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Three-Point Estimator
Estimate project duration using PERT three-point estimation technique
Best Case
Realistic
Worst Case
10.0
PERT Formula: (O + 4M + P) / 6
2.5
Uncertainty Measure
6.25
Risk Measure
How to Use This Tool
1
Enter Three Estimates
Provide optimistic, most likely, and pessimistic time estimates.
2
Calculate Expected Time
PERT formula: (O + 4M + P) / 6 gives weighted average.
3
Assess Uncertainty
Standard deviation shows estimate reliability and risk.
Example
Input
O: 5 days, M: 10 days, P: 20 days
Output
Expected: 10.8 days ± 2.5 days
Pro Tips
- Optimistic = 10% chance of beating
- Most likely = most probable outcome
- Pessimistic = 10% chance of exceeding