IU to mcg converter

About This Tool

This tool converts International Units (IU) to micrograms (mcg) for select vitamins, prioritizing accuracy and reproducibility. By default, Vitamin D is used if the substance is not specified, with a factor of 0.025 mcg per IU. Users may specify Vitamin A (0.3 mcg per IU) or Vitamin E (667 mcg per IU). The core concept is simple: mcg = IU × factor. Inputs are IU amount, optional substance, and optional decimals for rounding. Outputs include mcg_value and the factor used, presented with the requested precision. Conceptually, the tool references standard conversion factors from recognized guidelines and applies them via a direct multiplication, avoiding manual table lookups. It is designed for professionals who need quick, reliable conversions for dosing validation, product labeling, and research documentation. The value lies in substance-aware factors, default behavior to reduce ambiguity, and clear, machine-friendly outputs that can feed downstream workflows. Use cases include verifying supplement strengths on labels, converting historical guidance, and preparing study materials that require mass-based units. The tool emphasizes transparent conversion logic, explicit substance handling, and robust error handling to prevent invalid results. It does not provide dosing recommendations or regulatory compliance claims; it is a reference calculation resource for accurate unit translation.

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