# Calculate percentages

Excel provides different ways to calculate percentages. For example, you can use Excel to calculate sales tax for purchases, the percentage of correct answers on a test, or the percentage of change between two values.

Use the provided sample data and the following procedures to learn how to calculate percentages.

Let's say that you answered 42 questions out of 50 correctly on a test. What is the percentage of correct answers?

1. Click any blank cell.
2. Type =42/50, and then press RETURN .

The result is 0.84.

1. Select the cell that contains the result from step 2.
2. On the Home tab, under Number, click Percentage .

The result is 84.00%, which is the percentage of correct answers on the test.

Note   To change the number of decimal places that appear in the result, click Increase Decimal  or Decrease Decimal .

Let's say that the sale price of a shirt is \$15, which is 25% off the original price. What is the original price? In this example, you want to find 75% of which number equals 15.

1. Click any blank cell.
2. Type =15/0.75, and then press RETURN .

The result is 20.

1. Select the cell that contains the result from step 2.
2. On the Home tab, under Number, click Currency

The result is \$20.00, which is the original price of the shirt.

Note   To change the number of decimal places that appear in the result, click Increase Decimal  or Decrease Decimal .

Let's say that want to purchase a computer for \$800 and must pay an additional 8.9% in sales tax. How much do you have to pay for the sales tax? In this example, you want to find 8.9% of 800.

1. Click any blank cell.
2. Type =800*0.089, and then press RETURN .

The result is 71.2.

1. Select the cell that contains the result from step 2.
2. On the Home tab, under Number, click Currency

The result is \$71.20, which is the sales tax amount for the computer.

Note   To change the number of decimal places that appear in the result, click Increase Decimal  or Decrease Decimal .

Let's say that your earnings are \$2,342 in November and \$2,500 in December. What is the percentage of change in your earnings between these two months? Then, if your earnings are \$2,425 in January, what is the percentage of change in your earnings between December and January? You can calculate the difference by subtracting your new earnings from your original earnings, and then dividing the result by your original earnings.

#### Calculate a percentage of increase

1. Click any blank cell.
2. Type =(2500-2342)/2342, and then press RETURN .

The result is 0.06746.

1. Select the cell that contains the result from step 2.
2. On the Home tab, under Number, click Percentage .

The result is 6.75%, which is the percentage of increase in earnings.

Note   To change the number of decimal places that appear in the result, click Increase Decimal  or Decrease Decimal .

#### Calculate a percentage of decrease

1. Click any blank cell.
2. Type =(2425-2500)/2500, and then press RETURN .

The result is -0.03000.

1. Select the cell that contains the result from step 2.
2. On the Home tab, under Number, click Percentage .

The result is -3.00%, which is the percentage of decrease in earnings.

Note   To change the number of decimal places that appear in the result, click Increase Decimal  or Decrease Decimal .

Let's say that you spend an average of \$113 on food each week, and you want to increase your weekly food expenditures by 25%. How much can you spend? Or, if you want to decrease your weekly food allowance of \$113 by 25%, what is your new weekly allowance?

#### Increase a number by a percentage

1. Click any blank cell.
2. Type =113*(1+0.25), and then press RETURN .

The result is 141.25.

1. Select the cell that contains the result from step 2.
2. On the Home tab, under Number, click Currency

The result is \$141.25, which is a 25% increase in weekly food expenditures.

Note   To change the number of decimal places that appear in the result, click Increase Decimal  or Decrease Decimal .

#### Decrease a number by a percentage

1. Click any blank cell.
2. Type =113*(1-0.25), and then press RETURN .

The result is 84.75.

1. Select the cell that contains the result from step 2.
2. On the Home tab, under Number, click Currency

The result is \$84.75, which is a 25% reduction in weekly food expenditures.

Note   To change the number of decimal places that appear in the result, click Increase Decimal  or Decrease Decimal .