How do I convert Vitamin D3 (cholecalciferol) from ng/mL to nmol/L?

nmol/L = ng/mL × 2.6. In the other direction: ng/mL = nmol/L × 0.3846.

Which units are used for Vitamin D3 (cholecalciferol)?

Common units are ng/mL, nmol/L.

Iron & vitamins

Vitamin D3 / cholecalciferol (parent form, supplementation control)

Enter a value in any unit and all other units fill in.

ng/mL nmol/L

10 nmol/L = 3.85 ng/mL

nmol/L	nmol/L = ng/mL × 2.6	ng/mL = nmol/L × 0.3846

Vitamin D3 (cholecalciferol) is reported in ng/mL or nmol/L. The page converts between the units only.

nmol/L × 0.3846 = ng/mL (exact factor 0.3846).
No established reference range is listed here; compare your result only with the range printed on your own report.

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Source: PubChem: Vitamin D3 · Last reviewed: 2026-10-19

Note from the source: No established reference range; the page converts units only. Mass-to-amount conversion uses a molar mass of 384.6 g/mol.