Vitamin D: ng/mL ⇄ nmol/L
Serum 25-hydroxyvitamin D: nmol/L = ng/mL × 2.496 (often rounded to 2.5) · ng/mL = nmol/L × 0.4.
ng/mL to nmol/L chart
| ng/mL | nmol/L |
|---|---|
| 10 | 25 |
| 12 | 30 |
| 20 | 49.9 |
| 30 | 74.9 |
| 40 | 99.8 |
| 50 | 124.8 |
| 60 | 149.8 |
| 80 | 199.7 |
| 100 | 249.6 |
| 150 | 374.4 |
The NIH Office of Dietary Supplements states: "One nmol/L = 0.4 ng/mL, and 1 ng/mL = 2.5 nmol/L" (vitamin D fact sheet). The exact factor from the molar mass of 25(OH)D is 2.496; results differ only in the decimals.
Unit conversion only — it does not interpret lab results. Converting supplement IU instead? See IU to mg/mcg.
FAQ
How do I convert vitamin D ng/mL to nmol/L?
Multiply by 2.496 (2.5 is the common rounding). Example: 30 ng/mL × 2.496 = 74.9 nmol/L.
How do I convert nmol/L to ng/mL?
Divide by 2.496, or multiply by about 0.4. Example: 75 nmol/L ÷ 2.496 = 30.0 ng/mL.
Why do labs use different units?
US labs usually report 25(OH)D in ng/mL; many other countries use nmol/L. They measure the same thing in different units.
Is this the same as vitamin D IU?
No. IU measures the amount in a supplement; ng/mL and nmol/L measure the concentration in blood. Use the IU to mg converter for supplement labels.
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