Percent Concentration to Molarity Calculator

Calcolatore da concentrazione % a molarità (e viceversa)

Seleziona il tipo di percentuale e inserisci la massa molare Mₙ (g/mol).
Per % m/m serve la densità della soluzione ρ (kg/L); per % v/v la densità del soluto ρ (g/mL).

Impostazioni
A) Da concentrazione % a molarità
B) Da molarità a concentrazione %
Nota: per soluzioni acquose diluite spesso ρsoluzione ≈ 1,00 kg/L. Per soluti liquidi (% V/V) la densità del soluto è necessaria per passare da mL a grammi.

The Concentration Converter by UtileApp allows you to quickly and accurately convert concentrations between percentage (% units) and molarity (mol/L). It supports the three most common percentage formats used in chemistry:

  • % m/V (w/v): grams of solute per 100 mL of solution.
  • % m/m (w/w): grams of solute per 100 g of solution (requires solution density).
  • % V/V (v/v): milliliters of solute per 100 mL of solution (requires solute density).

Main features

  • % → Molarity (M) conversion: automatically calculates g/L and converts using the molar mass (Mᵣ).
  • Molarity (M) → % conversion: provides results in % m/V, % m/m, or % V/V based on the selected format.
  • Precise density handling:
    • ρ<sub>solution</sub> (kg/L)
    • ρ<sub>solute</sub> (g/mL)
  • Customizable precision and clear step-by-step intermediate results.

Use and benefits

Ideal for laboratories, students, chemists, and environmental analysts, this tool helps avoid conversion errors between units and definitions of percentage, making solution preparation and verification straightforward and reliable.

Examples

  • 5% m/V → 5 g in 100 mL → 50 g/L → with Mᵣ = 58.44 → M ≈ 0.855 mol/L
  • 0.25 mol/L with Mᵣ = 60.05 → 15.01 g/L → % m/V ≈ 1.50%

Notes

  • For dilute aqueous solutions, you can assume ρ<sub>solution</sub> ≈ 1.00 kg/L.
  • For % V/V conversions, the density of the solute is required to convert milliliters to grams accurately.