Percent Yield Calculator

How to calculate percent yield

1. Type the actual yield in grams.
2. Type the theoretical yield, or work it out from the moles of limiting reagent, the moles of product per mole of it and the product formula.
3. The percent yield appears as you type.

Frequently asked questions

Can the percent yield be over 100%?

Only when the product is not pure, for example when it is still wet or contains a side product.

How is percent yield calculated?

Actual yield ÷ theoretical yield × 100. Getting 4.2 g when 5.0 g was possible is an 84% yield.

What is the theoretical yield?

The mass of product you would get if all of the limiting reagent reacted: its moles, times the moles of product per mole of it, times the product's molar mass.