Understanding Business Days

In the world of project management, shipping, and legal contracts, "business days" are the standard unit of time. Unlike calendar days, business days strictly exclude weekends (usually Saturday and Sunday) and public holidays.

Why is it important?

Miscalculating a deadline by even one day can lead to breach of contract, missed shipping targets, or project delays. When a contract says "5 business days," it could mean anywhere from 5 to 10 calendar days depending on weekends and holidays.

The Formula

To calculate business days manually:

1. Start with your begin date.
2. Count forward by 1 day.
3. If the new day is a Saturday or Sunday, skip it.
4. If the new day is a public holiday (like New Year's or Christmas), skip it.
5. Repeat until you have counted the required number of business days.

Or, simply use our free Business Day Calculator to get an instant, accurate result with a visual timeline.

Common Public Holidays in the US

• New Year's Day (Jan 1)
• Memorial Day (Last Monday in May)
• Independence Day (July 4)
• Labor Day (First Monday in September)
• Thanksgiving (Fourth Thursday in November)
• Christmas Day (Dec 25)

Tips for Accurate Planning

Always verify the specific holiday calendar for your region. Some businesses observe holidays that others do not (e.g., Columbus Day vs. Indigenous Peoples' Day). using an automated tool removes the human error factor.