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PERT Calculator
PERT Calculator
Three-point estimation using PERT (Program Evaluation and Review Technique)
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Tasks
PERT Formula:
E = (O + 4M + P) / 6 | σ = (P - O) / 6 | 95% = E ± 2σ
Unit:
Hours
Days
Weeks
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Tasks (2)
Example: Backend API
O=2 M=4 P=8
4.33
±1.00
Example: Frontend UI
O=3 M=5 P=10
5.50
±1.17
Estimates
2 tasks, ~9.83 days
Project Total
Expected Duration
9.83 days
Standard Deviation
±1.54 days
95% Confidence
6.76 - 12.91
6.76
9.83 (E)
12.91
Task
O
M
P
E
σ
Example: Backend API
2
4
8
4.33
1.00
Example: Frontend UI
3
5
10
5.50
1.17
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