Molarity Calculator

Calculate solution molarity (C = n/V), convert mass to moles, and solve dilution problems using C₁V₁ = C₂V₂.

Mode

Molarity (C) = moles of solute (n) / volume of solution (V)

Molarity
0.5 mol/L (M)
500 mmol/L = 500 mM

Results

QuantityValue
Moles (n)0.5 mol
Volume (V)1 Liters (L)
Molarity (C)0.5 M
Millimolar (mM)500 mM

Key Formulas

FormulaExpression
MolarityC = n / V
Molesn = mass / MW
DilutionC₁V₁ = C₂V₂
AvogadroN = n × 6.022×10²³

Calculate molarity, moles, or volume for chemistry solutions with our free molarity calculator, useful for lab work, coursework, and solution preparation.

How It Works

Molarity (M) = moles of solute ÷ liters of solution. This calculator can solve for molarity, moles, or volume given the other two values, and can also incorporate molar mass to convert between mass and moles.

How to Use This Calculator

  1. 1) Select what you want to calculate (molarity, moles, volume, or mass)
  2. 2) Enter the known values, including molar mass if working with mass
  3. 3) Click Calculate to see your result

Frequently Asked Questions

What's the difference between molarity and molality?

Molarity is moles of solute per liter of solution (volume-based); molality is moles of solute per kilogram of solvent (mass-based), molality doesn't change with temperature while molarity can, since volume expands with heat.

How do I prepare a solution of a specific molarity?

Calculate the required moles for your target molarity and volume, convert to mass using the solute's molar mass, then dissolve that mass in enough solvent to reach the target volume.

Does temperature affect molarity?

Yes, since molarity depends on solution volume, and volume can change slightly with temperature, molarity measurements are typically specified at a standard temperature.

What's the difference between concentrated and dilute solutions?

Concentrated solutions have a high molarity (more solute per volume); dilute solutions have a low molarity (less solute per volume).