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Multiplicative Damage Reduction

Calculate effective damage after two multiplicative mitigation layers.

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02 Your result
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FormulaDamage received = damage*(1-a/100)*(1-b/100); Effective reduction = 100*(1-(1-a/100)*(1-b/100))

How to use this tool

  1. Calculate effective damage after two multiplicative mitigation layers.
  2. Set incoming damage, first reduction, second reduction in the indicated units.
  3. Calculate and compare damage received, effective reduction.

Try this example

{
  "damage": 1000,
  "a": 20,
  "b": 25
}

Accuracy and scope

Idealized educational model. Enter measured values in the displayed units; real systems may require additional corrections. User-defined game-rule arithmetic; no current game mechanics or search-volume claims.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.