Business Days Calculator
Calculate working days between dates or find a future date by adding business days. Excludes weekends and lets you add custom holidays.
Excluded Holidays (optional)
How to use Business Days Calculator
The business days calculator counts working days between two dates or finds the date that falls a specified number of business days after a start date. It supports standard Mon–Fri and Mon–Sat work weeks, lets you exclude custom public holidays, and shows a breakdown of calendar days, weekend days, holiday exclusions and resulting business days.
- Choose mode: Count Between Dates or Add Business Days.
- Enter start and end dates (or start date and days to add).
- Select your work week configuration (Mon–Fri or Mon–Sat).
- Optionally add custom holidays to exclude.
- Click Calculate to see the business day count or target date.
Your data never leaves your device — 100% private processing.
What counts as a business day
A business day is any day that is not a weekend and not a public or custom holiday. In most countries this is Monday through Friday. Some cultures observe Friday–Saturday or Sunday–Thursday work weeks; use the custom configuration for those. The holiday list is entirely user-defined — enter national holidays or office-specific closure dates as needed.
Glossary
- Business day
- A weekday (non-weekend, non-holiday) on which business is conducted.
- Working day
- Synonym for business day in most contexts.
- Settlement date
- The date a financial transaction is finalised, typically T+2 business days.
Related reading
Frequently Asked Questions
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Why use Business Days Calculator?
- Handles timezone conversions and DST automatically
- Supports date arithmetic across years and leap years
- ISO 8601 and human-readable output formats
- Works for historical and future dates with full accuracy
Common use cases
- Calculate how many days until a project deadline
- Find the day of the week for a date in the past
- Convert meeting times across different time zones
- Calculate age from a date of birth
- Add or subtract business days for contract terms
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