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Percentage Calculator

Calculate percentages — find X% of Y, percentage change, increase and decrease.

% of= ?

🔒 All calculations happen in your browser — no data is sent to any server.

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Percentage Calculator — Find Any Percentage Instantly

Our free percentage calculator handles the three most common percentage operations in one tool. Whether you need to find a percentage of a number, determine what percentage one number is of another, or calculate the percentage change between two values, just enter your numbers and get instant results with the formula shown step-by-step. Percentage calculations appear everywhere — from shopping discounts and restaurant tips to grade calculations and business analytics.

How to use Percentage Calculator

  • Select the calculation type: "X% of Y", "X is what % of Y", or "% change from X to Y".
  • Enter your numbers in the input fields.
  • See the result instantly with the step-by-step formula shown.
  • Copy the result to clipboard with one click.

Features

  • Three calculation modes — "% of number", "X is what % of Y", and "% change" all in one tool.
  • Step-by-step formula — See exactly how each result is calculated.
  • Real-time calculation — Results update as you type.
  • Handles decimals and negatives — Works with any valid number.
  • Copy result — One-click copy to clipboard.
  • 100% browser-based — No server needed.

Frequently Asked Questions

How do I calculate a percentage of a number?

Multiply the number by the percentage and divide by 100. For example, 20% of 150 = (150 × 20) / 100 = 30. Our calculator does this instantly — enter the percentage and number to see the result with the formula shown.

How do I calculate percentage increase between two numbers?

Use the formula: ((New Value - Old Value) / Old Value) × 100. Enter both values in our percentage change calculator to see the result automatically, including whether it's an increase or decrease.

What is the difference between percentage change and percentage difference?

Percentage change measures the shift from an old value to a new value with a clear direction (increase or decrease). Percentage difference compares any two values using their average as the base, without implying direction. Our calculator supports both.