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Medicine Unit Converter

Convert between International Units (IU), micrograms (mcg), milligrams (mg), and milliliters (mL) for vitamins, medications, and supplements.

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Medicine Unit Converter

Convert between common medication units including International Units (IU), micrograms (mcg), milligrams (mg), and milliliters (mL).

IU
Conversion Result
0.0
mcg
Conversion Details
Original Value 0.0 IU
Conversion Type Vitamin D
Conversion Factor 40 IU = 1 mcg
Daily Value -

Vitamin Reference Guide

Recommended Daily Allowances (RDA) and conversion factors for common vitamins and supplements.

Vitamin D (Cholecalciferol)
Conversion 40 IU = 1 mcg
RDA: 600-800 IU/day (15-20 mcg)
Upper Limit: 4,000 IU/day (100 mcg)
Forms: D2 (ergocalciferol), D3 (cholecalciferol)
Vitamin E (Tocopherol)
Conversion 1.49 IU = 1 mg (natural)
2.22 IU = 1 mg (synthetic)
RDA: 15 mg/day (22.4 IU natural)
Upper Limit: 1,000 mg/day (1,500 IU)
Forms: Alpha-tocopherol (most active)
Vitamin A (Retinol)
Conversion 1 IU = 0.3 mcg retinol
1 IU = 0.6 mcg beta-carotene
RDA: 900 mcg/day men (3,000 IU)
Upper Limit: 3,000 mcg/day (10,000 IU)
Forms: Retinol, beta-carotene (provitamin A)
Weight & Volume
Metric Conversions 1 g = 1,000 mg
1 mg = 1,000 mcg
Volume Conversions 1 L = 1,000 mL
1 tsp = 5 mL
1 tbsp = 15 mL

Common Dosage Conversions

Quick reference for common medication dosages and their equivalent units.

Vitamin IU Metric RDA %
Vitamin D 400 IU 10 mcg 67%
Vitamin D 1,000 IU 25 mcg 125%
Vitamin E 400 IU 268 mg 1,787%
Vitamin A 5,000 IU 1.5 mg 167%
Vitamin C - 500 mg 556%
Important Disclaimer

This tool is for informational purposes only. Always consult with a healthcare professional before changing medication dosages. Individual needs may vary based on age, health conditions, and other factors.