SPF Effective Protection Calculator
Calculate your actual UV protection based on SPF rating, application thickness, and time since application.
Inputs
%
min
Results
Current Effective SPF
1.7
Current UVB Blocked41%
Label UVB Blocked (full application)96.7%
Reapply In20 min
Label SPF30
How to Use This Calculator
- Enter the SPF rating printed on your sunscreen label.
- Set the application amount as a percentage of the recommended 2 mg per cm2 (most people apply about 50%).
- Enter the number of minutes since you last applied sunscreen.
- Toggle the Swimming/Sweating option if you have been in water or exercising.
- Input the current UV Index from your weather app.
- Review Current Effective SPF and Reapply In time to know exactly when to reapply.
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