Sun & skin
Vitamin D Calculator
Month, city, skin type, minutes and how much skin is exposed: how much vitamin D your skin makes and whether it is enough in winter.
The estimate uses sun elevation by month and latitude, Fitzpatrick skin type, duration and exposed skin and assumes a clear sky around midday. Production saturates after about 20 minutes. The result is a rough reference; the blood value decides. More in Vitamin D done right.
Not medical advice: the calculator classifies, it does not diagnose.
