Engineering calculators
Reliability Engineering Toolkit
Practical reliability calculations with the equations, assumptions and engineering context shown alongside the result. Built for transparent design, qualification and test-planning work rather than black-box answers.
RDT Sample Size & Test Time
Calculate reliability demonstration test sample size or test time from reliability, confidence, allowable failures and optional Weibull assumptions.
Open calculator Reliability calculationArrhenius Acceleration Factor
Calculate Arrhenius thermal acceleration factor and equivalent use time from activation energy, use temperature and stress temperature.
Open calculator Reliability calculationMTBF, FIT & Reliability
Convert MTBF or MTTF into reliability, failure probability, constant hazard rate and FIT under an exponential life model.
Open calculator Reliability calculationWeibull Reliability & B-Life
Calculate Weibull reliability at time and B-life percentile from beta and characteristic life eta.
Open calculator Reliability calculationPeck Temperature–Humidity AF
Calculate Peck acceleration factor for combined temperature and relative-humidity stress using activation energy and humidity exponent.
Open calculator Reliability calculationCoffin–Manson Thermal Cycling
Estimate simplified thermal-cycle acceleration from use and test temperature ranges and a Coffin–Manson fatigue exponent.
Open calculator Reliability calculationInverse Power Law AF
Calculate inverse-power-law acceleration factor and equivalent exposure from use stress, accelerated stress and exponent n.
Open calculatorHow to use the toolkit
Calculation first. Assumptions visible.
Each calculator states its governing relationship and major assumptions. Results are engineering aids: validate the model, parameter values, stress range and failure mechanism against your own evidence before using them for qualification or release decisions.
The toolkit is deliberately modular: new calculators can be added to the central registry and they automatically appear in the toolkit directory and related-calculation navigation.