Theoretical Yield Calculator

Compute theoretical yield (g) from moles of limiting reactant, stoichiometric ratio, and product molar mass.

Inputs

Result

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How to use this calculator

  • Find the limiting reactant (use the limiting-reactant calculator).
  • Plug in moles, ratio, and product molar mass.
  • Read theoretical grams.

About this calculator

Theoretical yield is the maximum product you could get if the reaction went to completion with no losses. Find the limiting reactant first (the one that runs out first), apply the stoichiometric ratio from the balanced equation, then convert moles → grams via molar mass.

Frequently asked

How do I find the stoichiometric ratio?+
From the balanced equation. e.g., 2 H₂ + O₂ → 2 H₂O, so the H₂O:H₂ ratio is 2:2 = 1:1.
What if I have multiple products?+
Compute each separately. Each has its own ratio relative to the limiting reactant.
Theoretical yield in moles?+
Just skip the molar-mass conversion: result is moles_limiting × ratio.
How does this differ from actual yield?+
Theoretical = ideal max. Actual = what you measured. Their ratio × 100 = percent yield.
Does this account for incomplete reactions?+
No — it's the upper bound. Real reactions get less because of side products, losses, and equilibrium limits.

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