Concentration, calculated clearly.

PPM, or Parts Per Million, expresses a ratio on a one-million-part scale. The concentration basis must be stated because mass-based, volume-based, and other PPM expressions are not automatically interchangeable.

For a mass-based concentration, divide the solute mass by the total mixture mass and multiply by 1,000,000. The solute and total mixture must use compatible mass units.

For the same concentration basis, divide PPM by 10,000. For example, 100 PPM corresponds to 0.01%.

For a liquid, the exact mass-based conversion uses solution density: PPM = (mg/L) ÷ density in kg/L. For dilute water-like solutions, the numerical values are often approximately equal.

On the same concentration basis, 1 PPM equals 1,000 PPB because a billion-part scale is 1,000 times finer than a million-part scale.

For an ideal dilution where the concentration basis remains compatible, use C₁V₁ = C₂V₂. Enter the known concentration and volume values and solve for the unknown quantity.

They measure concentration on different bases. A conversion requires the PPM basis, solute molar mass, and solution density when converting a mass-based PPM value to molarity.

Yes for gas concentrations when the molecular weight, temperature, and pressure are defined. The relationship uses the ideal gas law, so the conditions are part of the calculation.

Both are dimensionless ratio scales when the basis is the same. PPM uses one part in one million, while PPB uses one part in one billion, so 1 PPM equals 1,000 PPB.

Use a calculator when you need a repeatable conversion, concentration, dilution, solution-preparation, or chemistry calculation and want the formula and assumptions shown alongside the result.