What you need: just your age and typical sun exposure β a known supplement dose or blood level is optional.
Vitamin D Reference Range Calculator
How to use this calculator
Enter your age and rough sun exposure. If you know your current supplement dose or a recent 25(OH)D blood level, add those too for a more specific picture.
What your result means
This shows general population reference ranges from the NIH Office of Dietary Supplements (RDA 600 IU/day for most adults, 800 IU/day for 71+; Tolerable Upper Intake Level 4,000 IU/day) β not a personalized prescription. It deliberately never suggests a dose above that Upper Limit, and if your known blood level is low, it points you to a doctor for a monitored repletion plan rather than a specific self-directed dose, since correcting an actual deficiency safely needs monitoring a doctor can provide.
aweGene provides general wellness information for educational purposes only β it is not medical advice, diagnosis, or treatment. Always consult a licensed physician before making health decisions.
Questions and answers
What vitamin D level is considered adequate?
The US NIH Office of Dietary Supplements describes levels below 12 ng/mL (30 nmol/L) as deficient and 20 ng/mL (50 nmol/L) or above as adequate for most people.
How much vitamin D should I take?
That depends on your blood level and health. This tool shows general reference ranges only and does not give a personal dose. The adult upper limit is 4,000 IU (100 mcg) a day.
aweGene tools are educational estimates and do not replace professional medical advice.
Sources and background reading
The methods and ideas behind this tool. aweGene calculators are educational estimates, not clinical implementations. Links open PubMed or the publisher.
National Institutes of Health, Office of Dietary Supplements. Vitamin D: fact sheet for health professionals. Open →
