Percentage Calculator – Free Online Utility

Calculate percentages, percent change, and proportions.

1
What is X% of Y?

What is
%
of
Result:30

2
X is what percent of Y?

is what % of
Result:20%

3
Percentage increase or decrease?

From
to
Result:
20% INCREASE

What is a Percentage Calculator?

A percentage calculator is a simple tool designed to handle common math problems involving percentages. Whether you need to figure out a discount while shopping, calculate the tip at a restaurant, or determine the percent change in your business metrics, this tool does the math instantly.

Common Percentage Calculations

  • What is X% of Y? Used for finding a specific portion of a total. For example, calculating a 15% tip on a $40 restaurant bill (Result: $6).
  • X is what percent of Y? Used for determining the proportion of a whole. For example, if you scored 45 out of 60 on a test, you scored 75%.
  • Percentage increase or decrease: Used to measure how much a value has changed over time. For example, if a stock price goes from $100 to $120, that is a 20% increase.

How to Calculate Percentages Manually

To calculate a percentage manually, you can use the formula: (Part / Whole) * 100. For example, if you want to find out what percentage 15 is of 50, you divide 15 by 50 to get 0.3, then multiply by 100 to get 30%.

Frequently Asked Questions

Divide X by Y, and then multiply the result by 100. For example, to find out what percentage 20 is of 50: (20 / 50) × 100 = 40%.
Subtract the original value from the new value. Then divide that difference by the original value. Finally, multiply by 100. If the result is positive, it's an increase. If negative, it's a decrease.
Convert the percentage (X) to a decimal by dividing by 100, then multiply by Y. For example, 15% of 200 is: (15 / 100) × 200 = 30.
Yes. All calculations are performed directly in your browser. No data is sent to our servers.

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