250 nmol/L to ng/mL Converter
Convert any lab value from nmol/L to ng/mL (or back) for 16 hormones and vitamins - pick the molecule below and this calculator uses its exact molecular weight. Also written "nM" or "nmol/l" on some lab reports - 250 nM and 250 nmol/L mean exactly the same thing.
Common nmol/L Values
Same value, converted for every molecule
| Molecule | MW (g/mol) | 250 nmol/L in ng/mL |
|---|---|---|
| Vitamin D (25-Hydroxyvitamin D) | 400.64 | 100.16 ng/mL |
| Testosterone | 288.42 | 72.105 ng/mL |
| Estradiol (E2) | 272.38 | 68.095 ng/mL |
| Cortisol | 362.46 | 90.615 ng/mL |
| Progesterone | 314.47 | 78.6175 ng/mL |
| Vitamin A (Retinol) | 286.45 | 71.6125 ng/mL |
| Vitamin E (Alpha-Tocopherol) | 430.71 | 107.6775 ng/mL |
| Aldosterone | 360.45 | 90.1125 ng/mL |
| Dehydroepiandrosterone (DHEA) | 288.42 | 72.105 ng/mL |
| DHEA-Sulfate (DHEA-S) | 368.49 | 92.1225 ng/mL |
| Vitamin B12 (Cobalamin) | 1355.4 | 338.85 ng/mL |
| Folate (Folic Acid) | 441.4 | 110.35 ng/mL |
| Melatonin | 232.28 | 58.07 ng/mL |
| Thyroxine (T4) | 776.87 | 194.2175 ng/mL |
| Triiodothyronine (T3) | 651.01 | 162.7525 ng/mL |
| Androstenedione | 286.41 | 71.6025 ng/mL |
Each row uses the same value entered above, converted with that molecule's own molecular weight. Custom molecular weight isn't included here since it has no fixed value of its own.
Lab results for Vitamin D sometimes come back in nmol/L instead of ng/mL, which makes it hard to compare against a ng/mL reference range. Here’s how 250 nmol/L becomes ng/mL.
-> Multiply 250 nmol/L by the molecular weight of Vitamin D, 400.64 g/mol: 250 × 400.64 = 100160.
-> Divide that result by 1000 to convert nanomoles to nanograms: 100160 ÷ 1000 = 100.16.
That’s 100.16 ng/mL for 250 nmol/L. The calculator above updates instantly if you want to try another value.
