Molarity Calculator

Calculate molarity, moles, volume, or mass using M = mol/L with step-by-step solutions

M = n / V

Molarity = Moles of Solute / Volume of Solution (in Liters)

Calculator

Solve For

Moles of Solute (n)

Volume of Solution (V)

Mass of Solute (m) - grams

Molar Mass (MM) - g/mol

Common Molar Masses

Click to use molar mass value

Common Solution Preparations

Saline (0.9% NaCl)

Molarity: 0.154 M

Solute: NaCl

Molar Mass: 58.44 g/mol

Per 1L: 9.00 g

1M HCl Stock

Molarity: 1 M

Solute: HCl

Molar Mass: 36.46 g/mol

Per 1L: 36.46 g

1M NaOH Stock

Molarity: 1 M

Solute: NaOH

Molar Mass: 40 g/mol

Per 1L: 40.00 g

10X PBS Buffer

Molarity: 1.37 M

Solute: NaCl

Molar Mass: 58.44 g/mol

Per 1L: 80.06 g

0.1M EDTA

Molarity: 0.1 M

Solute: EDTA

Molar Mass: 292.24 g/mol

Per 1L: 29.22 g

1M Glucose

Molarity: 1 M

Solute: C6H12O6

Molar Mass: 180.16 g/mol

Per 1L: 180.16 g

Understanding Molarity

Key Formulas

M = n / V

Molarity = Moles / Volume (L)

n = m / MM

Moles = Mass / Molar Mass

M = m / (MM x V)

Combined formula for mass

Quick Tips

1 M = 1 mol/L (one molar solution)
Always convert mL to L before calculating (divide by 1000)
Molar mass is found by adding atomic masses from periodic table
For dilutions, use M1V1 = M2V2