Business Days Calculator

What is a business day?

A business day (also called a working day) is a day when most businesses are open and operational. In most countries, that means Monday through Friday, excluding weekends and public holidays. But it's not the same everywhere — Gulf countries often observe a Friday–Saturday weekend, and some regions use a six-day workweek.

Business days matter because contracts, SLAs, payment terms, shipping estimates, and legal deadlines are almost always measured in working days rather than calendar days. A "30-day notice period" that runs on business days is actually six calendar weeks, not four — and misreading that distinction can turn a routine deadline into a missed one.

This calculator helps you get the count right, every time. It handles custom weekends, custom holiday lists, both inclusive and exclusive counting, and both directions — counting days between dates, or adding and subtracting working days from a start date.

How to use the business days calculator

1. Choose a mode: Use "Count Between Dates" to find how many working days fall between two dates, or "Add / Subtract Days" to find a date that's N business days away from a starting point.
2. Enter your dates: Pick a start date and an end date (or a start date and a number of business days).
3. Set your weekend days: The default is Saturday and Sunday. Click the chips to customize — for example, select Friday and Saturday for Gulf countries.
4. Add holidays (optional): Paste any public holidays or company closures, one date per line. They'll be subtracted from the count automatically.
5. Click Calculate: You'll see the business days count, plus a full breakdown of calendar days, weekend days, holidays, and estimated work hours.

Why use this calculator?

Business days vs calendar days: the key difference

Most deadline confusion comes from one simple mistake: treating "days" and "business days" as the same thing. They're not.

Calendar days are every day on the calendar, including weekends and holidays. Business days are only the days when work actually happens — typically Monday through Friday, minus any public holidays.

The difference is dramatic. A "5-day delivery estimate" placed on a Friday can mean Wednesday if it's calendar days, or the following Friday if it's business days. For contracts, that distinction has real consequences.

Who uses a business days calculator?

Project managers and team leads

• Estimate realistic task durations by counting only working days
• Set milestones that account for weekends and holidays
• Track progress against a business-day schedule

HR and payroll professionals

• Calculate notice periods and probation durations in working days
• Track leave balances and benefit waiting periods
• Plan payroll cycles around business days

Legal and compliance teams

• Work out statutory deadlines and response windows
• Verify contract notice periods measured in business days
• Check filing deadlines for courts and regulators

Shipping and logistics

• Convert "3–5 business days" delivery estimates to calendar dates
• Plan dispatch and delivery around weekends and holidays
• Provide accurate SLA response-time estimates

Finance and banking

• Calculate settlement periods (T+2, T+3) in business days
• Track ACH and SWIFT transfer clearance times
• Determine payment due dates for Net 30, Net 60 terms

Different workweeks around the world

Not every country treats Saturday and Sunday as the weekend. This calculator lets you customize your non-working days to match your local practice:

By selecting the right weekend days, your count will match the actual working schedule for your location or your client's location.

Frequently asked questions