How to Calculate Percentage Increase of a Stock Value

by C. Taylor

Offering a dollar value when describing a stock's increase in value is meaningless without a reference point. As an example, stating a stock increased by $10 offers no real insight into its growth, because you don't know its starting value. If the stock was originally $500, that $10 increase is no big deal, but if it was originally a dollar stock, then that growth is significant. A better way to describe growth is using percentages, which tells you the amount of growth relative to its initial value.

Step 1

Subtract the stock's original value from its current value. As an example, if you the stock was originally trading at $50 per share, and three weeks later it traded for $60 per share, you would calculate the difference of $10.

Step 2

Divide this difference by the original value. Continuing this example, dividing $10 by $50 gives you 0.20.

Step 3

Multiply by 100 to convert the figure into percentage format. In this example, this gives you a 20 percent increase.