This guide explains U.S. sunscreen label terms and general use directions. FDA says SPF primarily indicates UVB sunburn protection, while broad-spectrum labeling indicates protection against both UVA and UVB radiation.[2]
Key takeaways
Key takeaways
- SPF indicates sunburn protection and primarily reflects UVB protection; it does not tell you how long you can stay in the sun.[2]
- Broad-spectrum labeling indicates protection against both UVA and UVB radiation.[2]
- AAD recommends broad-spectrum, water-resistant sunscreen with SPF 30 or higher; SPF 30 filters about 97% of UVB rays.[1]
What the label means
AAD explains that SPF describes UVB filtering: SPF 15 filters about 93% and SPF 30 about 97% of UVB rays. No sunscreen filters 100%. Broad-spectrum labeling adds UVA as well as UVB protection.[1]
What to look for
AAD recommends three label features together: broad-spectrum protection, SPF 30 or higher, and water resistance. This page does not rank mineral, chemical, or hybrid filters, and it does not claim that one format is best for everyone.[1]
Application and reapplication
FDA general directions say to apply sunscreen 15 minutes before sun exposure, use enough to cover exposed skin, and reapply at least every two hours and more often when swimming or sweating. For an average-size person, FDA describes at least one ounce to cover exposed face and body.[2]
What sunscreen does not replace
FDA advises using sunscreen together with other sun-protection measures, including protective clothing, hats, sunglasses, and limiting time in intense sun.[2]
Common questions
Does a higher SPF tell me how much longer I can stay in the sun?
No. FDA says SPF is related to the amount of solar exposure that causes sunburn, not directly to time outdoors. Reapplication and other protection still matter.[2]
Does SPF alone describe UVA protection?
No. FDA says SPF primarily indicates UVB protection. Look for broad-spectrum labeling for both UVA and UVB protection.[2]
Sources
- 1.How to decode a sunscreen label — American Academy of Dermatology. Accessed Aug 27, 2026.
- 2.Sunscreen: How to Help Protect Your Skin from the Sun — U.S. Food and Drug Administration. Accessed Aug 27, 2026.
Science terms in this guide
This guide explains U.S. sunscreen label terms and general use directions. FDA says primarily indicates sunburn protection, while broad-spectrum labeling indicates protection against both and UVB radiation. Key takeaways What the label means AAD explains that SPF describes UVB filtering: SPF 15 filters about 93% and SPF 30 about 97% of UVB rays. No sunscreen filters 100%. Broad-spectrum labeling adds UVAMore guides
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