Limiting Reagent Calculator

Compare moles divided by balanced-equation coefficients to find the limiting reactant without pretending to balance the equation for you.

Enter amounts already converted to moles, or enter grams plus molar mass. Coefficients must come from a balanced chemical equation; this tool does not balance reactions.

—The smallest n/coefficient value limits reaction extent.

How to use this Limiting Reagent Calculator

Identify the limiting reactant from stoichiometric coefficients and available amounts. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.