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Percentage Calculator

Calculate percentages easily.

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Percentages Demystified

Percentages are a fundamental part of daily life, used to express a number as a fraction of 100. Whether you're calculating a tip, a discount, or a tax rate, understanding how they work is essential.

A black and white cartoon of a pie chart being sliced into clearly labeled percentage segments.A black and white cartoon of a pie chart being sliced into clearly labeled percentage segments.

Common Formulas

There are three main ways we use percentages:

Find the Part

X% * Y = ?

What is 20% of 50? (Answer: 10)

Find the Percentage

X / Y = ?%

10 is what percent of 50? (Answer: 20%)

Percentage Change

(B - A) / A

How much did a value increase or decrease? (New - Old) / Old.

Real World Examples

  • Shopping: Calculating the final price after a 30% discount.
  • Dining: Adding a 15% or 20% tip to a restaurant bill.
  • Finance: Understanding interest rates on loans or savings accounts.
A black and white cartoon of a shopping tag with a big red discount sticker showing a percentage off.A black and white cartoon of a shopping tag with a big red discount sticker showing a percentage off.

Learn More

Brush up on your math skills with the Wikipedia entry on Percentages.

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