Reliability (probability of survival) calculator

Chance of running a period without failure, given MTBF.

Calculating…

How it's calculated

R(t) = e^(−t ÷ MTBF)

This assumes a constant failure rate, which is reasonable for complex equipment with many failure modes. It does not fit wear-out parts such as bearings, belts and seals, whose failure rate rises with age.

A counterintuitive result: running for exactly one MTBF gives only a 37% chance of no failure.