About PERT Calculator
Calculate expected duration and standard deviation using PERT (Program Evaluation Review Technique). Get 95% confidence intervals for project planning.
Frequently Asked Questions
What is PERT estimation?
PERT (Program Evaluation Review Technique) uses three estimates: Optimistic (best case), Most Likely (realistic), and Pessimistic (worst case) to calculate expected duration and account for uncertainty.
How is the expected duration calculated?
Expected = (Optimistic + 4 × Most Likely + Pessimistic) / 6. This weighted average gives more importance to the most likely scenario while accounting for best and worst cases.
What does the 95% confidence interval mean?
The 95% confidence interval (Expected ± 2σ) means there is a 95% probability the actual duration will fall within this range. Use this for realistic project planning.