UV Index scale [High UV] — Sep 2025

The UV Index measures the strength of ultraviolet (UV) radiation.

Step 1

SPF 15: Blocks about 93% of UVB rays.

Step 2

SPF 30: Blocks about 97% of UVB rays.

Step 3

SPF 50: Blocks about 98% of UVB rays.

Step 4

Check the UV Index — Look up the daily UV Index in your area before going outside.

Step 5

Choose the Right SPF — Select a sunscreen with at least SPF 30 for adequate protection.

Step 6

Apply Sunscreen Generously — Use about an ounce (a shot glass full) for full body coverage.

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