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Business Days Calculator

Use this business days calculator to count Monday-through-Friday workdays between two dates and subtract known holidays or PTO days.

Loading calculator with your local date and time…

Which date tool should I use?Choose the operation that matches the date question.
Days between datesUse when you need the elapsed days or weeks between two calendar dates.Add or subtract timeUse when you need a new date after adding or subtracting a duration.Business days (this tool)Use when weekends and workday counting change the answer you need.

Formula

Business days formula

Business days = weekdays between dates - entered holiday/PTO weekdays

Weekdays are Monday through Friday. The calculator does not know exact holiday calendars unless you enter those days as a manual adjustment.

How to use

Steps

  1. Enter the start date and end date.
  2. Choose whether to include the end date in the count.
  3. Enter any holidays, office closures, or PTO weekdays to subtract.
  4. Use the adjusted business days result for planning timelines.

Example

Sample calculation

Date rangeMay 26 to Jun 26
Weekdays24
Holiday/PTO adjustment1 day
Adjusted business days23

Calculator use

Best for

  • Checking calendar, work-hour, school, deadline, age, or duration math before copying the result elsewhere.
  • Comparing inclusive versus exclusive dates, breaks, grading weights, or time spans with the assumptions visible.

Before relying on it

Check first

  • Mixing inclusive and exclusive date counting, time zones, overnight shifts, unpaid breaks, holidays, or school-specific grading rules.
  • Rounding time or grades too early and then using the rounded result in another calculation.
  • Treating a planning result as payroll, HR, transcript, legal deadline, or official school policy.

Details

What to know before using the result

Weekday countMonday to Friday

Saturday and Sunday are skipped automatically.

Holiday handlingManual adjustment

Enter only holidays or PTO days that fall on weekdays inside the selected range.

Deadline limitsCheck official calendars

For contracts, courts, payroll, shipping, or government deadlines, verify the exact calendar and rules.

Benchmarks

How to read the result

5 business days: About 1 workweek.

Useful for short delivery windows, review cycles, and support timelines.

10 business days: About 2 workweeks.

Often used for approvals, onboarding, billing, and admin tasks.

20 - 23 business days: About 1 work month.

A rough planning range for many month-long work periods.

Calculator accuracy

Methodology and assumptions

Formula, inputs, limitations and review record
Formula

Business days = weekdays between dates - entered holiday/PTO weekdays

Inputs used

Start date, End date, End date setting, Holiday/PTO days

Limitations

Everyday results are quick planning checks. Unit choices, rounding, labels, measurements, local prices, and real-world constraints can change the final decision.

Review record

Catalog QA baseline on June 6, 2026. This date marks the catalog-wide automated and editorial QA baseline, not a tool-specific expert review.

Cite this page

Toolkit Shelf. Business Days Calculator. https://toolkitshelf.com/tools/business-days-calculator

FAQ

Common questions

What counts as a business day?

This calculator treats Monday through Friday as business days and skips Saturday and Sunday.

Does it know public holidays?

No. Enter holidays, PTO, or office closures as weekday adjustments when they apply.

Should I use this for legal deadlines?

Use it only as a planning check. Legal, court, shipping, payroll, and government deadlines can have specific calendar rules.