Mean Time To Failure (MTTF) Calculator

Total Hours of Operation (hours):
Total Number of Units:


About Mean Time To Failure (MTTF) Calculator (Formula)

The Mean Time To Failure (MTTF) Calculator is a tool that uses a mathematical formula to determine the average time a system or component is expected to function before it fails.

MTTF is a widely used measure of reliability in engineering and manufacturing, as it provides insight into the expected lifespan of a product or system.

The formula used to calculate MTTF is:


Where MTTF is the mean time to failure (hours/failure),

THO is the total sum of all hours of operation of those units (hours) and TNU is the total number of units in use.

This calculator is useful for engineers, manufacturers, and other professionals who need to evaluate the reliability of a system or component. MTTF can be used to compare different designs, identify potential failure points, and make informed decisions about product development and maintenance.


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