Convert nM to ng/mL, or ng/mL back to nM, using the molecular weight in g/mol, with µM, mM, nmol/L and µg/mL units and common compound presets.
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nM to ng/mL Formula
The following formula converts nanomolar concentration (nM, not nanometres) to nanograms per milliliter. MW here denotes the molar mass of the actual chemical form in g/mol; molar mass is needed because amount concentration and mass concentration are different quantities.
Variables:
- ng/mL is the mass concentration in nanograms per milliliter
- nM is the molar concentration in nanomoles per liter
- MW is the molar mass of the specified compound or chemical form in grams per mole; relative molecular mass, also called molecular weight, is formally dimensionless
To calculate ng/mL, multiply the concentration in nM by the molecular weight of the compound and divide by 1000. If you need to reverse the calculation, use nM = ng/mL × 1000 ÷ MW.
What is nM to ng/mL Conversion?
A value in nM describes how many nanomoles of a substance are present per liter, while ng/mL describes the mass of that substance per milliliter. These units measure concentration in different ways, so the molecular weight of the compound is required to convert between them. Heavier molecules produce a larger ng/mL value at the same nM concentration.
This type of conversion is common in laboratory testing, pharmacology, endocrinology, and biomedical research because assay results may be reported in either molar units or mass-per-volume units depending on the method used.
How to Convert nM to ng/mL?
The following steps outline how to convert nM to ng/mL.
- First, determine the concentration in nanomolar (nM).
- Next, determine the molecular weight (MW) of the molecule in grams per mole.
- Multiply the nM value by the molecular weight.
- Divide the result by 1000 to convert the value to ng/mL.
- Check your answer using the calculator above.
Example Problem:
Use the following values as an example problem to test your knowledge.
Concentration = 10 nM
Molecule = Cortisol
Molecular Weight = 362.46 g/mol
ng/mL = 10 × 362.46 ÷ 1000 = 3.6246 ng/mL
Common Molecular Weights
Some approximate molar masses for the named chemical forms are listed below. Salts, hydrates, conjugates, analogues and modified proteins can have different masses; use the value for the actual analyte rather than assuming a reference value applies to every form.
- Cortisol: 362.46 g/mol
- Estradiol: 272.38 g/mol
- Testosterone: 288.42 g/mol
- Thyroxine (T4): 776.87 g/mol
- Vitamin D3: 384.64 g/mol
- Progesterone: 314.46 g/mol
- Insulin: 5808 g/mol
For example, 10 nM of cortisol is about 3.62 ng/mL, while 10 nM of insulin is about 58.08 ng/mL. The difference exists because insulin has a much higher molecular weight, so the same molar amount represents more mass.
nM to ng/mL Conversion Table
The table below shows how a 10 nM concentration converts to ng/mL for several common molecules using the formula ng/mL = nM × MW ÷ 1000.
| Molecule | Molecular Weight (g/mol) | 10 nM in ng/mL |
|---|---|---|
| Cortisol | 362.46 | 3.62 ng/mL |
| Estradiol | 272.38 | 2.72 ng/mL |
| Testosterone | 288.42 | 2.88 ng/mL |
| Thyroxine (T4) | 776.87 | 7.77 ng/mL |
| Vitamin D3 | 384.64 | 3.85 ng/mL |
| Progesterone | 314.46 | 3.14 ng/mL |
| Insulin | 5808 | 58.08 ng/mL |
Different assays and publications may report an analyte in nM or ng/mL. Molar mass connects these units for the same chemical form, but a unit conversion alone does not establish equivalence between assay results. Check analyte identity, reported dilution state and calibration before comparing values across laboratories or methods.
