Working Days Between Dates Calculator
Working-day counts are useful for basic project schedules and elapsed business-day estimates. This calculator counts Monday through Friday and includes the start and end dates when they are weekdays.
How to use this calculator
- Enter both dates in YYYY-MM-DD format with the start date no later than the end date.
- Check that all inputs use the same units, period and population scope.
- Change one assumption at a time when comparing scenarios.
Formula used by working days between dates calculator
Count each calendar date in the inclusive range whose UTC weekday is Monday through Friday.
- Count each calendar date in the inclusive range whose UTC weekday is Monday through Friday.
- Public holidays, local workweeks, company shutdowns and country-specific calendars are not excluded.
- The tool validates inputs and rounds displayed figures for readability; it does not validate assumptions against external records.
Worked examples
Worked example
Monday 5 January through Friday 16 January 2026 includes ten weekdays.
Two Monday–Friday workweeks contain 10 weekdays.
The example range contains 10 working days and 12 calendar days.
Understanding the result
Working-day counts are useful for basic project schedules and elapsed business-day estimates. This calculator counts Monday through Friday and includes the start and end dates when they are weekdays.
Public holidays, local workweeks, company shutdowns and country-specific calendars are not excluded.
Important notes
Public holidays, local workweeks, company shutdowns and country-specific calendars are not excluded.
Treat the result as an estimate from the entered assumptions. For safety, legal, engineering, health or commercial decisions, verify relevant specifications and professional guidance.
Frequently asked questions
Are public holidays excluded?
No. The calculation excludes Saturdays and Sundays only.
Are both dates counted?
Yes, each endpoint is included if it is a weekday.
How should I interpret this result?
Public holidays, local workweeks, company shutdowns and country-specific calendars are not excluded.
Related calculators
- Business Days Calculator — Count weekdays between two dates, excluding Saturdays and Sundays.
- Date Difference Calculator — Find the exact number of days, months, and years between any two dates.
- Date Calculator — Add or subtract years, months, weeks, and days from any date.
- Hours & Minutes Calculator — Add or subtract hours and minutes for work, study, travel, and everyday time calculations.
- Days Payable Outstanding Calculator — Estimate days payable outstanding from average accounts payable and cost of goods sold for a chosen period.
- Days Sales Outstanding Calculator — Calculate days sales outstanding from average receivables and net credit sales over a matching period.
Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
- How to Calculate Days Between Dates — Learn how date intervals work, including leap years and inclusive vs exclusive day counting.
- Percentage Change vs Percentage Difference — Understand the difference between percentage change and percentage difference, including when each formula is appropriate.
- Standard Deviation — Understand standard deviation as a measure of spread and the difference between population and sample standard deviation.
This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.