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Deadline Calculator

Work backwards from a due date over business days to find the latest date you can start.

Work back from a deadline

Latest start date: —
Finish by: —
Calendar days available: — · Business days: —
Holidays inside the window: —
Notes: —
The due date counts as a working day when it is not a weekend or a holiday, so the last working day is included.

How to use the Deadline Calculator

  1. Enter the date the work is due to be finished.
  2. Type how many business days the work needs and pick which days are the weekend.
  3. Add any holidays, one per line, and read the latest start date.

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Frequently Asked Questions

Common questions about the free online deadline calculator.

Enter the due date and the number of business days the work needs, then the tool counts backwards to the latest day you can begin.
Yes. Saturdays and Sundays are skipped by default, and you can switch the weekend to Friday and Saturday or Sunday only.
Yes. When the due date is a working day it is treated as the last day of the project and the count runs backwards from there.
The tool moves back to the previous working day and reports it as the finish date, so the deadline is never missed by accident.
Every holiday you list is skipped just like a weekend, which moves the latest start date one working day earlier for each holiday.
Any amount from one to three hundred and sixty five, which covers a single task or a full year of scheduled work.
Weekends and holidays are not working days, so the calendar window from the latest start to the finish is always longer.
Yes. All of the counting happens in your browser and no dates, projects or holiday lists are uploaded anywhere.

Last updated: October 10, 2026