PPM to Molarity Calculator – Accurate & Easy Chemistry Tool

PPM ⇄ Molarity Calculator

Convert between ppm/ppb and molarity using molar mass for dilute aqueous solutions.

Inputs

Conversion direction

Assumes dilute aqueous solution: 1 ppm ≈ 1 mg/L.

Concentration

Molarity

Molar mass

Results

ppm

—

ppb

—

mg/L

—

μM

—

Step-by-step derivation

Enter values and click Calculate.

References

For dilute aqueous solutions, 1 ppm ≈ 1 mg/L and 1 ppb ≈ 0.001 mg/L.
M = c / (1000 × M_w) where c is in mg/L and M_w is in g/mol.
Inverse: c = M × M_w × 1000 in mg/L.

More of our calculators...

Atom Calculator

Atom Calculator helps you work out protons, neutrons, electrons, atomic number, mass number, or total atoms from chemistry values.

Theoretical Yield Calculator

Theoretical Yield Calculator to find the maximum product yield from stoichiometry, limiting reagent, and molar relationships.

pH Calculator

Free pH calculator that syncs [H+], [OH−], pOH, concentration, and mass/volume. Supports strong/weak acids and bases, unit options, steps, and PDF.

Percent Yield Calculator

Calculate percent yield from actual and theoretical yields. Real-time updates, unit options, step-by-step derivation, and PDF export. Free online tool.

Molarity Calculator

Calculate molarity fast from mass, volume, molar mass, and mass concentration. Live updates, unit conversions, and PDF export. Free online by Ajax Calculator.

Half-Life Calculator

Calculate half-life, decay constant, mean lifetime & remaining quantity with unit-aware inputs. Live results and PDF export on Ajax Calculator.

Avogadro’s number calculator

Calculate moles, particles, mass and molar mass using Avogadro’s constant. Real-time results with unit selectors and PDF export; mobile-friendly.