Percentage Calculator – Ultimate Guide to Percentages

Use this percentage calculator to solve one of the problems below.

How to Calculate Percentage

A percentage is the proportion of a part to the whole amount or the portion of a value. It can be expressed as a fraction/decimal or as a whole number with a percent symbol.

To solve the percentage between two values or one of the values themselves, use the percentage formula:

y = x × p100

Simply put, the value y is equal to value x multiplied by the percentage p, divided by 100.

By rewriting this formula, it’s possible to solve any of the values if the other two are known.

How to Calculate Percent of Change

To find the amount of change between two numbers expressed as a percent, use the percent change formula:

p = y – x|x| × 100

Thus, the percent of change p is equal to the final value y minus the initial value x, divided by the absolute value of the initial value x, times 100;

You can also easily find the amount of change from one value to another with our percent change calculator.

How to Calculate Percent Increase or Decrease

When increasing by a percentage, find the result using the percent increase formula:

y = x + (x × p100)

So when increasing the value x by percentage p, the result will be x plus x times the percent p, divided by 100.

When decreasing by a percentage, find the result using the percent decrease formula:

y = x – (x × p100)

So when decreasing the value x by percentage p, the result will be x minus x times the percent p, divided by 100.

Our percent increase and percent decrease calculators make it easy to solve these equations.

How to Convert Percentage to a Decimal

Percentages are often represented as a whole number with the “%” symbol after it, but they can also be expressed as a decimal. Since percent means “per 100,” the decimal conversion is just a division by 100.

See the percentage to decimal conversion formula:

decimal = percentage100

For convenience, we also have a percent to decimal conversion calculator.