Convert mmol/L to grams, g/L or mg/dL from molar mass and volume, or mmol to grams and back. Pick a common substance or enter its molar mass.

Find solute mass from concentration and final solution volume.

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mmol/L to Grams Formula

The following formula is used to convert mmol/L to grams for a given molar mass and volume.

g = (mmolL × MW × V) / (1000)

Variables:

  • g is the mass in grams
  • mmolL is the concentration in millimoles per liter
  • MW is the molar mass in grams per mole (g/mol)
  • V is the volume in liters

To calculate the mass in grams, multiply the concentration in mmol/L by the molar mass and the volume, then divide by 1000.

How the Conversion Works (Dimensional Analysis)

This is standard unit cancellation: (mmol/L) × (g/mol) × (L) = mmol × g/mol. Since 1 mmol = 0.001 mol, multiplying the numerical values in mmol/L, g/mol and L requires division by 1000 to express the final mass in grams. For authoritative references, check a general chemistry textbook or a university chemistry unit-conversion guide.

mmol/L to Grams Conversion Table (per 1 L solution; g = mmol/L × MW ÷ 1000)
Concentration (mmol/L) Grams (NaCl) Grams (Glucose) Grams (Sucrose)
0.10.0060.0180.034
0.50.0290.0900.171
10.0580.1800.342
20.1170.3600.685
50.2920.9011.712
100.5841.8023.423
201.1693.6036.846
251.4614.5048.558
502.9229.00817.115
754.38313.51225.673
1005.84418.01634.230
1508.76627.02451.345
20011.68836.03268.460
25014.61045.04085.575
30017.53254.048102.690
40023.37672.064136.920
50029.22090.080171.150
75043.830135.120256.725
100058.440180.160342.300
2000116.880360.320684.600
* Rounded to 3 decimals. Formula: grams = (mmol/L × Molecular Weight × Volume) / 1000. Values assume Volume = 1 L. Molecular weights: NaCl = 58.44 g/mol; Glucose = 180.16 g/mol; Sucrose = 342.30 g/mol.

What is mmol/L?

mmol/L stands for millimoles per liter, a unit of concentration that measures the number of millimoles of a substance in one liter of solution. It is commonly used in chemistry and medicine to express the concentration of solutes in a solution. One millimole is equal to one-thousandth of a mole, which is a standard unit in chemistry representing a specific number of molecules or atoms.

How to Convert mmol/L to Grams?

The following steps outline how to convert mmol/L to grams.

  1. First, determine the concentration in mmol/L (mmolL).
  2. Next, determine the molar mass of the substance (MW) in g/mol.
  3. Next, determine the volume of the solution (V) in liters.
  4. Finally, use the formula g = (mmolL * MW * V) / 1000 to calculate the mass in grams.
  5. After inserting the values and calculating the result, check your answer with the calculator above.

Example Problem : 

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

Concentration in mmol/L (mmolL) = 5

Molecular weight (MW) = 180 g/mol

Volume (V) = 2 L