In chemistry, the theoretical yield is the maximum amount of product a chemical reaction could create based on chemical equationsIn reality, most reactions are not perfectly efficient If you perform the experiment, you'll end up with a smaller amount, the actual yieldTo express the efficiency of a reaction, you can calculate the percent yield using this formula %yield = (actual yieldFor example, if a stock trades for $100 per share today, and the company's annualized dividend is $5 per share, the dividend yield is 5% The formula is "annualized dividend divided by share pricePercent yield or percentage yield is the ratio of the actual yield and the theoretical yield of a chemical reaction The experimental yield is divided by the theoretical yield and multiplied by 100 to be calculated as the percent yield If the theoretical yield and the experimental yield are same then the percent yield will be 100% How To Calculate Percentage Yield Formula How To Wiki Yield formula chemi...