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Stoichiometry Calculators

Mole Ratio Calculator

Mole ratio between any two species in a balanced equation, and the moles produced from a given amount.

Enter values

Results update as you type.

Result

Mole ratio

2 H2 : 2 H2O

Ratio as a number
1
Moles of H2O
4 mol
Mass of H2O
72.06 g
Balanced equation
2H2 + O2 → 2H2O

About the Mole Ratio Calculator

Mole ratio between any two species in a balanced equation, and the moles produced from a given amount.

Also known as: stoichiometric ratio, molar ratio, coefficient ratio.

How to use this calculator

  1. Enter chemical equation, from compound, to compound, moles available.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

ratio = coefficient of product ÷ coefficient of reactant

Worked example

Using the values pre-filled in the calculator above:

  • Chemical equation: 2H2 + O2 -> 2H2O
  • From compound: H2
  • To compound: H2O
  • Moles available = 4 mol

the calculator returns:

  • Mole ratio: 2 H2 : 2 H2O
  • Ratio as a number: 1
  • Moles of H2O: 4 mol
  • Mass of H2O: 72.06 g