Factor of Safety Calculator

Your details

Choose which quantity to solve for; the others become inputs.
Yield strength is used for ductile designs (no permanent deformation allowed). Ultimate strength is used for brittle materials or where fracture is the failure mode.
Selecting a preset fills the maximum strength field with the standard Sy or Sut value in the active unit system. You can override it manually.
The load or stress at which the part fails (yield stress, ultimate stress, or ultimate load). Hidden when solving for this value.
MPa
The actual stress or load the component experiences in service.
MPa
Factor of safetyAcceptable for most applications
2.5

Maximum strength divided by working load

Margin of safety150%
UnitsMPa
2.5
Unsafe<1Marginal1-1.5Acceptable1.5-3Conservative3-6Very high6+

Factor of safety is 2.500.

  • This range is typical for general engineering design with well-understood loads, reliable materials, and non-catastrophic failure consequences.
  • The margin of safety is 150.0% - the component can carry 150.0% more load than the working value before reaching the failure limit.
  • With a maximum strength of 250.0 MPa and a working load of 100 MPa, the part has 150.0 MPa of residual capacity.

Next stepCross-check against applicable design standards (ASME, Eurocode, AISC) and verify that the working load accounts for dynamic, thermal, and fatigue effects.

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