Vitamin A Calculator

Written by Great Medico

Updated September 24, 2026 •2 min read

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Nutrition planning gets easier when a broad goal is translated into a concrete daily number. Vitamin A Calculator does that using only the inputs and rules implemented in this tool.

What this calculator does

Vitamin A appears in several forms, and international units do not convert to retinol activity equivalents, or RAE, with one universal factor. This calculator converts and totals the specific vitamin A forms shown. Nutrition equations are planning tools: real energy and nutrient needs still vary with physiology, goals, health conditions, and the quality of the input data.

How to use it

Choose age and gender, then enter any vitamin A amounts you have for retinol, dietary beta-carotene, supplemental beta-carotene, and dietary alpha-carotene/beta-cryptoxanthin. You may use the paired IU or RAE fields supported by the converter; avoid entering the same source twice in both forms.

How the calculation works

The engine uses its stored conversion factors: retinol 1 IU = 0.3 micrograms RAE, dietary beta-carotene 1 IU = 0.05 micrograms RAE, supplemental beta-carotene 1 IU = 0.3 micrograms RAE, and dietary alpha-carotene/beta-cryptoxanthin 1 IU = 0.025 micrograms RAE. It totals the RAE and compares with the age/sex reference shown.

Example

For the sample values prefilled in this calculator, the primary result is 2400 µg RAE (Total vitamin A activity), Retinol RAE is 900 µg, and Dietary beta-carotene RAE is 300 µg. This example is there to show how the inputs flow through the implemented equation; replace the sample values with your own measurements before using the result.

How to interpret the result

The total helps put mixed vitamin A sources onto one RAE scale. It is useful for label or diet arithmetic, especially when retinol and carotenoids are entered separately.

Limitations and notes

Vitamin A source matters for both conversion and safety. The calculator does not evaluate pregnancy, liver disease, supplement toxicity risk, or upper intake limits, and it should not be used to justify high-dose preformed vitamin A supplementation.