Percent Concentration to Molarity Calculator

Convert a % w/w concentration to molarity.

Molarity (mol/L) 12.076

Formula: M = (10 × % × density) ÷ molar mass

Step-by-step with your numbers:

1. Values used:

2. Concentration = 37 % w/w

3. Density = 1.19 g/mL

4. Molar mass = 36.46 g/mol

6. Molarity = 12.076mol/L

Did we solve your problem today?

Convert a weight-percent solution (with its density) into molarity.

The math behind it

molarity = (10 × % w/w × density g/mL) ÷ molar mass.

37% HCl, density 1.19, M 36.46 → ~12.1 M.

Where's the 10?

It converts g/mL and % into g per litre.