Molarity Calculator

Calculate molarity (moles per liter) from mass, molecular weight, and solution volume. Essential for preparing laboratory solutions.

Inputs

Solute Mass

Molecular Weight

g/mol

Solution Volume

Tab to move between fields

Results

Molarity

1 M

Moles of Solute1 mol

Millimolarity1,000 mM

Concentration58.44 g/L

How to Use This Calculator

Enter solute mass in grams and molecular weight (g/mol).
Set solution volume in liters.
Review Molarity (M), Moles of Solute, Millimolarity (mM), and Concentration (g/L).

How the result changes with Molecular Weight

Molecular Weight	Molarity
10,000	0.00584 M
35,000	0.00167 M
65,000	0.0009 M
90,000	0.00065 M

What each input means

Solute Mass: Mass of solute dissolved in the solution (e.g., 58.44 g for 1 mol NaCl)
Molecular Weight: Molar mass of the solute — find on the periodic table or compound data sheet
Solution Volume: Total volume of the solution in liters (1 L = 1000 mL)

How this is calculated

Formula

M = (mass / MW) / V

Worked example, using the default values

Identify Input Parameters
Solute Mass = 58.44, Molecular Weight = 58.44, Solution Volume = 1 = 3 input(s) provided
Calculate Molarity
Molarity
1 = 1
Calculate Moles of Solute
Moles of Solute
1 = 1
Calculate Millimolarity
Millimolarity
1000 = 1000

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