Business Days Calculator
Calculate Business Days values quickly with a free online utility tool.
This business days calculator counts the number of weekdays (Monday through Friday) between two dates, excluding weekends and optionally excluding specified holidays - useful for estimating shipping times, project deadlines, or contractual deadlines specified in business days.
Enter a start date and end date, and the calculator returns the number of business days between them.
Worked Calculation Examples
| Scenario | Result | Calculation Step |
|---|---|---|
| Monday, June 2 to Friday, June 13 (no holidays) | 10 business days | 12 calendar days span this range, minus 2 weekend days (June 7-8), leaving 10 business days. |
| 10 business days from Wednesday, March 5, with 1 holiday | Lands on Wednesday, March 19 | Counting forward 10 weekdays from March 5 while skipping both weekends and the March 10 holiday lands on March 19. |
Why Business Days Differ from Calendar Days
A calendar day count includes every day, while a business day count excludes Saturdays and Sundays - a 10 business day period typically spans about 14 calendar days once two weekends are factored in, which is why deadlines quoted in business days often take longer in real time than the number might initially suggest.
Adding Holidays to the Count
Many business day calculations also need to exclude recognized holidays, since offices, banks, and shipping carriers typically don't operate on those days either - a thorough business day calculation should account for both weekends and any relevant holidays that fall within the date range being counted.
How to Use the Business Days Calculator
- Open the Business Days Calculator and enter the values requested in the input fields.
- Check the units, percentages, dates, or time periods before reading the answer.
- Review the instant result and adjust any value to compare another scenario.
- Use the formula, example, and FAQs below to understand how the business days calculator works.
Frequently Asked Questions
How do you calculate business days between two dates?
Count all weekdays (Monday through Friday) between the two dates, excluding Saturdays and Sundays, and optionally excluding any recognized holidays within that range.
How many calendar days is 10 business days?
It's typically around 14 calendar days, since a 10 business day span usually crosses two weekends, though the exact count depends on which day of the week the period starts.
Do business day calculations account for holidays?
A complete business day calculation should exclude relevant holidays in addition to weekends, since most businesses, banks, and shipping services don't operate on those days either.
How do I use this business days calculator?
Enter the known values, review the units or settings, and the calculator updates the result instantly. The formula and example on this page show how the answer is produced.
What does the Business Days Calculator calculate?
Calculate Business Days values quickly with a free online utility tool. It is designed for fast browser-based calculations without sign-up, downloads, or manual spreadsheet setup.
What formula does this business days use?
The formula is: Business Days = Total Days − Weekends − Holidays. The five-day, Monday-through-Friday standard workweek became widespread in the US following Henry Ford's 1926 decision to adopt a 40-hour, five-day week at his automobile plants - a policy other major employers gradually followed over subsequent decades, eventually cementing 'business days' as excluding Saturday and Sunday in commercial and legal contexts.
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Last updated: September 27, 2026.