Weibull Distribution Calculator

Controls how the failure rate changes over time: a shape below 1 means early failures dominate, exactly 1 a constant rate (the exponential case), and above 1 wear-out failures that become more likely with age.

Stretches the distribution along the time axis: about 63.2% of failures occur before time λ, whatever the shape.

The time (or stress level) to evaluate, in the same units as the scale. The tool reports the probability of failure by x and of survival beyond x.

A cumulative probability between 0 and 1; the tool returns the time by which a fraction p of units will have failed.