Percentage Calculator

What is X% of Y?

Find a percentage of a given number. For example: what is 15% of 200?

What is % of = ?

X is what percent of Y?

Find what percentage one number is of another. For example: 30 is what percent of 150?

is what % of = ?

Percentage Change Calculator

Calculate the percentage increase or decrease from one value to another.

From to = ?% change

Percentage Difference Calculator

Find the percentage difference between two values (order does not matter).

Value 1 Value 2 = ?% diff

Increase / Decrease a Number by a Percentage

Increase or decrease a number by a given percentage amount.

% = ?

Find the Original Number (Reverse Percentage)

If a value after a percentage change is known, find the original number. For example: 120 is 150% of what number?

is % of what number? = ?

A percentage is a dimensionless number expressed as a fraction of 100. The word comes from the Latin phrase “per centum,” meaning “by a hundred.” Percentages are used to express how large or small one quantity is relative to another.

What is X% of Y?

Multiply the percentage (as a decimal) by the total value.

Result = (X / 100) x Y
Example: What is 20% of 150? = (20 / 100) x 150 = 30

X is what percent of Y?

Divide the part by the whole, then multiply by 100.

Percentage = (X / Y) x 100
Example: 30 is what percent of 150? = (30 / 150) x 100 = 20%

Percentage change:

Measures the relative change between an old and a new value.

Percentage Change = ((New Value – Old Value) / |Old Value|) x 100
A positive result is an increase; a negative result is a decrease.

Percentage difference:

Measures the difference between two values relative to their average. Unlike percentage change, it is symmetric (order does not matter).

Percentage Difference = (|V1 – V2| / ((V1 + V2) / 2)) x 100

Reverse percentage:

Used when you know the result of a percentage operation and need to find the original value.

Original = Result / (Percentage / 100)
Example: 120 is 150% of what? = 120 / (150 / 100) = 80