PPM to Molarity Calculator

Calcolatore da PPM a Molarità (e viceversa)

Scegli la definizione di ppm e inserisci la massa molare Mᵣ (g/mol). Per ppm (mg/kg) indica anche la densità ρ (kg/L) per convertire in mg/L.

Impostazioni
A) Da ppm a molarità
Passi: ppm → mg/L (o ppm·ρ se ppm = mg/kg) → g/L → M = (g/L)/Mᵣ.
B) Da molarità a ppm
Passi: g/L = M·Mᵣ → mg/L = g/L·1000 → se vuoi ppm (mg/kg) usa ppm = (mg/L)/ρ.
Note: per soluzioni diluite acquose, 1 ppm ≈ 1 mg/L (ρ ≈ 1 kg/L). In matrici non acquose o ad alta concentrazione, specifica la densità.

The PPM ⇄ Molarity Converter by UtileApp lets you instantly convert between concentration units — from PPM (parts per million) to molarity (mol/L) and vice versa.
It supports both ppm as mg/L (aqueous solutions) and ppm as mg/kg (w/w), with the option to include density (ρ, kg/L) when needed.

What it does

🔹 PPM → Molarity M=mg/L1000⋅MrM = frac{text{mg/L}}{1000 cdot M_r}M=1000⋅Mr​mg/L​

🔹 Molarity → PPM mg/L=M⋅Mr⋅1000text{mg/L} = M cdot M_r cdot 1000mg/L=M⋅Mr​⋅1000

🔹 mg/kg ⇄ mg/L conversion mg/L=ppm⋅ρtext{mg/L} = text{ppm} cdot rhomg/L=ppm⋅ρ

(where ρ is the density of the solution in kg/L)

Why it’s useful

  • Perfect for environmental, water, food, and laboratory analyses
  • Handles unit conversions and intermediate steps (g/L, mg/L) with precision
  • Provides clear, immediate results in consistent units

Quick examples

💧 100 ppm (mg/L) of NaCl, M<sub>r</sub> = 58.44 → M ≈ 0.00171 mol/L
💧 0.002 mol/L with M<sub>r</sub> = 60.05 → ppm ≈ 120.1 mg/L

Notes

For dilute aqueous solutions, you can often assume 1 ppm ≈ 1 mg/L (ρ ≈ 1 kg/L).
For non-aqueous matrices, specify the density for accurate results.

A precise and practical tool for scientists, analysts, and students working with concentration conversions in chemistry and environmental sciences.