Molarity / Concentration Calculator

All fields sync. Unit changes convert only that field. No backfilling while you type.

Inputs

Mass

Molecular Weight

Volume

Concentration (mass/volume)

Molarity

Actions

Step-by-Step Derivation

Start by entering any two or more of: mass, molecular weight, volume, concentration, or molarity. The rest will update automatically.

M = n / V, with n = m / M_r ⇒ M = m / (M_r · V)
c = m / V (mass concentration, e.g., g/L)
M = c / M_r and m = c · V

References

IUPAC Gold Book: amount concentration (molarity) definition.
General chemistry texts (e.g., Atkins’ Physical Chemistry): M = n/V, n = m/M_r, c = m/V.

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