Free Web Tool

CPM Float & Critical Path

Add activities with predecessors and durations — computes ES, EF, LS, LF, total float, project duration, and the critical path.

Inputs

Add activities by ID, duration, predecessors (comma-separated). Tool computes ES, EF, LS, LF, Total Float, and identifies critical path.
IDDurPred.ESEFLSLFTF
Method
  • Forward pass: ES = max(EF of preds), EF = ES + Dur.
  • Backward pass: LF = min(LS of succs), LS = LF − Dur.
  • TF = LS − ES = LF − EF. Critical path: TF = 0 throughout.

Results

Project duration—
Critical path—
Activities—