Many UV/vitamin D calculators in English on web/iPad/Smartphone Huge difference between between the calculators in ease of use and what each one considers: ~hs~~hs~ weight, skin color, amount of skin exposed, time of day, age, The calculators typically just estimate the amount of vitamin D intake from sunshine - but some also include intake from supplements and food Some calculators base their estimates of the UV expected for the day at your location - but sometimes this does not include possible clouds. The calculators do not try to estimate the vitamin D level in your book nor how much is needed to PREVENT or TREAT diseases

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VitaminDWiki has a lot more information

• Free, instant test to see if you are very vitamin D deficient - it is not quantitative
• Low cost Vitamin D tests generally $40 to $70. Some can be done at home.
• UB Meters low cost measures all UV, higher cost to measure just UVB (Vitamin D spectra)
• All items in Vitamin D Blog
• Home Page
• List of categories of vitamin D information - with # of items in each
• Published Recommendations
• Reasons for Vit D deficiency
• Low cost and many forms of vitamin D
• Vitamin D 101