← Planning & Project Management
• Planning & Project Management · Tool

Project Duration Calculator

Calculate project duration using calendar days or configurable working days.

Enter your figures

Enter the values below to calculate your result.
Use ISO dates, separated by commas.

Calculation Results

Based on the figures you entered.
Calendar duration
0 days
Working days0
Calendar weeks0.00
Working-day results exclude the selected non-working weekdays and listed holidays.

How to use this calculator

What to enter

Enter the values requested in each field: Project start date; Project finish date; 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.