How do you calculate business days between two dates?

Business days are calculated by iterating through every calendar day between the start and end dates and counting only Mondays, Tuesdays, Wednesdays, Thursdays, and Fridays while skipping Saturdays and Sundays.

How many business days are in a standard month?

A standard calendar month typically contains between 20 and 22 business days (working days), depending on month length and weekend distribution.

How many business days are in a full year?

In a standard 365-day year, there are usually 260 or 261 working days (52 weeks × 5 days = 260 days), minus applicable regional public holidays.

Time

Business Days Calculator

Calculate the exact count of working days between any two dates, automatically excluding weekend days.

Quick Answer & Summary

A business days calculator determines the number of official working days between two calendar dates by excluding weekend days (Saturday and Sunday). A standard 2-week period contains 10 business days, and an average month contains 20 to 22 business days.

Working Day Exclusion Logic

BusinessDays = ∑ Day ∈ [StartDate, EndDate] WHERE DayOfWeek(Day) ∉ { Saturday, Sunday }

Excludes 2 weekend days per 7-day cycle, computing 5 working days per standard week.

Start Date

End Date

Calculation Result

Working Days (Monday – Friday)

This calculator counts the total number of business days between the start date and end date, automatically excluding Saturdays and Sundays.

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Toolbox Editorial TeamVerified Authors

Systems & Security Engineers • Applied Cryptography & High-Performance Web Tools

Updated: August 2026

100% In-BrowserZero server storage

Standards AuditedRFC & ISO compliant

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Documentation & Guide

How to Use Business Days Calculator

Select Start Date

Choose the starting date of your project or sprint.

Select End Date

Choose the target completion or deadline date.

Instant Business Day Count

View the total working days automatically excluding weekend days (Saturday and Sunday).

Pro Tips

Use for project deadlines, contract turnaround time, and legal notice periods

Practical Examples & Conversions

Input

Monday to Sunday (2 weeks)

Output

10 Business Days

Frequently Asked Questions (PAA)

Related Tools & Converters

Business Hours Calculator

Calculate exact working hours between timestamps

Date Difference Calculator

Calculate total calendar days between dates

Calendar & Public Holidays

Check national public holidays

Week Number

Find the ISO week number

Authoritative Standards & Citations

Calculations and algorithms on this page are implemented and verified in strict accordance with the following official technical specifications:

International Organization for Standardization

ISO 8601: Date and Time Formats

Internationally accepted standard for representing dates and times.

Internet Assigned Numbers Authority

IANA Time Zone Database (TZDB)

Authoritative historical and current daylight saving time (DST) database.