What counts as a business day?

This calculator treats Monday through Friday as business days. Saturdays and Sundays are excluded. Public holidays are not excluded.

Does the starting day count when I add business days?

No. Adding N business days starts counting from the next weekday after the start date. For example, Friday plus 1 business day is Monday.

Are public holidays excluded?

No. This tool uses a simple Monday–Friday definition and does not remove country-specific public holidays. If your contract excludes holidays, adjust the result manually.

What is the difference between business days and calendar days?

Calendar days include every day on the calendar. Business days skip weekends. Net payment terms on invoices usually use calendar days unless the agreement says business days.

How does counting business days between two dates work?

The count includes both the start and end dates when they fall on weekdays, similar to Excel NETWORKDAYS without a holiday list. If the end date is before the start date, the range is ordered automatically.

Business Days Calculator

Add or subtract working days from a date, or count business days between two dates. Saturdays and Sundays are excluded; public holidays are not.

Calculation

Start date

Number of business days

Direction

Weekends (Saturday and Sunday) are excluded. Public holidays are not excluded.

Result date

—

Calendar days spanned: —
Weekend days: —
Business days: —

Public holidays are not excluded from these results.

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Need a due date in calendar days? Invoice Due Date Calculator or browse all calculators.

Useful examples

Click an example to load it into the calculator.

What are business days?

Business days (also called working days) are the weekdays when most offices operate—typically Monday through Friday. Weekends are excluded. Some contracts also exclude public holidays; this calculator does not, so it stays simple and consistent worldwide.

How business days are calculated

Add / subtract: move forward or backward one calendar day at a time, counting only Monday–Friday, until the requested number of business days is reached. The start date itself is not counted as day 1.
Count: count every Monday–Friday from the start date through the end date, inclusive (similar to Excel NETWORKDAYS without a holiday calendar).
Calendar days still include weekends; use them when you need the full span between two dates.

Business days and invoice payment terms

Standard Net terms (such as Net 30) usually mean calendar days, including weekends. If your agreement says payment is due in a number of business days, use this calculator instead of adding calendar days. For typical Net due dates, use the Invoice Due Date Calculator.

Frequently asked questions

What counts as a business day?: This calculator treats Monday through Friday as business days. Saturdays and Sundays are excluded. Public holidays are not excluded.
Does the starting day count when I add business days?: No. Adding N business days starts counting from the next weekday after the start date. For example, Friday plus 1 business day is Monday.
Are public holidays excluded?: No. This tool uses a simple Monday–Friday definition and does not remove country-specific public holidays. If your contract excludes holidays, adjust the result manually.
What is the difference between business days and calendar days?: Calendar days include every day on the calendar. Business days skip weekends. Net payment terms on invoices usually use calendar days unless the agreement says business days.
How does counting business days between two dates work?: The count includes both the start and end dates when they fall on weekdays, similar to Excel NETWORKDAYS without a holiday list. If the end date is before the start date, the range is ordered automatically.

Set invoice due dates with the Invoice Due Date Calculator. If a payment is late, try the Late Payment Fee Calculator. Late payment interest tools are listed on All Calculators. Ready to bill? Create an invoice.