What is the percent yield formula?

Percent yield equals the actual yield divided by the theoretical yield, multiplied by 100. The actual yield is what you measured; the theoretical yield is the maximum predicted by the balanced equation.

Can percent yield exceed 100 percent?

In theory no, but a value above 100 percent usually signals an impure or wet product, or a weighing or measurement error.

No. The calculation runs entirely in your browser and nothing is sent anywhere.

Percent Yield Calculator

Percent yield from actual and theoretical yield — or solve either.

Percent yield calculator

Percent yield tells you how efficient a chemical reaction was. It compares the actual yield you measured against the theoretical yield predicted by stoichiometry:

% yield = (actual yield ÷ theoretical yield) × 100

Choose whether you want the percent yield, the actual yield, or the theoretical yield, enter the two values you know, and the answer appears instantly — all in your browser.