Reliability Block Diagram Calculator

Build an RBD from a simple table, visualize the hierarchy, and compute overall system reliability.

Import CSV

1) Input Table

Columns (in order): Component Name, Type (Block, Series, Parallel, KofN), Parent (blank for root), Reliability (0–1, only for Block), k (required for KofN — minimum successes; children must be equal-reliability Blocks).

Component Name	Type	Parent	Reliability (0–1)	k (KofN)
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2) Summary & Result

Overall System Reliability (root):—

Computed from the root node (blank Parent). Series: product of children. Parallel: 1 − Π(1 − rᵢ). KofN: binomial tail sum (all children must have equal Block r).

Click Generate to compute and display node reliabilities.

3) RBD Diagram

Click Generate to render the diagram.

Rules Recap

Component Name is case-sensitive and must be unique.
Type must be exactly one of: Block, Series, Parallel, KofN.
Parent is blank for the top-level system (root); otherwise, it must exactly match an existing name.
Reliability is required only for Block (0–1). Leave blank (or 0) for Series/Parallel; those are computed from children.
Exactly one row must have a blank Parent (the root). All nodes must be reachable from the root. No cycles allowed.

Need help applying this to a real validation program? Contact Reliatools.