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Calculate International Units

Calculator for international units (IU) for vitamins and insulin. International units are used to measure the masses of medical substances. One international unit of a certain substance always corresponds to a certain mass of that pure substance. The mass is given in milligrams or micrograms, 1 microgram is 1/1000 milligram and 1 milligram is 1/1000 gram.

Substance:	Vitamin A Beta-carotene Vitamin B1 Vitamin C Vitamin D3 Vitamin E Insulin (free from water) Insulin (ultrapure)
International units:		IU
Milligrams:		mg
Micrograms:		μg

Please choose a substance and enter one value, the other values will be calculated.

Of vitamin E, there are may varieties, here is meant the most common form, d-α-tocopherol.

The values in μg per IU are:

Vitamin A: 0,3
Beta-carotene: 0,6
Vitamin B1: 3
Vitamin C: 50
Vitamin D3: 0,025
Vitamin E: 671
Insulin (free from water): 34,7
Insulin (ultrapure): 41,67

as at October 2022