluding public holidays.
Calendar Day Any day of the week including weekends and holidays.
Federal Holiday One of 11 U.S. federal holidays when government offices and many businesses close.
Lead Time The number of business days required to complete a task or deliver a product.
SLA Window Service Level Agreement timeframe, often measured in business days rather than calendar days.
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Real-World Examples

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Project Timeline

Start: March 10, End: April 18 (2025)

Result
28 business days, 40 calendar days, 10 weekend days, 0 holidays.
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Working with Business Days

Why Business Days Matter

Contracts, SLAs, legal deadlines, and shipping estimates all rely on business days. Misunderstanding business days vs. calendar days is one of the most common causes of missed deadlines. A '10-day delivery window' in business days is actually 14 calendar days — and can stretch to 16+ days around holiday weekends.

International Considerations

Business days vary by country. Many European countries observe more public holidays (10-15 per year) than the U.S. (11 federal). Some Middle Eastern countries use Sunday-Thursday as the work week. When working with international teams or clients, always specify the calendar standard being used.

Business Days per Month (2025, U.S.)

MonthCalendar DaysBusiness DaysFederal Holidays
January31212 (New Year's, MLK Day)
February28191 (Presidents' Day)
July31211 (Independence Day)
November30192 (Veterans Day, Thanksgiving)
December31221 (Christmas Day)
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Frequently Asked Questions

What counts as a business day?+

A business day is any day that is not a weekend (Saturday or Sunday) and not a recognized public holiday. The calculator excludes both weekends and holidays from the count automatically. You can select from US, UK, Canada, Australia, and Germany holiday calendars to match your region.

Does the calculator include or exclude the start and end dates?+

When counting business days between two dates, the calculator excludes the start date and includes the end date by default, which matches the standard convention used in legal and financial contexts. When adding business days to a start date, the start date itself is not counted as day one.

Can I add custom holidays or non-working days?+

The calculator includes standard national holidays for supported countries. For company-specific closures, floating holidays, or industry shutdowns, you can manually adjust the result by subtracting those additional non-working days from the total. The holiday list covers the most widely observed public holidays for each region.

Why would I need to calculate business days?+

Business day calculations are essential for contract deadlines, payment terms (Net 30 often means 30 business days), shipping estimates, project scheduling, legal filing deadlines, SLA compliance tracking, and financial settlement periods. Using calendar days instead of business days for these purposes can lead to missed deadlines.

How accurate is the holiday data across different countries?+

The calculator includes all major federal and national holidays for each supported country through 2027. It covers fixed holidays like Christmas and Independence Day as well as floating holidays like Easter and Thanksgiving. Regional or state-level holidays are not included, so you may need to adjust for those manually.