PPM to Molarity Calculator

PPM to Molarity Calculator

Enter your solution’s concentration in PPM. Input molecular weight of your substance in g/mol or select from common compounds. Specify the solution density (default is 1.000 g/mL for dilute aqueous solutions). The calculator will convert PPM to molarity (M) and provide millimolar (mM) and micromolar (μM) values.

  • Inputs: PPM = 100, MW = 58.44 g/mol (NaCl), Density = 1.000 g/mL
  • Process: Enter values or select NaCl from dropdown
  • Result: 0.00171 M (1.71 mM)

PPM to Molarity Conversion Chart

ExampleSubstanceConcentration (ppm)Molar Mass (g/mol)CalculationMolarity (mol/L)
Sodium Chloride (NaCl)NaCl500 ppm58.44 g/mol(500 / (58.44 × 1000)) = 0.00856 mol/L0.00856 mol/L
Calcium Carbonate (CaCO₃)CaCO₃2000 ppm100.09 g/mol(2000 / (100.09 × 1000)) = 0.01998 mol/L0.01998 mol/L
Glucose (C₆H₁₂O₆)C₆H₁₂O₆10000 ppm180.16 g/mol(10000 / (180.16 × 1000)) = 0.0555 mol/L0.0555 mol/L
Nitrate Ion (NO₃⁻)NO₃⁻50 ppm62.00 g/mol(50 / (62.00 × 1000)) = 0.000806 mol/L0.000806 mol/L
Sulfate Ion (SO₄²⁻)SO₄²⁻100 ppm96.06 g/mol(100 / (96.06 × 1000)) = 0.001041 mol/L0.001041 mol/L

How to Convert PPM to Molarity

To convert a solution’s concentration from PPM to molarity, multiply the PPM value by solution density, then divide by the molecular weight times 1000. This converts mass concentration (mg/L) to molar concentration (mol/L). Account for solution density variations in concentrated solutions.

  • Inputs: 1000 PPM sulfuric acid solution (H₂SO4)
  • Calculations: (1000 × 1.000) ÷ (98.08 × 1000) = 0.0102
  • Result: 0.0102 M H₂SO4

PPM to Molarity Conversion Formula

Molarity = (PPM × Density) ÷ (Molecular Weight × 1000)

Where:
PPM = Parts per million
Density = Solution density in g/mL
MW = Molecular weight in g/mol
1000 = Conversion factor for mg/L

Sodium Chloride Solution

  • Inputs: 500 PPM NaCl, MW = 58.44 g/mol
  • Calculations: (500 × 1.000) ÷ (58.44 × 1000)
  • Result: 0.00856 M

Potassium Chloride Solution

  • Inputs: 750 PPM KCl, MW = 74.55 g/mol
  • Calculations: (750 × 1.000) ÷ (74.55 × 1000)
  • Result: 0.01006 M

Sodium Hydroxide Solution

  • Inputs: 200 PPM NaOH, MW = 40.00 g/mol
  • Calculations: (200 × 1.000) ÷ (40.00 × 1000)
  • Result: 0.00500 M

Sulfuric Acid Solution

  • Inputs: 2000 PPM H₂SO4, MW = 98.08 g/mol
  • Calculations: (2000 × 1.000) ÷ (98.08 × 1000)
  • Result: 0.02040 M

Trace Metal Solution

  • Inputs: 50 PPM Cu²⁺, MW = 63.55 g/mol
  • Calculations: (50 × 1.000) ÷ (63.55 × 1000)
  • Result: 0.00079 M

What is Parts Per Million and Molarity?

Parts per million (PPM) measures mass concentration as milligrams of solute per liter of solution, while Molarity (M) expresses concentration as moles of solute per liter of solution. Converting between these units requires the substance’s molecular weight and solution density.

PPM = mg solute/L solution
Molarity = mol solute/L solution

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