Percentage Calculator

Calculate percentages, ratios, and percent change instantly

percent % of number is

part is what % of total =

before changes to after =

base percent % =

How to Use the Percentage Calculator

The Internet Octopus Percentage Calculator supports three common percentage calculations. Enter numbers in the fields and the result updates instantly.

What is X% of Y?

Enter a percentage and a number to find the result. For example, 15% of 200 = 30.

X is what percent of Y?

Find what percentage one number is of another. For example, 30 is 15% of 200.

Percent change from X to Y

Calculate the percentage increase or decrease between two values. For example, from 80 to 100 is a 25% increase.

Value after X% increase or decrease

Enter a base value and a percentage, then choose increase or decrease to find the new value. Example: 100 after 20% increase = 120, after 20% decrease = 80.