Factor of Safety Calculator

Enter the total maximum stress and the current working stress into the calculator to determine the factor of safety.

Factor of Safety Formula

The following formula is used to calculate a factor of safety.

FoS = MS / WS

  • Where FoS is the factor of safety
  • MS is the maximum stress the object can withstand
  • WS is the working stress the structure is rated for or used at

FAQ

What is a factor of safety?

A factor of safety is a term used in engineering to describe the relationship between the maximum stress a structure and hold and the stress the structure is designed to be used at. In other words, the larger the factor of safety the lower the working stress compared to the maximum stress.

What is a good factor of safety?

This is entirely dependent on the application or structure. For less critical components and structures factors of safety of 2 are often used, but when human lives depend on the function of a structure factors of safety of 3+ are usually used.


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