Enter the concentration in micrograms per milliliter (µg/mL) and select the compound to determine the molarity in mol/L using the molecular weight of the substance.
- ug/l to ng/ml Converter
- iu/ml to ng/ml Converter
- Ng/Ml To Nmol/L Calculator
- Weight Per Volume Calculator
- All Unit Converters
ug/mL to Molarity Formula
The following formula is used to convert a concentration in micrograms per milliliter into molarity.
M = (C × 10^-3) / MW
Variables:
- M is the molarity in mol/L
- C is the concentration in µg/mL
- MW is the molecular weight in g/mol
Since 1 µg/mL = 10-3 g/L, the conversion is performed by first converting the concentration into grams per liter and then dividing by the molecular weight.
M = C / (1000 × MW)
What is ug/mL to Molarity?
Converting ug/mL to molarity means changing a mass-based concentration into a mole-based concentration. A value in µg/mL tells you how much mass of a substance is present in each milliliter of solution, while molarity tells you how many moles of that substance are present in each liter of solution.
This conversion requires the molecular weight of the compound. Different substances with the same µg/mL concentration can have very different molarities because the number of moles depends on how much one mole of the substance weighs.
For example, a 10 µg/mL solution of sodium chloride and a 10 µg/mL solution of albumin do not have the same molarity, because sodium chloride has a much lower molecular weight than albumin.
How to Convert ug/mL to Molarity?
The following steps outline how to convert ug/mL to molarity.
- First, determine the concentration in µg/mL.
- Next, determine the molecular weight of the compound in g/mol.
- Convert µg/mL to g/L by multiplying by 10-3.
- Divide the result in g/L by the molecular weight to obtain mol/L.
- Use the calculator above to quickly check the answer for common compounds.
Example Problem :
Use the following variables as an example problem to test your knowledge.
Concentration = 10 µg/mL
Compound = Sodium chloride (NaCl)
Molecular Weight = 58.44 g/mol
Molarity = (10 × 10-3) / 58.44 = 0.0001711 mol/L ≈ 1.71 × 10-4 mol/L
ug/mL to Molarity Conversion Table
The following table shows approximate molarities for a 10 µg/mL solution of several common compounds.
| Solute | Approx. MW (g/mol) | 10 µg/mL in mol/L |
|---|---|---|
| Sodium chloride (NaCl) | 58.44 | ≈ 1.71 × 10−4 mol/L |
| Potassium chloride (KCl) | 74.55 | ≈ 1.34 × 10−4 mol/L |
| Glucose (C₆H₁₂O₆) | 180.16 | ≈ 5.55 × 10−5 mol/L |
| Urea | 60.06 | ≈ 1.66 × 10−4 mol/L |
| Creatinine | 113.12 | ≈ 8.84 × 10−5 mol/L |
| Caffeine | 194.19 | ≈ 5.15 × 10−5 mol/L |
| Human serum albumin | 66,500 | ≈ 1.50 × 10−7 mol/L |
Laboratory values may be reported in mass concentration units such as µg/mL or in molar units such as mol/L, mmol/L, or µmol/L. Knowing how to convert between them makes it easier to compare measurements, prepare solutions, and interpret research data accurately.