Project Deadline Calculator
Enter a project's start date and duration in days to calculate its deadline date and duration in weeks.
Project Deadline Calculator
Calculates a project's deadline date and duration in weeks from a start date and number of working days.
This calculator adds a duration in calendar days to a project's start date to determine its deadline, and also converts that same duration into weeks for easier planning conversations. It's a quick way to translate a stated project length ('30 days from kickoff') into a concrete calendar date without counting days by hand.
Example
- With the default values shown above, this calculator returns: Deadline Date = 2026-10-11; Duration in Weeks ≈ 4.3 weeks.
Frequently Asked Questions
Does duration count calendar days or business days?
This calculator uses calendar days (including weekends) — for a business-days-only duration, use a work-days estimator or adjust your entered duration accordingly.
Can I use this for a project already in progress?
Yes — set the start date to when the project actually began, or to today if you're planning a new deadline from the current date forward.
Sources
- Standard formula, publicly documented method