Vitamin D unit converter
Convert vitamin D between ng/mL and nmol/L. Type in either box. The factors come from our catalog and are checked by code.
AI-verified against cited sources. Awaiting expert reviewLast reviewed 2026-10-03
1 ng/mL = 2.496 nmol/L. Nothing you type here leaves your browser.
The conversion
- 1 ng/mL = 2.496 nmol/LFrom ng/mL to nmol/L: multiply by 2.496. Back again: divide by 2.496.
Mass and molar units are linked by the molecular weight: 400.64 g/mol (25-hydroxyvitamin D3 (calcifediol), C27H44O2).
Common values
From zero to about twice the usual upper limit, plus the usual limits themselves.
| ng/mL | nmol/L |
|---|---|
| 12 | 30 |
| 20 | 50 |
| 30 | 75 |
| 50 | 125 |
| 100 | 250 |
| 150 | 374 |
| 200 | 499 |
| 250 | 624 |
| 300 | 749 |
Usual ranges in each unit
What labs print as the reference range, by who was tested. Sources for each range are on the Vitamin D page.
| Who | ng/mL | nmol/L |
|---|---|---|
| Adults | 30–100 | 75–250 |