Chemistry

Percent Yield Calculator

How efficient was your reaction?

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Percent yield
Percent yield
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Product not recovered (g)
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Percent Yield Calculator by TheCalcTools

How the Percent Yield Calculator works

Enter the mass of product you actually isolated and the maximum mass the stoichiometry predicts.

The percent yield is their ratio.

A yield above 100% usually means the product is impure or wet.

The formula

% yield = actual ÷ theoretical × 100

Worked example

Using the default values shown in the calculator:

Actual yield (g)8.2
Theoretical yield (g)10.5
  1. % yield = 8.2 ÷ 10.5 × 100 = 78.10%.
  2. Product not recovered: 2.30 g.

Result:

Percent yield78.10%
Product not recovered (g)2.300

Frequently asked questions

Why is the yield below 100%?

Reactions may not go to completion, side reactions occur and some product is lost during separation and purification.

How do I get the theoretical yield?

Use the limiting reagent and the balanced equation to find the maximum moles of product, then multiply by its molar mass.

Sources and further reading

Moles CalculatorConvert grams to moles and molecules Molarity CalculatorFind molarity and moles from a mass of solute dissolved in a volume Theoretical Yield CalculatorEnter the limiting reactant, the mole ratio and molar masses to get the maximum product… Limiting Reagent CalculatorEnter two reactants and the balanced equation coefficients to find which one runs out… Atom Economy Calculator (Green Chemistry)Enter the molar mass of the desired product and of all reactants to get the atom economy Titration CalculatorWork out an unknown concentration from a titration result

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