Molarity Calculator

Calculate molarity, moles, volume, and mass for chemical solutions. Includes dilution calculations and common compound database.

Calculation Mode

Choose what you want to calculate

Input Parameters

Enter the known values for your calculation

Common Compounds (Optional)

Moles (mol)

Volume

Unit

Mass (grams)

Molecular Weight (g/mol)

Solvent Density (g/mL)

Used for molality and % by weight calculations

Common Compounds

Molecular weights of frequently used compounds

NaCl

Sodium Chloride (NaCl)

58.44 g/mol

H₂O

Water (H₂O)

18.02 g/mol

C₆H₁₂O₆

Glucose (C₆H₁₂O₆)

180.16 g/mol

C₂H₅OH

Ethanol (C₂H₅OH)

46.07 g/mol

CH₃COOH

Acetic Acid (CH₃COOH)

60.05 g/mol

NaOH

Sodium Hydroxide (NaOH)

40 g/mol

HCl

Hydrochloric Acid (HCl)

36.46 g/mol

H₂SO₄

Sulfuric Acid (H₂SO₄)

98.08 g/mol

NH₃

Ammonia (NH₃)

17.03 g/mol

CO₂

Carbon Dioxide (CO₂)

44.01 g/mol

KCl

Potassium Chloride (KCl)

74.55 g/mol

CaCl₂

Calcium Chloride (CaCl₂)

110.98 g/mol

Molarity Formulas & Concepts

Basic Formulas

M = n / V

Molarity = Moles ÷ Volume (in L)

n = mass / MW

Moles = Mass ÷ Molecular Weight

M₁V₁ = M₂V₂

Dilution equation

Concentration Units

Molarity (M): mol solute / L solution

Normality (N): equivalents / L solution

Molality (m): mol solute / kg solvent

% by weight: (mass solute / mass solution) × 100

Key Concepts

• Molarity depends on temperature (volume changes with temperature)

• Molality is temperature-independent (based on mass, not volume)

• For dilute aqueous solutions, molarity ≈ molality

• Always use the total solution volume, not just solvent volume

• Normality equals molarity for monovalent compounds