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## Calculating Percent Change in Excel

Microsoft Excel, a widely used spreadsheet application, serves various mathematical calculations, among which calculating percentage change stands out. Percentage change proves pivotal in discerning trends within data. For instance, companies often monitor the percentage change in sales to gauge fluctuations over time.

#### Explaining Percentage Change

Percentage change denotes a method of articulating the shift in a given variable. This variable could encompass measurable aspects like length, weight, or time. The formula for percentage change is:

(New Value - Old Value) / Old Value

For instance, let's consider tracking the weight of a horse over time. If the initial weight is 1000 pounds and after a month it becomes 1200 pounds, the percentage change in weight would be:

(1200 - 1000) / 10000.2 or 20%

This indicates a 20% increase in the horse's weight within a month. Conversely, if the weight decreased, the percentage change would be negative. For instance, if the weight after a month dropped to 800 pounds, the percentage change would be:

(800 - 1000) / 1000-0.2 or -20%

This reflects a 20% reduction in the horse's weight within a month.

#### Purpose of Using Percentage Change

Percentage change is instrumental in comparing two values to determine their directional trend—whether they're growing, declining, or static. For example, tracking sales or assessing stock value fluctuations leverages percentage change to inform decision-making.

#### Excel Guide on Calculating Percentage Change

Deriving percentage change in Excel involves creating a two-column table. The first column houses old values while the second column contains new values. Consider the following values:

Old ValueNew Value1020100200

In a third column, calculate the percentage change using the formula:

(New Value - Old Value) / Old Value

For the initial row, the formula would be:

(20 - 10) / 100.1 or 10%

For the subsequent row:

(200 - 100) / 1001 or 100%

The sign of the percentage change reveals whether the new value is higher or lower than the old value.

#### Utilizing Percentage Change

Once the percentage change is computed, it facilitates trend identification. For instance, observing positive percentage change in sales from month to month indicates growth, while negative change signifies decline. A 0% change implies stability in sales.

Additionally, percentage change enables the comparison of different variables. You might assess sales changes alongside stock market fluctuations. Differing trends might influence investment decisions—increasing sales amid a declining market could suggest a good investment in the company.

#### In Conclusion

Percentage change emerges as an indispensable tool for comparing values, easily computed in Excel. Tracking percentage change enables informed decisions regarding investment strategies.