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Limiting Reagent Calculator (Two Reagents)

Compare moles ÷ stoichiometric coefficient.

Compare two reagents in a balanced reaction by their (moles ÷ coefficient) ratio to identify the limiting reagent and the moles of excess reagent left over after reaction.

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

Inputs

g
g/mol
g
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

Effective ratio_i = moles_i / coeff_i. Limiting = arg min. Excess = moles_other − (moles_lim · coeff_other / coeff_lim).

In depth

Compare two reagents in a balanced reaction by their (moles ÷ coefficient) ratio to identify the limiting reagent and the moles of excess reagent left over after reaction.