Calculating Free Float and Total Float
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How to Determine Free Float
Calculations for float time use ES, EF, LS , and LF values.
The calculation for free float, which again is the amount of time an activity can be delayed without affecting the early start date of the successor activity, is:
Free Float = ES (successor task) - EF (predecessor task)
In the following example, the calculation for free float between activity A and activity B is FF = 5 - 3 = 2. This means that task A can finish as late as day 5 without affecting task B.