Construction Management Engineering

Free Float In | CPM | Primavera P6 | Project Management [PDF]

What is Free float In Project Management?

-It is an amount of time that a schedule activity can be delayed without delaying the early start of any following activities.

-Free Float = Earliest ES of Following Activities – ES of Present Activity – Duration of Present Activity

-Free float is measured by subtracting the early finish (EF) of activity from the early start (ES) of the successor activity.

-Free float represents the amount of time that a schedule activity can be delayed without delaying the early start date of any immediate successor activity within the network path.

-Free float is only calculated on the last activity in an activity sequence.

-Free float is the amount of time an activity can be delayed without delaying the early start of any immediate successor activity.

Free Float In PMBOK

Now let us look at a different type of Float – Free Float. According to PMBOK, free float is the amount of time that a schedule can be delayed without delaying the early start date of immediately following scheduling activities.

This is only calculated on the last activity on a path. So the node with Free Float is always the activity right before the finishing activity for Activity on Arrow type of Network Diagram or the finish for Activity on Node type of network diagram.


How to identify and calculate Free Float?

Free float is measured by subtracting the early finish (EF) of the activity from the early start (ES) of the following activity.

Tips For Free Float:

• Free float on the critical path is always zero.
• If anything else, it is likely to be a red herring question to trick you.

See Also

P6 Schedule Review Checklist

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