For instance, let’s say a company’s net profit was $155,000 in Q2 of 2018, then increased to $182,000 in Q2 of 2019. To determine the year-over-year percentage change, subtract $182,000 by $155,000, which equals $27,000. Divide $27,000 by $155,000. Then multiply the resulting figure, which can be rounded to 0.1742, by 100. That number represents the year-over-year growth, or percentage change, in that company’s net profit.