Concentration Converter Calculator
Convert between common concentration units including molarity (mol/L), mass percent (w/w%), parts per million (ppm), parts per billion (ppb), and milligrams per liter (mg/L). Accounts for molecular weight and solution density for accurate conversions.
Concentration is a measure of how much solute is dissolved in a given amount of solution. Different fields of chemistry, environmental science, and industry use different concentration units depending on the application and the magnitude of the values involved.
Common Concentration Units:
- Molarity (M): Moles of solute per liter of solution. Most common in academic chemistry and stoichiometric calculations.
- Mass Percent (w/w%): Mass of solute divided by total mass of solution, times 100. Used in industrial chemistry and product labeling.
- Parts per Million (ppm): Equivalent to mg/kg for solids or approximately mg/L for dilute aqueous solutions. Common in environmental chemistry and water quality.
- Parts per Billion (ppb): One thousand times more sensitive than ppm. Used for trace contaminants.
- mg/L: Mass of solute per liter of solution. In dilute aqueous solutions, numerically equal to ppm.
Key Conversion Relationships:
Molarity to mass percent: mass% = (M x MW) / (density x 10). Mass percent to ppm: ppm = mass% x 10,000. For dilute aqueous solutions where density is approximately 1 g/mL, ppm and mg/L are numerically equivalent. When solution density differs significantly from 1, corrections are important for accurate conversions.