How do I calculate a percentage of a number?

Multiply the number by the percentage, then divide by 100. For example, 20% of 50 = (20 × 50) / 100 = 10.

How do I calculate percent increase or decrease?

Subtract the original value from the new value, divide by the original value, then multiply by 100. A positive result is a percent increase; a negative result is a percent decrease.

Unit.tech

Percentage Calculator

Three common percentage questions, answered instantly as you type.

What is X% of Y?

Percent

of number

X is what percent of Y?

Number

is what % of

Percent change from X to Y

From

Formulas

X% of Y = (X × Y) / 100
X is what % of Y = (X / Y) × 100
% change from X to Y = ((Y − X) / X) × 100