Formula
Business days = count of dates in the selected range where weekday is Monday, Tuesday, Wednesday, Thursday or Friday. Start and end dates are included only when their toggles are set to 1.
Work & Payroll
Business Days Calculator
Count weekday business days between two dates, with optional start-date and end-date inclusion controls.
Calculator
Working calculator
Live result11 business daysMonday–Friday weekday count; public holidays not deducted
Formula used
Business days = count of dates in the selected range where weekday is Monday, Tuesday, Wednesday, Thursday or Friday. Start and end dates are included only when their toggles are set to 1.
This is the method behind the answer, so the result can be checked rather than simply trusted.Printable calculation report
Result: 11 business days. Assumption: Monday to Friday are treated as ordinary business days.
- Start year
- 2026
- Start month
- 5
- Start day
- 15
- End year
- 2026
- End month
- 5
- End day
- 29
- Include start date
- 1
- Include end date
- 1
- Page/date context
- 2026-05-16 UTC page version
- Page URL
- https://calculationtime.com/calculators/business-days-calculator
Worked example
15 May 2026 is a Friday and 29 May 2026 is also a Friday. Including both endpoints gives three Fridays, two Mondays, two Tuesdays, two Wednesdays and two Thursdays: 11 weekdays in total.
Professional note
For contracts, payment terms, freight cutoffs or legal notices, business-day wording can be jurisdiction-specific. Some countries or industries observe different weekends, and public holidays may or may not extend a deadline. Use this page for the base weekday count, then apply the governing calendar.
Regional and unit assumptions
The default uses a Monday-to-Friday workweek and numeric date inputs. That is useful for many office, payroll and project-planning checks, but it is not a substitute for a local holiday calendar.
Assumptions and limitations
- Monday to Friday are treated as ordinary business days.
- Saturday and Sunday are excluded.
- Public holidays, company shutdowns, regional weekends and industry-specific calendars are not deducted.
- Dates are evaluated at UTC midnight so daylight-saving hour changes do not affect date-only counting.
Methodology & Accuracy
How this calculator is checked
CalculationTime pages are built around visible arithmetic: the formula, assumptions, worked example and practical limitations are shown so the result can be checked rather than simply trusted.
Formula used
Business days = count of dates in the selected range where weekday is Monday, Tuesday, Wednesday, Thursday or Friday. Start and end dates are included only when their toggles are set to 1.
Standard or basis
The default uses a Monday-to-Friday workweek and numeric date inputs. That is useful for many office, payroll and project-planning checks, but it is not a substitute for a local holiday calendar.
Where a calculator follows a named legal, trade or industry standard, that standard is cited visibly. Otherwise the page uses transparent general arithmetic and states its limits.Master's Tip
For contracts, payment terms, freight cutoffs or legal notices, business-day wording can be jurisdiction-specific. Some countries or industries observe different weekends, and public holidays may or may not extend a deadline. Use this page for the base weekday count, then apply the governing calendar.
Related calculators
Questions
Does the business days calculator include the start date?
Yes by default. Set “Include start date” to 0 if the count should begin on the following date.
Does it subtract public holidays?
No. This version subtracts weekends only. Public holidays vary by country, region, employer and industry.
What counts as a business day here?
A business day is counted when the date falls on Monday, Tuesday, Wednesday, Thursday or Friday.
Can the answer be negative?
Yes. If the end date is before the start date, the calculator shows a negative count so reversed ranges are obvious.
Calculation note
Business-day counting is a practical layer on top of calendar-day counting. It answers a workplace question rather than a pure astronomy or date question: how many ordinary working dates are available between two calendar points?
Business days are convention, not physics
A calendar day is a date on the calendar. A business day is a social and legal convention about when ordinary work, banking, delivery or administration usually happens. That is why the same date span can have one elapsed-day count and a different business-day count.
Weekends are not universal in every context
This calculator uses the common Monday-to-Friday pattern because it is widely used for office planning and payroll arithmetic. It does not claim that every country, religion, industry or employer follows the same weekly rest days.
Why holiday calendars are separated
Public holidays can vary by nation, state, city, employment agreement and year. Keeping the base weekday count separate makes the arithmetic transparent before a local holiday calendar is applied.
Sources and further readingTimeanddate.com: Business days calculator notesNIST: Time and frequency from A to Z