🧪 Mole Ratio Calculator
Use the mole ratio from a balanced chemical equation to convert moles of one substance (A) into moles of another substance (B) in the same reaction.
What a mole ratio is
In a balanced chemical equation, the coefficients in front of each substance tell you the ratio in which moles of reactants combine and moles of products form. This ratio, called the mole ratio, is the basis of stoichiometry calculations.
The formula used
For a balanced equation containing substance A with coefficient a and substance B with coefficient b, the mole ratio of B to A is b:a. Given a known number of moles of A, the moles of B are found using moles of B = moles of A × (b / a).
- Enter the moles of the substance you already know (A).
- Enter the coefficients of A and B exactly as they appear in the balanced equation.
- The calculator returns the equivalent moles of substance B.
This calculator assumes the chemical equation you are working from is already correctly balanced, since mole ratios are only valid for a balanced equation. It is intended for general chemistry education purposes.