Some sunscreens also include information on their protection against UVA rays, but for the moment, there is no internationally agreed standardized method to measure this action.

The SPF method is governed by tests in vivo and is recognized by the Food and Drug Administration (FDA) U.S. agency charged with evaluating food and drugs, and by The European Cosmetic Toiletry and Perfumery Association (Colipa) of the European Union.

The SPF values can be translated as follows:

* Between 2 and 5 low protection
* Between 6 and 11: average protection
* Between 12 and 19: high protection
* Between 20 and 29: maximum protection
* From 30: extreme protection

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