What this tool does
Per-task O/M/P values derive PERT mean (O+4M+P)/6 and spread; totals aggregate means and approximate 68%/95% bands.
Example input/output
Illustrative sample — your real inputs may look different.
Example input
Task A O=4 M=7 P=12 (hours)
Example output
PERT mean ≈ 7.33h · rolled-up project bands in UI