Molarity Calculator

Calculate molarity, moles, or volume - or solve dilution problems using C₁V₁ = C₂V₂.

Solve For

Molarity (mol/L)

Moles of solute (mol)

Volume of solution (L)

1 L = 1000 mL

Dilution: C₁V₁ = C₂V₂

Enter any three values to find the fourth.

Initial Solution

C₁ - Initial Concentration (mol/L)

V₁ - Initial Volume (L)

Final Solution

C₂ - Final Concentration (mol/L)

V₂ - Final Volume (L)

Formula Reference

Molarity

M = n / V

n = M × V

V = n / M

M in mol/L, V in Liters

Dilution

C₁V₁ = C₂V₂

Moles of solute are conserved when diluting.

Quick Examples

Molarity

Dilution

Volume Unit Conversions

1 L1000 mL

100 mL0.1 L

50 mL0.05 L

1 mL0.001 L

Always convert mL to L before entering values.

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Frequently Asked Questions

What is molarity?

Molarity (M) is a measure of concentration defined as the number of moles of solute dissolved in one liter of solution. For example, a 2 M NaCl solution contains 2 moles of NaCl per liter.

What is the dilution equation?

C₁V₁ = C₂V₂ expresses conservation of moles during dilution. If you take a volume V₁ of a concentrated solution C₁ and add solvent to reach volume V₂, the new concentration C₂ is lower.

What's the difference between molarity and molality?

Molarity (M) uses volume of solution in liters. Molality (m) uses mass of solvent in kilograms. Molarity changes with temperature (as volume changes); molality does not, making it preferable in thermodynamic calculations.

How do I convert grams to moles?

Moles = mass (g) ÷ molar mass (g/mol). Use the Molar Mass Calculator on this site to find the molar mass from the chemical formula, then divide the mass you have by that value.