Skin tone
Location/latitude
Sun exposure today (minutes)
Your age
Result (click to copy)
Frequently Asked Questions
How much sun do I need for vitamin D?
At midday in summer with arms and legs exposed: fair skin 10-15 min, medium skin 15-25 min, dark skin 25-40 min, very dark skin 40-60 min. After this, UV exposure doesn't produce more vitamin D — it just increases skin damage risk.
What causes vitamin D deficiency?
Limited sun exposure (office work, winter, high latitude), dark skin tone, age (skin produces less vitamin D with age), obesity (vitamin D stored in fat), kidney/liver problems, and certain medications. About 1 billion people worldwide are vitamin D deficient.
What are symptoms of vitamin D deficiency?
Fatigue, bone pain, muscle weakness, depression, and frequent illness. Severe deficiency causes rickets in children and osteomalacia in adults. Blood test (25-hydroxyvitamin D) is the only way to confirm deficiency.