Total Float vs. Free Float
What is the Total Float and the Free Float for Activity F and J?
0 A 2 2 B 5 5 C 9 9 D 17
0 2 2 2 3 5 5 4 9 9 8 17
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Start
0 E 2 2 F 5 5 G 9 9 H 14
End
3 2 5 5 3 8 8 4 12 12 5 17
Convention Used:
0 I 2 2 J 3 ES N EF
2 1 AD
5 7 7 8 LS LF
N = Activity Name; AD = Activity Duration
ES = Early Start; EF = Early Finish
LS = Late Start; LF = Late Finish
For Activity J in this example:
Total Float = LF of J – EF of J => 8 – 3 = 5
Free Float = ES of G – EF of J => 5 – 3 = 2
Note: Free float can only occur when two or more activities share a common successor.
Created by: Harwinder Singh Bhatia, PMP
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