Overview
Estimate a project delivery date based on working days rather than calendar days. The tool excludes the weekly weekend and any official holidays you enter, and shows the span in weeks.
Formula
Add working days one by one from the start date, skipping any weekly weekend or listed holiday. The last added day is the finish date.
How it works
Set the start
The project start date.
Enter working days
The required number of working days.
Add holidays
Choose the weekend and official holidays.
Worked examples
A 20-working-day project
Starting November 1, 2026 with a Friday–Saturday weekend, it finishes in about four weeks.
An official holiday
Add December 2 as a holiday to push the finish date by one day.
Frequently asked questions
Are Fridays and Saturdays counted?
No, when they are part of the selected weekend.
Can the start date be counted?
Yes, if it is a working day. If it is a weekend or holiday, counting begins on the next working day.
Are official holidays automatic?
No, enter their dates manually to deduct them.
This calculator is for educational and informational purposes only and is not a substitute for professional advice.