Estimate finish dates with workload, velocity, and buffers. Track confidence, holidays, efficiency, and dependency delays. Plan commitments with clearer timelines for every project milestone.
The page stays single-column, while the calculator uses 3 columns on large screens, 2 on smaller screens, and 1 on mobile.
These sample rows illustrate how workload, velocity, and risk conditions influence the forecast.
| Scenario | Total Units | Completed | Velocity/Day | Efficiency | Risk Buffer | Rework | Working Days/Week | Predicted Finish |
|---|---|---|---|---|---|---|---|---|
| Website Relaunch | 240 | 96 | 12 | 88% | 15% | 8% | 5 | Baseline: 42 days from status date |
| ERP Migration | 420 | 210 | 14 | 82% | 20% | 10% | 5 | Baseline: 55 days from status date |
| Mobile App Rollout | 180 | 120 | 11 | 92% | 10% | 4% | 6 | Baseline: 18 days from status date |
Remaining Scope = Total Scope − Completed Scope
Effective Velocity = (Average Daily Velocity × Team Efficiency) ÷ Complexity Index
Adjusted Remaining Scope = Remaining Scope × (1 + Scope Change) × (1 + Rework) × Complexity Index
Base Workdays = Adjusted Remaining Scope ÷ Effective Velocity
Total Buffer Days = Risk Buffer Days + Confidence Buffer Days + Manual Buffer Days
Baseline Calendar Days = (Baseline Workdays × 7 ÷ Working Days Per Week) + Dependency Delays + Holidays
Predicted Delivery Date = Status Date + Baseline Calendar Days
On-Time Probability is a weighted planning score using progress, efficiency, risk, rework, scope volatility, and dependency pressure.
Enter the project name, start date, status date, and optional target due date.
Provide total scope units and completed units. Use tasks, tickets, points, pages, or any consistent measurement.
Add average daily velocity, team efficiency, rework, expected scope change, and complexity index.
Include dependency delays, holiday days, working days per week, confidence level, and manual buffer.
Press Predict delivery date. Review baseline, optimistic, and conservative dates. Then download the results as CSV or PDF.
Use one consistent unit across the project. Tasks, tickets, story points, deliverables, pages, or test cases all work if total and completed scope use the same unit.
The complexity index adjusts productivity. Values above 1.00 reduce effective velocity because each unit needs more effort. Lower values indicate simpler work.
Rework captures fixes, revisions, approvals, retesting, and defect cleanup. Higher rework increases the adjusted remaining scope and usually pushes delivery later.
Risk buffer is calculated from uncertainty. Manual buffer is an additional management cushion added for governance, external approvals, leadership expectations, or special events.
It combines completion progress, efficiency, delays, rework, complexity, scope volatility, and target-date variance. Treat it as a planning signal, not a promise.
Yes. The calculator still predicts delivery dates. Without a target, it labels schedule condition using internal performance and risk signals only.
The status date starts the prediction window. The project start date helps show elapsed time and provides useful context for project progress.
Update the values whenever scope, staffing, velocity, dependencies, or holidays change. Frequent refreshes improve planning visibility and stakeholder reporting quality.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.