FPS tempo exposição permitido
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The FPS exposure time calculator estimates how long someone can safely stay in the sun based on their sunscreen's protection factor (FPS) and skin sensitivity. It uses the formula: safe time = FPS × base time (typically 30 minutes for skin type IV). For example, FPS 30 allows up to 90 minutes of continuous exposure without burns, assuming proper reapplication.
This tool is handy for planning outdoor activities like walks or sports, ensuring users reapply sunscreen before protection limits are exceeded. Accuracy depends on correct FPS estimation and skin type classification, which varies based on individual constitution and sunburn history.
Note that this calculator doesn't replace dermatologist advice. Factors like climate, altitude, and water activities may reduce effective protection time. FPS doesn't provide full immunity against UV radiation, especially UVA, requiring additional protective measures like clothing and shade.
Frequently asked questions
How does FPS affect sun exposure time?
The FPS determines protection duration: higher FPS values offer longer protection. For example, FPS 50 lasts twice as long as FPS 25 under the same conditions.
Can I use this calculator for different body areas?
No, the formula assumes even coverage. Areas with reduced sunscreen thickness, like hands or knees, require more frequent reapplication.
Should I consider my skin type when calculating?
Yes, more sensitive skin types (Type I) have shorter safe exposure times, while more resistant types (V-VI) tolerate longer exposure, adjusting the formula automatically in the calculator.
What if I forget to reapply sunscreen?
Reapply immediately and reduce direct sun exposure. Protection isn't cumulative without continuous product coverage on the skin.