1. medino.com /
2. Sun Care /
3. FAQs /

Is SPF 100 twice as effective as SPF 50?

No, SPF 100 is not twice as effective as SPF 50. While SPF 50 blocks about 98% of UVB rays, SPF 100 blocks approximately 99%. The difference in protection is minimal, and both provide strong defense against sunburn.

Key points:

• SPF measures how well a sunscreen protects against UVB rays.
• Higher SPF numbers indicate slightly better protection.
• The increase in protection diminishes as the SPF number rises.
• Other factors like application amount and time spent in the sun also affect effectiveness.

This text has been fact-checked for accuracy by medino's clinical team.