How do you calculate a percentage of a value?

Divide the percent by 100 and multiply by the value. For example, 20 percent of 60 is 0.20 times 60, which equals 12.

How do you calculate percentage change?

Subtract the starting value from the final value, divide by the starting value, then multiply by 100.

Math calculator

Percentage Calculator

Solve the common percentage questions people actually search for: percent of a number, one value as a percent of another, reverse percentage, percentage change, and percent conversion.

Percent of a value

What is X% of Y?

x / 100 * y

Percent % Value

Answer12

Percent ratio

X is what % of Y?

x / y * 100

Part Whole

Answer20%

Reverse percent

X is Y% of what?

x / (y / 100)

Part Percent %

Answer60

Percent change

Percentage change from start to final

(new - old) / old * 100

Start value Final value

Answer25% increase

Percent converter

Percent to decimal, fraction and ppm

p / 100

Percent %

Decimal0.125

Fraction1/8

PPM125000 ppm

Percentage calculation examples

Percentage of a value

20% of 60 = 20 / 100 x 60 = 12.

Percentage ratio

12 is what percent of 60? 12 / 60 x 100 = 20%.

Whole value

12 is 20% of what? 12 / 20 x 100 = 60.

Percentage change

From 40 to 50: (50 - 40) / 40 x 100 = 25% increase.

Percentage formulas

Question	Formula	Example
What is X% of Y?	X / 100 x Y	20 / 100 x 60 = 12
X is what % of Y?	X / Y x 100	12 / 60 x 100 = 20%
X is Y% of what?	X / (Y / 100)	12 / 0.20 = 60
Percentage change	(final - start) / start x 100	(50 - 40) / 40 x 100 = 25%

FAQ

How do I calculate 20% of a number?

Convert 20% to 0.20, then multiply by the number. For 60, the answer is 12.

What is the difference between percent increase and percent change?

Percent change is the general formula. If the final value is higher, it is an increase. If it is lower, it is a decrease.

Can I use negative numbers?

Yes. The calculator accepts negative values. Percentage change with a zero starting value is undefined.