Vitamin D: ng/mL to nmol/L
Convert Vitamin D between ng/mL and nmol/L — 25-hydroxyvitamin D is reported in ng/mL in the US and nmol/L elsewhere. Type in either box to convert both ways.
Vitamin D conversion table (ng/mL to nmol/L)
| Vitamin D (ng/mL) | Vitamin D (nmol/L) |
|---|---|
| 10 ng/mL | 24.9601 nmol/L |
| 20 ng/mL | 49.9202 nmol/L |
| 30 ng/mL | 74.8803 nmol/L |
| 40 ng/mL | 99.8404 nmol/L |
| 50 ng/mL | 124.8 nmol/L |
| 60 ng/mL | 149.761 nmol/L |
| 80 ng/mL | 199.681 nmol/L |
How to convert Vitamin D from ng/mL to nmol/L
To convert Vitamin D, multiply ng/mL by 2.496 — 25-hydroxyvitamin D has a molar mass of 400.64 g/mol. For example, 1 ng/mL equals 2.49601 nmol/L. The converter above runs the exact factor at full precision and updates as you type; the swap button flips the direction.
Frequently asked questions
How do you convert Vitamin D from ng/mL to nmol/L?
Multiply ng/mL by 2.496 — 25-hydroxyvitamin D has a molar mass of 400.64 g/mol. For example, 1 ng/mL is 2.49601 nmol/L. The converter above does this instantly and works both ways — type a value in either box. It uses the exact factor at full precision, so the result matches published clinical conversions.
What is a normal Vitamin D level?
25-hydroxyvitamin D of 30–100 ng/mL (75–250 nmol/L) is generally considered sufficient; under 20 ng/mL (50 nmol/L) is deficient. These are general adult figures only — the reference interval on your own lab report is what applies to you, and it can differ by lab, method, age and sex. The conversion table above runs from 10 to 80 ng/mL, or 24.9601 to 199.681 nmol/L, so a range quoted in either system can be lined up against your own figure.
Why is Vitamin D reported in different units?
25-hydroxyvitamin D is reported in ng/mL in the US and nmol/L elsewhere. The two systems describe the same measurement, so a value converts exactly from one to the other with no loss of meaning — only the units and the number change. That is why guidelines, journals and lab reports from different countries quote different numbers for the same Vitamin D result. The two boxes above are labelled ng/mL and nmol/L, so you can read a value in whichever system your own report uses.
Is this Vitamin D converter accurate and free?
Yes — this Vitamin D converter is both accurate and free. It applies the standard, published conversion factor at full double precision in your browser, with nothing uploaded or stored, and there is no sign-up or usage limit. It converts units only and does not interpret or diagnose results.
This is a unit-conversion reference tool, not a diagnosis or medical advice. Reference intervals are general adult guides that vary by laboratory, method and individual — always read your result against the range printed on your own report and discuss it with a qualified healthcare professional.
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