Calculate the missing value between concentration in M, mM or μM, molar mass in g/mol or kg/mol, and concentration in μg/mL or mg/mL.

Convert molar concentration using the solute’s molar mass.

mM = mmol of solute per liter of final solution.

Use the actual chemical form, including any salt or hydrate.

Display precision

Display rounding only. Very small or large values use scientific notation.

mM To µg/mL Formula

The following formula converts millimolar (mM, or mmol/L) to micrograms per milliliter (µg/mL), using molar mass in g/mol.

µg / mL = mM × MW

Variables:

  • µg/mL is the mass concentration in micrograms per milliliter
  • mM is the concentration in millimolar
  • MW is the molar mass of the substance (g/mol)

Multiply concentration in mM by molar mass in g/mol to obtain µg/mL directly. The units mmol/L × g/mol give mg/L, which equals µg/mL; no extra factor of 1000 is needed.

mM to μg/mL Conversion Table (Assumes NaCl, MW = 58.44 g/mol)
Molarity (mM) μg/mL mg/mL
0.15.8440.006
0.529.2200.029
158.4400.058
2116.8800.117
2.5146.1000.146
5292.2000.292
10584.4000.584
12.5730.5000.731
201168.8001.169
251461.0001.461
301753.2001.753
402337.6002.338
502922.0002.922
603506.4003.506
754383.0004.383
1005844.0005.844
1508766.0008.766
20011688.00011.688
25014610.00014.610
50029220.00029.220
* Rounded to 3 decimals. Assumes sodium chloride (MW = 58.44 g/mol). Formula: μg/mL = mM × MW; mg/mL = μg/mL ÷ 1000 (and μg/mL ≡ mg/L).

What Does “mM to µg/mL” Mean?

mM to µg/mL converts amount concentration to mass concentration. Millimolar means millimoles of solute per liter of final solution (mmol/L); molar (M) means moles per liter (mol/L). Micrograms per milliliter means solute mass per final solution volume. The conversion requires the molar mass of the actual chemical form in g/mol.

How to Calculate mM To µg/mL?

The following steps calculate mass concentration in µg/mL using µg/mL = mM × MW, with molar mass MW in g/mol.

  1. First, determine the concentration in millimolar (mM, or mmol/L).
  2. Next, determine the molar mass of the actual chemical form (MW) in grams per mole (g/mol).
  3. Multiply concentration in mM by molar mass in g/mol.
  4. Read the result directly in µg/mL. Do not multiply it by 1000; mg/L and µg/mL have the same numerical value.
  5. The result is the solute mass concentration in micrograms per milliliter (µg/mL).

Example Problem:

Use the following variables as an example problem to test your knowledge.

Concentration in millimolar (mM) = 5

Molar mass (MW) = 10 g/mol. The mass concentration is 5 × 10 = 50 µg/mL (0.05 mg/mL).