PERT Chart

Free Online PERT Chart Maker

What is a PERT Chart?

A PERT (Program Evaluation and Review Technique) chart maps the tasks, dependencies, and timeline of a project so you can see exactly what needs to happen and in what order. Each node represents a task with optimistic, most-likely, and pessimistic time estimates, and arrows show which tasks must finish before others can start. PERT charts are essential for identifying the critical path — the longest sequence of dependent tasks that determines your earliest possible finish date. Use one whenever your project has multiple parallel workstreams and you need to spot scheduling bottlenecks before they happen.

Key Features

Critical Path Highlighting

Automatically calculates and color-codes the critical path so you instantly see which tasks have zero slack and must stay on schedule.

Three-Point Time Estimates

Enter optimistic, most-likely, and pessimistic durations per task; the chart computes the weighted expected time using the PERT formula.

Dependency Arrows

Draw task dependencies with directional arrows so predecessors and successors are visually clear at a glance.

Early and Late Start / Finish Times

Toggle on early and late start/finish values per node to expose float and identify scheduling flexibility across your project.

Slack / Float Display

See how much buffer each non-critical task has before it delays the project, helping you reallocate resources confidently.

Flexible Time Units

Switch between hours, days, and weeks to match your project scale without rebuilding the chart from scratch.

Best For

Software development release planning

Construction and engineering project scheduling

Product launch timelines with cross-functional teams

Research projects with uncertain task durations

Event planning with sequential and parallel workstreams

Academic or thesis project milestone tracking

When to Use

When tasks have dependencies and cannot all start at once
When task durations are uncertain and you need probabilistic estimates
When you need to identify which tasks will delay the entire project if they slip
When multiple teams are working in parallel and you need to coordinate hand-offs
When a Gantt chart does not clearly show task dependencies and logical flow
When presenting a project plan to stakeholders who need to see sequencing logic

Common Mistakes

Setting identical optimistic and pessimistic estimates, which defeats the purpose of three-point estimation
Forgetting to link all tasks to a single start and end node, leaving orphaned tasks with no path
Overcrowding the chart with too many micro-tasks — group low-level work into meaningful milestones instead
Ignoring float on non-critical tasks and treating every task as urgent, causing unnecessary team stress
Using calendar dates instead of durations, which makes the chart invalid when the project start date shifts
Confusing PERT with a Gantt chart — PERT shows dependency logic, not a calendar timeline

Related Tools

Create similar charts with these tools

PERT Chart Makerpert-chart

Build PERT charts in minutes. Map task dependencies, calculate critical paths, and visualize project timelines with our free online PERT chart maker.

PERT CPM Chart Makerpert-chart

Build PERT CPM charts instantly. Map task dependencies, calculate critical paths, and visualize project timelines with our free AI-powered PERT chart maker.

AI PERT Chart Generatorpert-chart

Build professional PERT charts in seconds with AI. Map tasks, dependencies, and critical paths instantly. Free online PERT chart generator — no signup needed.

Plan Projects with PERT Chartspert-chart

Build PERT chart project network diagrams instantly. Map task dependencies, find the critical path, and plan timelines — free, no sign-up needed.

Templates

Start with professionally designed templates

Plan Complex Timelines with a Professional pert-chartpert-chart

Map task dependencies, timelines, and critical paths fast with this Pert Chart Template for clearer project scheduling and better delivery planning.

PERT CPM Chart Template for Clearer Project Schedulingpert-chart

Map dependencies, timelines, and critical paths fast with this PERT CPM Chart Template for clear project planning and delivery.

Blank pert-chart Template for Clear Project Schedulingpert-chart

Use this Blank Pert Chart Template to map tasks, dependencies, and timelines fast for clearer planning, risk review, and professional project scheduling.

Plan Projects Faster with a Professional pert-chartpert-chart

Map task dependencies, timelines, and critical paths fast with a professional Pert Chart Template Word workflow for clear project planning.

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