Percentage Calculator

Utilities

Calculate percentages & changes

The Percentage Calculator handles the three most common percentage calculations people need: finding what a percentage of a number is, determining what percentage one number is of another, and calculating the percentage change between two values.

These calculations come up constantly in daily life. Working out a 20% tip at a restaurant, figuring out how much you save with a 30% off coupon, calculating the percentage increase in your rent, or determining what portion of a budget has been spent are all quick tasks with this tool.

Enter your numbers and the result updates in real time. No need to remember the formula or reach for a calculator app. The tool covers the math patterns that handle the vast majority of real-world percentage questions.

How to Use

  1. Choose which type of percentage calculation you need.
  2. For "What is X% of Y": enter the percentage and the number to get the result.
  3. For "X is what % of Y": enter both numbers to find the percentage relationship.
  4. For "Percentage change from X to Y": enter the original and new values to see the increase or decrease.
  5. Results update instantly as you enter or change numbers.

Features

Frequently Asked Questions

How do I calculate a tip?

Use the "What is X% of Y" mode. Enter 15 or 20 as the percentage and your bill total as the number. The result is your tip amount.

How do I find the sale price after a discount?

Use "What is X% of Y" with the discount percentage and original price. Then subtract the result from the original price to get the sale price.

What is the difference between percentage change and percentage of?

Percentage of finds a portion of a number (e.g., 25% of 80 = 20). Percentage change measures how much a value increased or decreased between two points (e.g., from 80 to 100 = 25% increase).

Can percentage change be negative?

Yes. A negative percentage change indicates a decrease. For example, going from 100 to 75 represents a -25% change.