What does the SPF number indicate?Updated a year ago
The SPF number on a sunscreen product indicates the level of protection it offers against UVB rays, which are the primary cause of sunburn. Here's what the numbers mean:
SPF 15: Provides protection against approximately 93% of UVB rays.
SPF 30: Offers protection against about 97% of UVB rays.
SPF 50: Blocks approximately 98% of UVB rays.