Preservative Challenge Calculator

Preservative system for target efficacy against microbes.

Batch size (g)

Water activity (aw)

Product pH

Preservative type (1-5)

Preservative level (%)

Rinse-off product? (0/1)

Tab to move between fields

Efficacy score (0-100)

Microbial risk (0-100)

Recommended level (%)1.08

Your preservative (g)10

Recommended amount (g)10.8

pH compatible? (1=yes)1

Concentration adequate? (1=yes)1

Over max limit? (1=yes)0

How to Use This Calculator

Enter the preservative active and its usage level percentage in the formula.
Set the product water activity (Aw) and pH.
Select target preservation standard (USP, EP, or cosmetic challenge test criteria).
Review the predicted preservation efficacy score.
Use the output to decide whether to increase preservative level or add chelating agents before challenge testing.

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