P6 Schedule Calculator
What is a P6 Schedule Calculator?
What is P6 Schedule?
The P6 Schedule Calculator models the calendar progression of a single activity or sequence, mapping working duration onto calendar days after adjusting for weekly rest days.
Formula
Calendar Finish Date = Start Date + Working Days Duration + (Non-Working Weekend & Holiday Days)
Variables Explanation
- Start Date: Scheduled activity start day.
- Duration: Required net working days.
- Work Week: 5-day, 6-day, or 7-day working calendar.
How to Calculate
1. Select planned start date.
2. Input calculated working days duration.
3. Choose active calendar work-week format (e.g. 6-day site week).
4. View target calendar finish date.
Worked Example
Planned Start: Monday, Oct 2.
Duration: 15 Working Days on a 6-day work week (Sundays Off).
Week 1: 6 working days (Mon-Sat). Sunday Off.
Week 2: 6 working days (Mon-Sat). Sunday Off.
Week 3: 3 working days (Mon-Wed).
Finish Date: Wednesday, Oct 18.
Practical Construction & Project Controls Use
Essential for contractual baseline date setting, issuing subcontractor milestone notices, and validating Primavera P6 lookahead schedules.
Understanding the Result
Displays the exact calendar date when an activity will finish, highlighting the difference between elapsed calendar days and actual working days.
Limitations & Assumptions
Models single calendar rules. Complex multi-calendar dependencies (e.g., curing vs pouring calendars) require full P6 network scheduling.
Frequently Asked Questions
What is the difference between working days and calendar days in P6?
Working days represent actual days labor is performed, while calendar days include weekends, holidays, and weather downtime.
How do project holidays impact the P6 finish date?
Holidays act as non-working periods in the P6 calendar, shifting the finish date forward without increasing labor hours.
What is a 6-day construction calendar?
A 6-day calendar includes Monday through Saturday as active work days with Sunday designated as non-working.
Why does P6 schedule an activity past a deadline if duration seems short?
If non-working calendar days fall within the period, total elapsed time will exceed duration in days.
Can I calculate end dates for 24-hour continuous concrete pours?
Yes, continuous operations use a 7-day 24-hour calendar where calendar days equal working days.