serum vitamin D ng/ml] = 427.46(1+pigmentation grade)**0.5 +(dose IU/day)**0.5/Body mass index

• One of many Body mass index claculators on the web

Pigmentation grade: 2 = light, 1= intermediate, 0 = dark

Equation was for people living in Connecticut = latitude 41 N

Here is the chart showing how close/far the equation was

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