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Option to use other unit than IU for measurement of vitamin A and D

In a lot of countries (Norway(where i live) included) the International Unit for fat soluble vitamins A and D (and E) IU isn't commonly used on nutrition labels, mg or µg is used instead. This makes it hard for me (and probably others as well) to add custom foods since I then have to go online and find the conversion rate of each specific vitamin.

"IU
The IU is an International Unit, usually used to measure fat soluble vitamins including Vitamin A, D and E.
The conversion of IU to mg varies depending on the nutrient.

VITAMIN A
One milligram of beta carotene = 1667IU of Vitamin A activity.
15mg of beta carotene = 25,000IU of Vitamin A activity.
VITAMIN E
One milligram of Vitamin E = approx 1.21 to 1.49IU (depending on the carrier).
400IU of d-alpha tocopherol = 268mg.
VITAMIN D
One microgram of Vitamin D = 40IU.
400IU of Vitamin D = 10ug."
Source: Viridian Nutrition

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