Reliability Test Planner

Design a 'Zero-Failure' qualification test plan according to IEC 61124. Calculate the required sample size and test duration to statistically prove your reliability targets.

Calculate your test strategy.

Confidence vs Test Time Trade-off

Total Test HoursConfidence (%)05k10k15k20k25k5060708090100

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Success Run Theorem

Physical reliability testing burns immense capital and time. For testing uncertainty boundaries after running tests, use our MTBF Confidence Interval Calculator.

MTBF Demonstration

When aiming for continuous operation targets (e.g., "50k hour MTBF"), calculating accumulated test hours proves statistical confidence. By running 10 physical units in parallel for 230 hours, you effectively simulate 2,300 hours of field survival—assuming all 10 survive identically.

Mission Reliability %

When addressing "One-Shot" explosive devices or isolated spacecraft missions, testing calculates rigid Sample Sizes rather than hours. Proving 95% rocket deployment reliability with 90% confidence dictates testing precisely 45 rockets flawlessly prior to launch.

Frequently Asked Questions

The test fails. You have NOT demonstrated the target reliability. You must analyze the failure, fix the root cause, and restart the test (usually with a larger sample size or longer duration to prove the fix).
Yes. This tool calculates 'Equivalent Operating Hours'. If you test at 60°C and your Acceleration Factor (AF) is 10, then 100 actual test hours = 1000 equivalent hours.

Relevant Glossary

Availability

The probability that a system is operating satisfactorily at any point in time. It is a function of reliability (MTBF) and maintainability (MTTR).

B10 Life

The time at which 10% of a population is expected to fail (or 90% reliability). Commonly used for bearings and warranty analysis.

Failure Rate (λ)

The frequency with which an engineered system or component fails, expressed in failures per unit of time. It is the inverse of MTBF (for constant failure rate systems).

MTBC

Mean Time Between Crashes. Typically used in software reliability equivalent to MTBF for hardware.

MTBF

Mean Time Between Failures. The average expected time between repairable failures of a system during normal operation.

MTTR

Mean Time To Repair. The average time required to troubleshoot and repair a failed component and return it to service.

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