← All Tools

Percentage Calculator

Calculate percentages, increases, decreases, and differences easily with our comprehensive percentage calculators.

What is X% of Y?

Calculate a percentage of a number

%

X is what % of Y?

Find what percentage one number is of another

Percentage Increase

Calculate percentage increase from one value to another

Percentage Decrease

Calculate percentage decrease from one value to another

Add Percentage

Add a percentage to a number

%

Subtract Percentage

Subtract a percentage from a number

%

Support TinyToolWeb

Help us keep these tools free and ad-free! Your support allows us to create more useful tools.

About Percentage Calculator

Our comprehensive percentage calculator helps you solve various percentage problems quickly and easily. Whether you're calculating discounts, tips, grade scores, or financial percentages, we've got you covered.

Calculators Available

  • What is X% of Y: Calculate a percentage of any number (e.g., 15% of 200 = 30)
  • X is what % of Y: Find what percentage one number represents of another (e.g., 50 is 25% of 200)
  • Percentage Increase: Calculate the percentage growth between two values (e.g., 100 to 150 = 50% increase)
  • Percentage Decrease: Calculate the percentage reduction between two values (e.g., 150 to 100 = 33.33% decrease)
  • Add Percentage: Add a percentage to a number (e.g., 100 + 20% = 120)
  • Subtract Percentage: Subtract a percentage from a number (e.g., 100 - 20% = 80)

Common Uses

  • Calculate discounts and sales prices
  • Determine tax amounts
  • Calculate tips at restaurants
  • Track grade scores and test percentages
  • Analyze financial data and growth rates
  • Calculate interest rates

How Percentages Work

A percentage is a way to express a number as a fraction of 100. The word "percent" means "per hundred." For example, 50% means 50 per 100, or 50/100, which equals 0.5 or one half.

Percentage Formulas

  • Basic: (Percentage / 100) × Number = Result
  • Find Percentage: (Part / Whole) × 100 = Percentage
  • Percentage Change: ((New - Old) / Old) × 100 = % Change

Tips for Using Percentages

  • To convert a decimal to a percentage, multiply by 100 (0.75 = 75%)
  • To convert a percentage to a decimal, divide by 100 (75% = 0.75)
  • Remember: finding 20% of a number is the same as multiplying by 0.20
  • A 50% increase means the final value is 150% of the original (not 50%)