Annualized loss expectancy

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The annualized loss expectancy (ALE) [1] is the product of the annual rate of occurrence (ARO) and the single loss expectancy (SLE). It is mathematically expressed as:

Suppose that an asset is valued at $100,000, and the Exposure Factor (EF) for this asset is 25%. The single loss expectancy (SLE) then, is 25% * $100,000, or $25,000.

The annualized loss expectancy is the product of the annual rate of occurrence (ARO) and the single loss expectancy. ALE = ARO * SLE

For an annual rate of occurrence of 1, the annualized loss expectancy is 1 * $25,000, or $25,000.

For an ARO of 3, the equation is: ALE = 3 * $25,000. Therefore: ALE = $75,000

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References

  1. "Annualized Loss Expectancy".