Percentage Calculator | Free Online Percentage Tools

Calculate percentages, percentage changes, discounts, and more with our comprehensive percentage calculator

Select Calculation Type

What is X% of Y?

Formula: Result = (X ÷ 100) × Y

%

X is what percent of Y?

Formula: Percentage = (X ÷ Y) × 100

Percentage Increase

Formula: % Increase = [(New - Original) ÷ Original] × 100

Percentage Decrease

Formula: % Decrease = [(Original - New) ÷ Original] × 100

Percentage Difference

Formula: % Difference = |Value1 - Value2| ÷ [(Value1 + Value2) ÷ 2] × 100

Calculation Result

Percentage Calculation
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Enter values and click Calculate

Calculation Details

The result will appear here after calculation.

How to Use the Percentage Calculator

  1. Select Calculation Type: Choose from 5 different percentage calculations using the buttons on the left.
  2. Enter Values: Fill in the required fields for your selected calculation type.
  3. Calculate: Click the "Calculate" button to see the result instantly.
  4. Reset: Use the "Reset" button to clear all fields and start a new calculation.
  5. Try Examples: Click on any example in the "Examples" tab to quickly populate the calculator.

Available Calculation Types

  • What is X% of Y? - Find the percentage of a number
  • X is what % of Y? - Calculate what percentage one number is of another
  • Percentage Increase: - Calculate the percentage increase from an original value to a new value
  • Percentage Decrease: - Calculate the percentage decrease from an original value to a new value
  • Percentage Difference: - Calculate the percentage difference between two values

Percentage Calculation Formulas

Here are the mathematical formulas used in this calculator:

What is X% of Y?

Result = (X ÷ 100) × Y

X is what % of Y?

Percentage = (X ÷ Y) × 100

Percentage Increase

% Increase = [(New - Original) ÷ Original] × 100

Percentage Decrease

% Decrease = [(Original - New) ÷ Original] × 100

Percentage Difference

% Difference = |Value1 - Value2| ÷ [(Value1 + Value2) ÷ 2] × 100

Key Terms

  • Percentage: A ratio expressed as a fraction of 100
  • Original Value: The starting or initial value
  • New Value: The final or current value
  • Absolute Value: The non-negative value of a number (denoted by |x|)

Common Percentage Examples

Click on any example to try it in the calculator:

Discount Calculation

What is 20% of 150? (Common discount calculation)

Test Score Percentage

75 is what percent of 300? (Calculating test score percentage)

Salary Increase

Percentage increase from 80 to 100? (Salary raise calculation)

Price Decrease

Percentage decrease from 200 to 150? (Price drop calculation)

Price Comparison

Percentage difference between 120 and 150? (Comparing two prices)

Tip Calculation

What is 15% of 80? (Restaurant tip calculation)

Frequently Asked Questions

Is this percentage calculator free to use?
Yes, this percentage calculator is completely free to use with no limitations, registration, or subscription required.
Can I calculate percentage increase and decrease?
Yes, the calculator includes both percentage increase and percentage decrease calculations. Just select the appropriate calculation type.
What is the difference between percentage increase and percentage difference?
Percentage increase measures growth from an original to a new value, while percentage difference compares two values without assuming which is original (uses the average as reference).
Does the calculator work on mobile devices?
Yes, the calculator is fully responsive and works perfectly on all devices including smartphones, tablets, and desktop computers.
Can I use decimal numbers in calculations?
Yes, the calculator supports decimal numbers for all calculations. You can enter values like 12.5, 7.25, or 99.99.

About This Percentage Calculator

This modern percentage calculator is a comprehensive web-based tool designed to handle all common percentage calculations with a clean, intuitive interface.

Built with HTML5, CSS3, and vanilla JavaScript, this calculator provides instant results without page reloads. The tool is optimized for both desktop and mobile use, ensuring accessibility across all devices.

Key Features

  • Five Calculation Types: Handle all common percentage calculations
  • Real-time Results: Instant calculation with detailed explanations
  • Mobile-Friendly Design: Fully responsive interface
  • Preloaded Examples: Quick-start with common calculation scenarios
  • Formulas Display: Understand the math behind each calculation
  • No Installation Required: Works directly in your browser

Common Use Cases

  • Finance: Calculate discounts, interest rates, and tax amounts
  • Education: Determine test scores, grade percentages, and statistical analysis
  • Business: Analyze sales growth, profit margins, and market share
  • Personal Use: Calculate tips, recipe adjustments, and fitness progress