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Water of Crystallization n from % Water Calculator

Find n in M·nH₂O from the % water and anhydrous molar mass.

Reverse-engineer the n in M·nH₂O from the percent water of hydration and the molar mass of the anhydrous compound: n = (% water · M_anhydrous) / (18.015 · (100 − % water)).

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

%
g/mol

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

n = (%_water · M_anh) / (18.015 · (100 − %_water))

In depth

Reverse-engineer the n in M·nH₂O from the percent water of hydration and the molar mass of the anhydrous compound: n = (% water · M_anhydrous) / (18.015 · (100 − % water)).