Percentage Calculator

Free online percentage calculator with 5 different calculation types. Calculate percentage of value, percentage change, increase/decrease, and more. Perfect for discounts, taxes, and financial calculations.

Calculate the percentage of a value
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Calculate the percentage one number is of another number
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Calculate the percentage change in value
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To increase or decrease a specific rate
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Find the X value
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What is a Percentage Calculator?

A percentage calculator is a mathematical tool that helps you perform various percentage-related calculations quickly and accurately. It's essential for financial planning, business calculations, academic work, and everyday life situations.

Types of Percentage Calculations

1. Calculate Percentage of a Value

Find what a certain percentage of a number equals. For example, 25% of 200 = 50.

2. Calculate What Percentage One Number is of Another

Determine what percentage one number represents of another. For example, 50 is 25% of 200.

3. Calculate Percentage Change

Find the percentage increase or decrease between two values. For example, from 100 to 150 is a 50% increase.

4. Increase or Decrease by Percentage

Calculate the result of increasing or decreasing a number by a certain percentage. For example, 200 increased by 25% = 250.

5. Find the Original Value (X)

Determine the original value when you know a number and what percentage it represents. For example, if 50 is 25% of X, then X = 200.

Common Applications

  • Financial calculations (interest rates, discounts, taxes)
  • Business analysis (profit margins, growth rates)
  • Academic work (statistics, data analysis)
  • Shopping (discounts, sales tax)
  • Investment planning (returns, portfolio analysis)
  • Grade calculations (test scores, GPA)
  • Population studies (growth rates, demographics)
  • Scientific research (error margins, confidence intervals)

Mathematical Formulas

  • Percentage of Value: (percentage ÷ 100) × value
  • What Percentage: (number ÷ total) × 100
  • Percentage Change: ((new - old) ÷ old) × 100
  • Increase/Decrease: value ± (percentage ÷ 100) × value
  • Find X: (number ÷ percentage) × 100