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Home / Tips and Tricks / Excel percentage formulas: percentage of the total, percentage increase or decrease, sales tax and more

# Excel percentage formulas: percentage of the total, percentage increase or decrease, sales tax and more Excel percentage formulas can help you every day through major and minor problems – from determining sales tax (and gratuities) to calculating increases and decreases. We will go through some examples below: convert fractions into percentages; deduct sales tax from totals; percentage of total; percentage increase or decrease; percentage of completion; and percentage ranking (percentile).

## Convert fractions to percentages

Percentages are a portion (or fraction) of 100. The math to determine a percentage is dividing the numerator (the number on top of the fraction) by the denominator (the number at the bottom of the fraction), then multiply the answer by 1

00. For example, the fraction 6/12 breaks into a decimal such as this: 6 divided by 12 (which equals 0.5) times 100 is 50 percent.  In Excel, you do not need a formula to convert a fraction into a percentage – only a change in the format. For example:

1. Enter 10 fractions in column A (from A2 to A11). (Note: Excel automatically reduces fractions to their lowest terms, such as changing from 6/10 to 3/5.)

Because the Excel standard is decimal, you must mark the range and format it for Fractions. This is how:

2. Copy the fractions in column A to Column B.

3. Highlight that range and go to the Home tab . Select Percentage from the drop-down list in the field Number formats .