Vitamin D Converter (ng/mL ↔ nmol/L)
Convert 25-hydroxy-vitamin-D results between US ng/mL and SI nmol/L with the 2.496 factor.
Multiply ng/mL by 2.496 for nmol/L (the factor shown is its inverse, 0.4008). Anchors: 30 ng/mL = 75 nmol/L (sufficiency), 20 ng/mL = 50 nmol/L (deficiency line). US labs report ng/mL, Europe/India often nmol/L — so '75' on one report and '30' on another can mean exactly the same level. Interpretation and supplementation are clinician decisions; this just translates the number.
Formula
Reference aid for healthcare professionals only. Every result must be independently verified before clinical use. Never use this tool for self-medication or to replace clinical judgement.
Convert 25-hydroxy-vitamin-D results between US ng/mL and SI nmol/L with the 2.496 factor. The Vitamin D Converter (ng/mL ↔ nmol/L) is a free, private vitamin d ng/ml to nmol/l tool — every result computes instantly in your browser with no sign-up and no data upload.
About Vitamin D Converter (ng/mL ↔ nmol/L)
Multiply ng/mL by 2.496 for nmol/L (the factor shown is its inverse, 0.4008). It applies nmol/L = ng/mL ÷ 0.4008 (molar-mass factor). Use the Vitamin D Converter (ng/mL ↔ nmol/L) to get an instant, clearly-explained result with the working shown step by step — free, private and with the source method cited.
How to use Vitamin D Converter (ng/mL ↔ nmol/L)
- 1Enter your details in the Vitamin D Converter (ng/mL ↔ nmol/L) input fields above.
- 2The result updates instantly with the working and reference bands shown.
- 3Adjust any value to explore how it changes the outcome — it's free and unlimited.
Why use Vitamin D Converter (ng/mL ↔ nmol/L)?
- ✓Instant vitamin d ng/ml to nmol/l result that recomputes as you type — no waiting, no page reloads
- ✓100% client-side: your health data never leaves your browser
- ✓Shows the actual formula and your numbers substituted in, so you can see exactly how the result is reached
- ✓Based on published, citable sources (Endocrine Society / IOM vitamin D reference values)
- ✓Free forever with no sign-up, account or app install
Frequently asked questions
How does the Vitamin D Converter (ng/mL ↔ nmol/L) work?+
Multiply ng/mL by 2.496 for nmol/L (the factor shown is its inverse, 0.4008). The calculation uses the formula: nmol/L = ng/mL ÷ 0.4008 (molar-mass factor). Everything runs instantly in your browser as you type — your inputs are never uploaded.
Is the Vitamin D Converter (ng/mL ↔ nmol/L) accurate, and what is it based on?+
The method is traceable to authoritative sources: Endocrine Society / IOM vitamin D reference values. Results are estimates — individual variation always applies, so treat the output as a well-grounded starting point.
Is the Vitamin D Converter (ng/mL ↔ nmol/L) free and private?+
Yes. It's completely free with no sign-up, and all computation happens locally in your browser, so none of your health data ever leaves your device.
Can I use this for medical decisions?+
This is a reference aid for healthcare professionals and must be independently verified. It is not for self-diagnosis or self-medication.
What can I use the Vitamin D Converter (ng/mL ↔ nmol/L) for?+
It's commonly used for vitamin d ng/ml to nmol/l, 25-oh vitamin d converter, vitamin d units. Convert 25-hydroxy-vitamin-D results between US ng/mL and SI nmol/L with the 2.496 factor.
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