About the Critical Path CPM Calculator Online Free Tool

The Critical Path CPM Calculator Online Free Tool evaluates an activity network from task IDs, durations, and predecessor relationships. It reports project duration, critical activities, and early/late schedule values with total float.

How to Use the Critical Path CPM Calculator Online

1. Enter one activity per line as Activity,Duration,Predecessors.
2. Use a hyphen for activities with no predecessor and separate multiple predecessors with a pipe character.
3. Calculate the CPM schedule to get duration, critical activities, and activity timing values.
4. Review the result for dependency mistakes or unexpected float.

Choosing Options Correctly

Activity IDs must be unique, durations must be positive, and dependency links must not contain cycles. Use the same time unit for every duration.

Common Use Cases

• Identify the critical path in a small project network.
• Check early start, early finish, late start, late finish, and total float.
• Debug predecessor relationships before moving a schedule into planning software.

Quick FAQ

Can this replace scheduling software?
No. It is a CPM calculation helper, not a full scheduler with calendars, constraints, and resource leveling.

What happens if dependencies loop?
A circular dependency makes the network invalid because no clear start-to-finish order exists.

What does float mean?
Float is the time an activity can slip without delaying the project finish, based on the entered network.

What input quality matters most?
Durations and predecessor relationships must match the real work logic. Bad logic creates a misleading critical path.