Vitamin Calculator

The Recommended Daily Allowance (RDA) is the average daily dietary intake level sufficient to meet the nutrient requirements of nearly all (97–98%) healthy individuals in a specific life stage and sex group. It is established by the National Academies of Sciences, Engineering, and Medicine and serves as a goal for daily intake.

Adequate Intake (AI) is used when there is not enough scientific evidence to establish an RDA. It is a recommended average daily intake level based on observed or experimentally determined approximations of nutrient intake by a group of healthy people. AI values are used for vitamins like Vitamin D (in some age groups) and Vitamin K.

Dietary Reference Intakes (DRIs) are a set of reference values used to plan and assess nutrient intakes of healthy people. They include the RDA, AI, Estimated Average Requirement (EAR), and Tolerable Upper Intake Level (UL). DRIs are set by the Health and Medicine Division of the National Academies of Sciences, Engineering, and Medicine.

This calculator uses your age, sex, and life stage to look up the appropriate DRI values established by the National Academies. Depending on available scientific data, it displays either the RDA or AI for each vitamin. Because requirements differ significantly across life stages — especially during pregnancy and breastfeeding — these factors are included as inputs.

Yes, significantly. During pregnancy, requirements for vitamins such as Folate (to 600 mcg DFE), Vitamin D, B6, and B12 all increase to support fetal development. While breastfeeding, Vitamin A, C, and B12 needs also rise to support both the mother's health and breast milk quality. This calculator adjusts all recommendations automatically based on life stage.

Fat-soluble vitamins (A, D, E, and K) are stored in the body's fatty tissues and liver, so they don't need to be consumed every day but can accumulate to toxic levels if over-consumed. Water-soluble vitamins (C and all B vitamins) are not stored in significant amounts and excess is excreted in urine, making regular dietary intake important and toxicity less common.

While this calculator helps identify your recommended intake, whether you need a supplement depends on your actual diet, health conditions, and lab results. It's best to get vitamins primarily from whole foods. Always consult a healthcare professional before starting any supplement regimen, as over-supplementation of certain vitamins (especially fat-soluble ones) can be harmful.

Not exactly. This calculator uses US DRI values from the National Academies. Other countries and organisations — such as the WHO, the EU, and Australia's NHMRC — publish their own dietary reference values which may differ slightly. However, the values are broadly similar as they draw from the same global body of nutritional science research.