- Soma
- Lab unit converter
- ng/mL to nmol/L
ng/mL to nmol/L
There is no single ng/mL to nmol/L factor. ng/mL counts the mass of a substance, nmol/L the number of its molecules, so the factor depends on the substance’s molar mass. Here are the 3 lab tests Soma converts in these units.
Tests and factors
| Test | Units | US → SI | SI → US | Molar mass |
|---|---|---|---|---|
| Vitamin D, 25-OH | ng/mL ⇄ nmol/L | × 2.496 | × 0.40064 | 400.64 g/mol |
| Folate | ng/mL ⇄ nmol/L | × 2.2655 | × 0.4414 | 441.4 g/mol |
| Progesterone | ng/mL ⇄ nmol/L | × 3.1801 | × 0.31446 | 314.46 g/mol |
The molar masses are the ones the Soma app converts with; each links to its compound on PubChem (U.S. National Library of Medicine). HbA1c uses the IFCC–NGSP master equation instead of a molar mass. Urea nitrogen counts the two nitrogen atoms of urea; phosphate is measured as phosphorus. Prolactin and insulin have no molar mass in these units: each uses the factor of the international standard its tests are calibrated to. ALT and AST count enzyme activity: 1 µkat/L is 60 U/L by definition. Mention of a source doesn’t mean it endorses Soma.
nmol/L = ng/mL × 2.496 · molar mass 400.64 g/mol
Vitamin D, 25-OH: formula and common values →This converter changes units only. It doesn’t tell you whether a number is in or out of any range: that depends on the range printed by your own lab, and on your doctor. Soma does not diagnose and is not medical advice.
Questions
Why is there no single ng/mL to nmol/L factor?
Going from mass to molecules needs the mass of one mole of the substance, and every substance has its own. So each test has its own factor: Vitamin D, 25-OH: multiply ng/mL by 2.496; Folate: multiply ng/mL by 2.2655; Progesterone: multiply ng/mL by 3.1801.
How do I convert ng/mL to nmol/L?
Find your test in the table and multiply by its factor; to go back, multiply by the other one. For example, 30 ng/mL of vitamin D, 25-OH is 74.9 nmol/L.
By unit pair
Soma converts straight from the PDF
Share a lab report to Soma, and it reads every row on your phone and converts the units for you, so a Quest result in mg/dL and a Synlab result in mmol/L sit on one chart, each against its own lab’s range. No account, nothing uploaded.