Vitamin D Calculator
NEWCalculate vitamin D production from sun exposure using Fitzpatrick skin type, UV index by latitude, and Holick-based IU formula. Includes sunburn risk assessment.
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How to use
- 1Enter: skinType,sunMinutes,latitude (e.g. 2,30,40)
- 2Skin type: 1 (very fair) to 6 (very dark)
- 3Latitude: 40=New York, 51=London, 35=Tokyo, 10=Bangkok
- 4Optionally add month: 2,30,40,3
Frequently Asked Questions — Vitamin D Calculator
How much sun do you need for vitamin D?+
For fair skin (Type I-II) at midday in summer: 10–15 minutes of arms and face exposure produces 1,000 IU. Darker skin (Type V-VI) needs 60–90 minutes for the same amount. UV index must be ≥3 for meaningful synthesis.
What are signs of vitamin D deficiency?+
Common symptoms: fatigue, bone/muscle pain, frequent illness, depression, and slow wound healing. The only reliable test is a blood 25(OH)D test. Deficiency defined as <20 ng/mL (<50 nmol/L).