Vitamin D Calculator
Calculate Vitamin D Needs
Get your recommended daily vitamin D intake
Formula
RDA: 400 IU (infants), 600 IU (age 1-70), 800 IU (age 70+) | Deficient: up to 4,000 IU | Upper limit: 4,000 IU/day for adults
Frequently Asked Questions
How much vitamin D do I need daily?
The RDA is 600 IU (15 mcg) for ages 1-70 and 800 IU (20 mcg) for adults over 70. Many experts recommend 1,000-2,000 IU daily, especially for those with limited sun exposure. The safe upper limit is 4,000 IU for adults.
What are the signs of vitamin D deficiency?
Common symptoms include fatigue, bone pain, muscle weakness, mood changes (depression), frequent infections, slow wound healing, and hair loss. Many people are deficient without obvious symptoms. A blood test is the only way to know for sure.
Can I get enough vitamin D from the sun?
10-30 minutes of midday sun exposure on arms and legs can produce 10,000-20,000 IU of vitamin D. However, this varies by latitude, season, skin tone, sunscreen use, and cloud cover. People above 37 degrees latitude cannot produce vitamin D from sun in winter months.
You may also need
H
BMI Calculator
Free Body Mass Index (BMI) calculator. Calculate your BMI using metric or imperial units. Understand your BMI category and what it means for your health.
HealthH
Iron Intake Calculator
Free iron intake calculator. Find your recommended daily iron intake based on age, sex, and pregnancy status. Learn about iron-rich food sources and absorption tips.
HealthH
Fiber Intake Calculator
Free fiber intake calculator. Find your recommended daily fiber intake based on age and sex. See how your current intake compares and how to close the gap.
Health