Safe time by skin type
Skin type
No sunscreen
SPF 30
SPF 50
Type I
Very fair, always burns
15m
1h 21m
1h 44m
Type II
Fair, usually burns
22m
2h 1m
2h 36m
Type III
Medium, sometimes burns
44m
4h 2m
5h 12m
Type IV
Olive, rarely burns
1h 8m
6h 12m
8h
Type V
Brown, very rarely burns
1h 28m
8h 3m
10h 24m
Sea level, on land, UV held at 4. Sunscreen is counted the way most people apply it (about half the tested amount, roughly the square root of the SPF). Whatever the table says, reapply at least every 2 hours. Snow, sand and water reflect UV and shorten these times. Not medical advice.
What to do at UV 4
Seek shade around midday, wear a hat and sunglasses, and use SPF 30+ sunscreen.
Get a time for your skin, right now
Daisy reads the live UV where you are, follows how it changes through the day, and counts down your safe time for your skin type and sunscreen.
Open DaisyDaisy on your phone
Scan to open Daisy on your phone. The iPhone and Android apps, with a lock-screen countdown and a real alarm, are on their way.
Other UV levels