Reference desk
Definitions and formulas that keep engineering conversations aligned.
Quick technical references for formulas that recur in reliability, maintenance, availability, life data, and MRO planning.
Maintenance
Maintenance KPI formulas
MTBF, MTTR, backlog, OEE, and ROI.
AvailabilityAvailability definitions
Inherent, operational, and production boundaries.
Life dataWeibull parameters
η, β, reliability, and hazard rate.
MROMRO inventory formulas
Lead-time demand, stock, EOQ, and turnover.
Definitions are part of the result.
Formula names can look identical while data boundaries differ. Use the linked tools and guides to see assumptions before comparing a value across teams or sites.