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Create your first PERT/CPM project and start planning the critical path.
What is PERT/CPM?
PERT (Program Evaluation and Review Technique) and CPM (Critical Path Method) are project scheduling techniques that map task dependencies and identify the Critical Path — the sequence of tasks that determines the minimum project duration.
Key features
Critical path calculation
Automatically identifies which activities have zero slack and determine the project deadline.
Step-by-step animation
Watch the forward and backward pass unfold with explanations for each step.
ES / EF / LS / LF / Slack
All PERT/CPM values calculated instantly with full visibility into each node.
Free & no sign-up
Everything runs in your browser. No account, no server, no data sent anywhere.
Frequently asked questions
What is the critical path?▾
The critical path is the longest sequence of dependent activities in your project. Any delay in a critical task directly delays the project completion date.
What does slack mean in PERT/CPM?▾
Slack (or float) is the amount of time an activity can be delayed without affecting the project end date. Activities on the critical path have zero slack.
Can I use this tool for free?▾
Yes — entirely free, no sign-up required. Your projects are saved locally in your browser.
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