Business Days Calculator
Calculate a future or past date by adding or subtracting a number of business days (Mon–Fri).
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How to use this calculator
- 1
Enter the start date.
- 2
Enter the number of business days to count.
- 3
Choose forward (future date) or backward (past date).
- 4
The result date and day of the week appear instantly.
Frequently asked questions
What counts as a business day?
This calculator counts Monday through Friday as business days, skipping Saturday and Sunday. It does not exclude public holidays.
If I start on a Friday, does that count as day 1?
Yes — if the start date is a weekday, it counts as day 0 (the starting point). Day 1 is the next business day.
Can I calculate backwards from a deadline?
Yes — select "Backward (subtract)" and enter your deadline as the start date to find when you need to begin.
Adding business days to a date
How to use the business days
This business days gives you instant, accurate results — no registration or download required. Enter your values above and get your result in seconds. The tool is free, works on all devices, and keeps your data private — nothing is stored or shared.
How the business days works
The business days uses standard formulas used in financial planning, budgeting, and investment decisions. Enter your inputs, and the tool calculates the result instantly in your browser. No server-side processing means your data stays on your device. Results update in real time as you change inputs.
Business days in contracts and SLAs
Business day calculations appear in payment terms ("Net 30 business days"), shipping estimates ("3–5 business days"), legal response deadlines, and employee notice periods. Skipping weekends is crucial — a deadline 10 calendar days away may be only 7 or 8 business days depending on where it falls in the week.
Weekend handling
When counting forward, if the result lands on a Saturday it is moved to Monday; Sunday moves to Monday. When counting backward, Saturday moves to Friday and Sunday moves to Friday. This ensures the result is always a weekday.
Business days: how it works
Date and time calculations underpin project planning, legal deadlines, contract management, and everyday scheduling. This tool handles the arithmetic automatically, accounting for leap years, time zones, and calendar edge cases.
Who uses this tool?
Project managers, solicitors, HR teams, and individuals use it to count days, plan around weekends, and verify contract dates — any situation where getting the timing right matters.
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Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →