Does this tool skip public holidays?

No. The calculator skips only Saturdays and Sundays. Public holidays vary by country and organisation, so you should add those days to your working-day count manually.

Is the start date counted as a working day?

Yes, if the start date falls on a weekday it counts as day 1. If you enter a Saturday or Sunday as the start date, the calculator automatically moves to the next Monday.

What is the maximum number of working days I can enter?

Up to 3,000 working days (roughly 12 years). For most projects, a value between 5 and 500 is typical.

How is the calendar day count calculated?

Calendar days is simply the difference between the start date and the deadline date in days, including weekends.

What are the milestones for?

They mark 25%, 50%, and 75% of the working-day duration so you can plan check-ins or reviews at even intervals across the project.

Can I use this for legal business-day deadlines?

You can use it as a starting point, but statutory "business days" in some jurisdictions exclude public holidays. Always verify with a legal professional for compliance purposes.

Project Deadline Calculator

Name: Project Deadline Calculator
Availability: InStock
Author: Nham Vu

Enter a start date and number of working days to instantly find your project deadline, skipping weekends.

Project Details

Start Date

Duration (working days)

Mon–Fri only. Enter 1 to 3,000.

Enter a start date and duration, then click Calculate Deadline.

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Summary

Enter a start date and number of working days to instantly find your project deadline, skipping weekends.

How it works

Enter the project start date.
Enter the total number of working days for the project.
The calculator counts forward through Mon–Fri only, skipping Sat and Sun.
The resulting date is your deadline.
Milestones at 25%, 50%, and 75% of working days are also calculated.
Click Copy to share the result summary.

Use cases

Plan a software sprint and find its exact end date.
Set a client delivery date based on working-day estimates.
Calculate a legal or compliance deadline that runs on business days.
Verify a vendor quote that specifies delivery in "X business days."
Schedule milestone reviews at quarter-way points of a project.
Estimate how many calendar days a project will actually take.
Coordinate team handoffs by knowing exact checkpoint dates.
Double-check automated date fields in project management tools.

Frequently Asked Questions

Last updated: 2026-06-09 · Reviewed by Nham Vu