Business Days Calculator
Count working days between two dates, or add business days to a date — with custom holiday exclusions.
22
business days
30
total days
8
weekend days
0
holidays
Business days exclude Saturdays and Sundays. Add your region's public holidays above for an accurate working-day count — useful for delivery estimates, project deadlines and SLA calculations.
About this tool
Weekends break the simple arithmetic of dates: a project due "in 10 working days" isn't 10 calendar days away, and a delivery promised in "5 business days" needs the weekends counted out. This calculator handles both of the questions that come up — how many working days lie between two dates, and what date falls a given number of working days from a start — with weekends excluded and your own holidays optionally removed too.
The "days between" mode counts the working days from one date to another and breaks down the total: business days, weekend days, and holidays, so you can see exactly where the calendar days went. The "add business days" mode answers the deadline question — enter a start date and a number of working days, and it returns the resulting date, skipping weekends (and holidays) as it counts. It even accepts negative numbers to count backwards, for "what date is 10 working days before this deadline?"
The holiday field is what makes it accurate for your situation: paste your region's or company's public holidays (one date per line) and they're removed from the count, since business days vary by country and even company. It's the same logic as a spreadsheet's NETWORKDAYS function, but instant and without building a formula — useful for delivery estimates, SLA and payment terms, project deadlines and leave planning.
How to use the Business Days Calculator
- 1Choose a mode: count working days between two dates, or add business days to a date.
- 2Enter your dates (or start date and number of days).
- 3Optionally paste holidays to exclude, one YYYY-MM-DD per line.
- 4Read the result — weekends (and your holidays) are automatically excluded.
Frequently asked questions
What counts as a business day?
Monday through Friday, excluding weekends — and excluding any public holidays you add. That's the standard definition used for delivery estimates, payment terms and SLAs. Since holidays differ by country and company, the calculator lets you supply your own for an accurate count.
How do I add my country's holidays?
Paste them into the holidays field, one date per line in YYYY-MM-DD format (for example 2026-01-26 for India's Republic Day). Each listed date that falls on a weekday is removed from the working-day count. Weekend holidays are already excluded as weekends.
Can it count backwards from a deadline?
Yes — in 'add business days' mode, enter a negative number to count working days backwards. This answers questions like 'if the deadline is the 30th, what's the date 10 working days before, when I need to start?' The result skips weekends and holidays in reverse.
Is this the same as NETWORKDAYS in Excel?
The logic matches Excel and Google Sheets' NETWORKDAYS function — working days between dates, weekends excluded, with an optional holiday list. This tool gives the answer instantly without writing a formula, and adds the reverse operation (finding a date N working days out) that NETWORKDAYS alone doesn't do.
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