UV Index Guide & Calculator
Understand UV Index levels and calculate safe sun exposure times by skin type
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An interactive guide based on World Health Organization (WHO) standards. Estimate safe outdoor exposure duration before sunburn by evaluating skin tone, sunscreen SPF, hat usage, and shade settings.
How to use
- Adjust the slider to set the current UV Index level.
- Select your Fitzpatrick skin type (tonal sensitivity).
- Select your applied sunscreen SPF and any additional physical protection (hat, shade).
- Check your effective exposure UV Index and calculated safe time.
FAQ
- Do I need sunscreen on a cloudy day?
- Yes. Light clouds block only about 20% of UV rays, and cloud edge reflections can sometimes intensify UV radiation levels briefly.
- Does sunscreen mean I can stay out indefinitely?
- No. Sunscreen degrades from sweat, sebum, and rubbing. Health authorities strongly recommend reapplying sunscreen every 2 hours regardless of math predictions.