Enter your Chemical Equation, select a Calculation Type, pick your known Compound and Amount, and choose which compound to solve for — the Stoichiometry Calculator returns the Calculated Amount, Molar Ratio, Mass Ratio, and Conversion Factor.
Calculated Amount
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Molar Ratio
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Mass Ratio
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Conversion Factor
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Stoichiometry is the calculation of quantities in chemical reactions based on the balanced chemical equation. It allows you to determine how much reactant is needed or how much product will be formed in a chemical reaction.
The calculator uses the coefficients from your balanced chemical equation to establish molar ratios between compounds. It then converts your input amount to moles, applies the ratio, and converts to your desired output unit.
Yes, the chemical equation must be balanced for accurate stoichiometric calculations. The calculator relies on the coefficients in the balanced equation to determine the correct molar ratios between reactants and products.
You can input and output amounts in moles, grams, molecules, or atoms. The calculator automatically handles unit conversions using molar masses and Avogadro's number (6.022 × 10²³).
Yes, you can calculate the amount of any compound in the equation whether it's a reactant or product. Simply specify whether you're given a reactant amount or product amount in the calculation type.
Use standard chemical notation with proper capitalization. For example: H2O for water, CO2 for carbon dioxide, NaCl for sodium chloride. Use numbers as subscripts and ensure formulas match those in your balanced equation.
A molar ratio is the ratio of moles of one substance to moles of another substance in a balanced chemical equation. It's derived from the coefficients and tells you the proportional relationship between compounds.
This calculator works best when you know the amount of one reactant or product. For limiting reactant problems, you would need to calculate with each reactant separately to determine which produces the least amount of product.