SPF Formulation Calculator

UV filter percentages for target SPF from in-vitro data.

Zinc Oxide (%)

Titanium Dioxide (%)

Avobenzone (%)

Octinoxate (%)

Octocrylene (%)

Batch size (g)

Tab to move between fields

Estimated SPF

28.5

UVB protection (%)

96.5

Broad spectrum? (1=yes)1

Photostable? (1=yes)1

Total UV filters (%)18

Total filter weight (g)18

UVA filters total (%)13

UVB filters total (%)10

How to Use This Calculator

Enter the types and concentrations of UV filters in your sunscreen formula.
Set the formulation vehicle (emulsion, gel, anhydrous).
Review the estimated in-vitro SPF and UVA protection ratio.
Adjust UV filter combinations to achieve the labeled SPF claim.
Note: this provides a formulation estimate -- in-vivo SPF testing per ISO 24444 is required for labeling.

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