Business Day Calculator
Calculate business days between two dates. Excludes weekends and holidays with custom holiday support. Also features a business day addition mode.
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How to Use
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- 1
Select Calculation Mode
Use "Count Business Days" to calculate business days between two dates, or "Add Business Days" to find the date after adding N business days to a start date.
- 2
Enter Dates
Enter the start date and end date (or number of business days). Tap the field to select from a calendar.
- 3
Adjust Exclusion Settings
Weekend exclusion is on by default. You can also add custom holidays to exclude from the calculation.
- 4
View Results
Business days, calendar days, and excluded days are displayed in real-time.
Count Business Days
Tap to select from calendar
Tap to select from calendar
Settings
No custom holidays added
What is Business Day Calculator?
Business Day Calculator is an online tool that accurately calculates the number of working days excluding weekends and holidays. It's essential for project deadline estimation, contract period management, and business scheduling. Custom holiday support lets you adapt the calculation to your specific needs.
Key Features
- Real-time calculation of business days between two dates
- Add N business days to a start date to find the end date
- Toggle weekend exclusion on or off
- Custom holiday addition and removal
- Detailed breakdown of excluded weekends and holidays
Use Cases
- Calculating when a package will arrive if shipping takes 3–5 business days
- Determining the due date for a contract that specifies a 10-business-day response window
- Counting working days between project kickoff and deadline for effort estimation
- Planning how many days of PTO to request for a vacation spanning a holiday week
- Confirming payment processing timelines for ACH transfers or bank transfers
- Counting the total billable working days in a month for freelance or contractor invoicing
FAQ
What counts as a business day?
A business day typically refers to any day that is not a weekend (Saturday or Sunday) or a public holiday. This tool excludes weekends by default and allows you to add custom holidays for company-specific closures.
Is the start date included when adding business days?
No, the start date is not counted. For example, adding 1 business day to Monday gives you Tuesday. This matches the common business convention for deadlines like "within 5 business days."
Can I use this without excluding weekends?
Yes, you can uncheck the "Exclude weekends" option to count all calendar days except holidays. This is useful when you need to count days in a custom work schedule.
Is my data saved?
No. Calculations run as JavaScript in your browser. Input data is not transmitted or stored on any server.