UV Exposure Time Calculator

Estimate how quickly sun exposure risk can increase based on UV index, skin type, and sunscreen use.

Use your local UV forecast if available.
Used for a simple sensitivity estimate.
A simple protective multiplier.
How we calculate

We start with a simple baseline exposure tolerance by skin type, then adjust it using UV index and sunscreen.

  • Very fair: most sensitive
  • Medium: moderate sensitivity
  • Darker skin types: lower sensitivity in this simplified model
  • Sunscreen: increases estimated safe exposure time