Stoichiometry
Chemical Equation Balancer
Balance any chemical equation automatically and see the coefficients and atom counts on each side.
Atoms of each element must match on both …
Also called balance chemical equation · equation balancer
Science · 8 calculators
Stoichiometry Calculators
Balance chemical equations, mole ratios, limiting reactants, theoretical and percent yield, mass-mole conversions.
Stoichiometry
Mole Ratio Calculator
Mole ratio between any two species in a balanced equation, and the moles produced from a given amount.
ratio = coefficient of product ÷ coeffici…
Also called stoichiometric ratio · molar ratio
Stoichiometry
Stoichiometry Calculator
Balance a reaction and convert a mass of one reactant into the mass of every other species.
moles = mass / M
Also called reaction stoichiometry · mass to mass stoichiometry
Stoichiometry
Limiting Reactant Calculator
Find which reactant runs out first, how much product forms and how much of the excess is left over.
The reactant with the smallest moles ÷ co…
Also called limiting reagent · excess reactant
Stoichiometry
Theoretical Yield Calculator
Maximum product mass a reaction can give from the limiting reactant, plus the yield at a chosen efficiency.
theoretical yield = moles of limiting rea…
Also called maximum yield · expected yield
Stoichiometry
Percent Yield Calculator
Percent yield from actual and theoretical yield, or the actual yield from a target percentage.
% yield = actual yield ÷ theoretical yiel…
Also called reaction yield · actual yield calculator
Stoichiometry
Moles to Grams Calculator
Convert moles of a compound into grams using its molar mass.
m = n × M
Also called moles to grams · mol to g
Stoichiometry
Grams to Moles Calculator
Convert a mass in grams into moles using the compound’s molar mass.
n = m / M
Also called grams to moles · g to mol
Key stoichiometry formulas
| Chemical Equation Balancer | Atoms of each element must match on both sides |
|---|---|
| Mole Ratio | ratio = coefficient of product ÷ coefficient of reactant |
| Stoichiometry | moles = mass / M · scale by the coefficient ratio |
| Limiting Reactant | The reactant with the smallest moles ÷ coefficient limits the reaction |
| Theoretical Yield | theoretical yield = moles of limiting reactant × mole ratio × product molar mass |
| Percent Yield | % yield = actual yield ÷ theoretical yield × 100 |
| Moles to Grams | m = n × M |
| Grams to Moles | n = m / M |
Stoichiometry questions
What if my equation cannot be balanced?
Check that every element on the left also appears on the right. Reactions that need an extra species (like water or H⁺) cannot balance until you add it.