How do I convert IU to mcg?

Divide IU by 40 to get mcg (e.g., 800 IU ÷ 40 = 20 mcg). Supplement labels sometimes list one unit and sometimes the other, so check which unit your label uses.

Why is vitamin D intake often low?

Vitamin D is naturally present in few foods, and most people rely on sun exposure or fortified foods/supplements — indoor lifestyles and sunscreen use can reduce natural synthesis.

Vitamin D Daily Value (%DV) Calculator

Calculate the Percent Daily Value (%DV) of vitamin D in a food or supplement based on the current FDA reference daily intake of 20 mcg (800 IU), helping you track intake for bone health and immune function.

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% Daily Value: 50%

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Formula

%DV = (Vitamin D mcg / 20 mcg) × 100

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Metabolic Rate and Daily Nutrient Tracking

Katch-McArdle BMR, calcium, iron, and vitamin D daily values, and protein per meal — five calculations for tracking metabolism and micronutrient targets.

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