Percentage Calculator

Use this free percentage calculator to calculate percent of a number, percentage increase, percentage decrease, and percent difference. Calculate percent of a number, percentage increase, percentage decrease, percentage change, and percent difference.

Privacy note: For normal use, the interactive workflow is designed to run in your browser and keep the task fast without account friction.

How to use this tool

  1. Choose the percentage calculation: Use percent of a number, what percent is X of Y, percentage change, percentage increase, percentage decrease, or percent difference.
  2. Enter the values: Add the percentage and number, part and whole, or original and new values depending on the calculation.
  3. Review the instant result: Use the result for discounts, grades, finance, sales, tax estimates, tips, or other everyday percentage math.

About this tool

Use this free percentage calculator to calculate percent of a number, what percent one number is of another, percentage increase, percentage decrease, percentage change, and percent difference. This page targets high-intent percentage tasks such as percentage calculator, percent calculator, percentage increase calculator, percentage decrease calculator, percent difference calculator, percentage change calculator, what percent is X of Y, and what is X percent of Y. It is useful for discounts, tips, sales tax, grades, price changes, business metrics, finance, savings, commissions, markups, markdowns, and everyday math. Percentage formulas are simple: percent of a number equals percent divided by 100 multiplied by the number; percentage increase equals new value minus original value divided by original value multiplied by 100; percentage decrease equals original value minus new value divided by original value multiplied by 100.

FAQ

What is a percentage calculator?

A percentage calculator is an online tool that helps calculate percent of a number, what percent one number is of another, percentage increase, percentage decrease, percentage change, and percent difference.

How do I calculate a percentage of a number?

To calculate a percentage of a number, divide the percentage by 100 and multiply by the number. For example, 20% of 150 is 0.20 multiplied by 150, which equals 30.

How do I calculate percentage increase?

Subtract the original value from the new value, divide by the original value, then multiply by 100. For example, an increase from 50 to 60 is ((60 - 50) / 50) x 100 = 20%.

How do I calculate percentage decrease?

Subtract the new value from the original value, divide by the original value, then multiply by 100. For example, a decrease from 80 to 60 is ((80 - 60) / 80) x 100 = 25%.

What is percent difference?

Percent difference compares two values by dividing their absolute difference by their average, then multiplying by 100. It is useful when neither value is clearly the original value.

Can I use this for discounts and sales tax?

Yes. You can use the percent of a number calculator for discounts, tips, tax estimates, commissions, markdowns, and quick shopping calculations.