Percentage Concentration to Molarity Calculator

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Choose which quantity to calculate.
w/w (most common for concentrated reagents), w/v (common in biology/pharma), or v/v (for miscible liquids such as ethanol-water).
Selecting a preset fills in molar mass and a typical solution density automatically. Choose Custom to enter your own values.
Molecular weight of the solute in grams per mole.
g/mol
Density of the solution (not the pure solute) in g/mL. Required for w/w and v/v; ignored for w/v. For v/v use the density of the pure solute liquid.
g/mL
The percentage concentration of the solution.
%
Molarity
12.0759mol/L

Molar concentration of the solution

Approximate normality (n=1)12.0759eq/L
Molality16.1077mol/kg
Mass concentration440.3g/L
Formula usedM = (p% x density x 10) / Mm
12.0759 mol/L
Very dilute<0.1Dilute0.1-1Moderate1-6Concentrated6-14Very conc.14+

37.00% w/w = 12.0759 mol/L

  • A 37.00% w/w solution of Hydrochloric acid has a molar concentration of 12.0759 mol/L.
  • The solution contains 440.30 g of solute per litre.
  • The molality is 16.1077 mol/kg solvent, which is relevant for colligative properties (boiling point elevation, freezing point depression).
  • Density varies with temperature, so use a value measured at your working temperature for the most accurate result.

Next stepThis is a concentrated solution (12.08 mol/L). Handle with appropriate laboratory safety precautions and dilute before use if a lower concentration is needed.

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