The next paragraphs provides details on RBD calculation formulas.

You may find the information about reliability and availability calculations of individual blocks: Reliability Distributions , Availability Distributions.

Calculation of basic configurations like serial and parallel connection between blocks is described in the Basic calculations paragraph.

K-out-of-N blocks calculation is explained separately by paragraphs K-out-of-N With Repair and K-out-of-N Without Repair.

Equivalent Lambda/FR/MTBF according to RIAC Reliability Toolkit is explained in paragraph Equivalent Lambda/MTBF.