// reliability test bench
PRODUCT_FAILURE_RATE.CALC
Enter field data to compute failure rate, MTBF, annualized failure rate (AFR), and one-year reliability — plotted against the classic bathtub curve of product life.
field data
computed reliability metrics
Failure rate (λ)
0.000
per 1,000 unit-hours
MTBF
0
hours
Annualized failure rate
0%
failures per unit-year
Reliability at 1 year
0%
R(t) = e^(−λt)
bathtub curve — field life position
Metrics assume a constant hazard rate (exponential life distribution), the standard simplification for the useful-life phase. Early-life and wear-out failures follow different distributions in practice — the curve position is illustrative, not a Weibull fit.