What is the difference between Total Float and Free Float in Primavera P6

In Primavera P6 we have 2 important value: Total Float and Free Float.

So what is the difference?

Total Float: is the amount of time an activity can be delayed without delaying the Project Finish Date.

Free Float: is the amount of time an activity can be delayed without delaying its Successor Activity Finish Date.

Let’s look at this example:

What is the difference between Total Float and Free Float in Primavera P6-2

The Total Float value of Activity A, B, C, D, E, I is 0 day. Meaning that if they’re delayed, the Project Finish Date will be delayed.

The Total Float value of Activity F, G, H is 5 days. Meaning that they can be delayed 5 days without making the Project Finish Date delay.

The Free Float value of Activity A is 0 day. Meaning that if it was delayed, the Successor Activity Finish Date (Activity B, F) will be delayed.

The Free Float value of Activity H is 5 days. Meaning that it can be delayed 5 days without making the Successor Activity Finish Date (Activity I) delay.

If Total Float value of an activity is 0, definitely the Free Float value of it is 0.

Meaning that the activity is critical to Project Finish Date and to its successor.

If Free Float value of an activity is 0, it’s not sure that the Total Float value of it is 0.

Meaning that the activity is critical to its successor, but it may not be critical to Project Finish Date.

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