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• Planning & Project Management · Tool

Milestone Date Calculator

Calculate milestone dates from cumulative working-day durations.

Enter your figures

Enter the values below to calculate your result.
Format: Milestone name:working days. Example: Design:10, Build:20
Use ISO dates, separated by commas.

Calculation Results

Based on the figures you entered.
Milestones are calculated sequentially from the project start date.

How to use this calculator

What to enter

Enter the values requested in each field: Project start date; Milestones; Working days; Mon; Tue; Wed; Thu; Fri; Sat; Sun; Holidays (optional). Keep time units, work calendars, and currency amounts consistent, and follow any field notes and validation messages.

What the result means

The schedule result estimates a project or task date, duration, working-day count, milestone, or schedule flexibility from the task and calendar values entered. Check the start/end-date convention, workweek, holidays, dependencies, and whether the end date is inclusive.

When to use it

Use this to plan a project schedule or check a target date. Update dependencies and calendars when plans change; actual delivery can be affected by resource constraints, delays, and work that is not represented in the inputs.