Percentage Calculator
Three quick percentage tools in one place: find X% of Y, find what percent one number is of another, or calculate the percent increase or decrease between two values. Results update as you type, and your numbers never leave this page.
Calculate percentages
Estimates only. This tool provides estimates for general calculation purposes.
Want more percent change tools? Try our Percent Change Calculator for finding new and original values.
How each mode works
X% of Y. Multiply Y by X/100. For example, 20% of 150 = (20/100) x 150 = 30.
X is what % of Y. Divide X by Y, then multiply by 100. For example, 30 is (30/150) x 100 = 20% of 150.
Percent increase or decrease. ((new value - old value) / |old value|) x 100. For example, going from 80 to 100 is ((100 - 80) / 80) x 100 = +25%.
Common questions
What is a percentage?
A percentage is a way of expressing a number as a fraction of 100. 20% means 20 out of every 100, or 0.20 as a decimal. Percentages make comparisons easy: instead of juggling raw numbers, you compare everything on the same 0-to-100 scale.
What is the difference between a percent and a percentage point?
A percentage point is the plain difference between two percentages, while a percent describes the relative change. If your savings rate goes from 10% to 15%, that is a 5 percentage point increase, but a 50% percent increase relative to the starting 10%.
What are percentages commonly used for?
Discounts and sales tax, tips at restaurants, interest rates and loan payments, tax rates, test scores and grades, commission calculations, and tracking growth or shrinkage in anything from revenue to weight. If it is a part of a whole, a percentage probably describes it.
How do I calculate a percent increase or decrease?
Subtract the old value from the new value, divide by the absolute value of the old value, and multiply by 100. Our Percent Change Calculator walks through it with three modes, including working backward to the original value.
Free to use, no sign up, and nothing leaves your browser. Your numbers are calculated locally on this page.