SunStoke
The Journal
How Long You Can Safely Build Color, by Skin Type and UV Index
Rather than tell everyone the same 'stay under 20 minutes' advice, the Tan Session Time Estimator works out a cautious session cap from your actual skin type and today's UV index — and is upfront that some skin types don't get a tanning session at all, only a burning one.
Your Sunburn Risk Score, Explained With Worked Examples
The Sunburn Risk Score folds UV index, skin type, time outside, SPF, altitude, and reflective surfaces into one 0–100 number. Here's exactly how each factor moves that number, worked out across a beach day, a ski day, and a shaded pool afternoon.
Sun Protection for Babies and Kids: Clothing, Shade, and Sunscreen Basics
Children's smaller bodies and thinner skin change the sunscreen math and shorten the safe-exposure window — and shade and clothing, not sunscreen, are usually the first line of defense. Here's how the site's calculators apply to a child's body, and where this article stops and a pediatrician's advice starts.