High Quality Content by WIKIPEDIA articles! Factor of safety is a term describing the structural capacity of a system beyond the applied loads or actual loads. Essentially, how much stronger the system is than it needs to be for a given load. Safety factors are often calculated using detailed analysis because comprehensive testing is impractical on many projects, such as bridges and buildings, but the structure's ability to carry load must be determined to a reasonable accuracy. Many systems are purposefully built much stronger than needed for normal usage to allow for emergency situations, unexpected loads, misuse, or attrition. There are several ways to compare the factor of safety for structures. All the different calculations fundamentally measure the same thing, how much extra load beyond what is intended a structure will actually take (or be required to withstand). The difference between the methods is the way in which the values are calculated and compared. Safety factor values can be thought of as a standardized way for comparing strength and reliability between systems.

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