Percentage Calculator

Calculate percentages, percentage change, increase and decrease

What is X% of Y?

Enter values to calculate

Quick Examples

Percentage Formulas

X% of Y

Result = (X / 100) × Y

X is what % of Y

% = (X / Y) × 100

% Change

% = ((New - Old) / Old) × 100

Increase/Decrease

Result = X × (1 ± Y/100)

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Percentage Calculator – All Percentage Calculations

Our Percentage Calculator handles all your percentage needs in one place. Whether you need to find what X% of a number is, calculate percentage change, or determine discounts, this tool provides instant, accurate results.

Four Types of Percentage Calculations

1. What is X% of Y?

Find a percentage of any number. Perfect for calculating tips, discounts, tax amounts, or any portion of a value.

Formula: Result = (X / 100) × Y

2. X is What % of Y?

Determine what percentage one number is of another. Useful for grades, performance metrics, and comparing values.

Formula: % = (X / Y) × 100

3. Percentage Change

Calculate the percent increase or decrease between two values. Essential for tracking growth, price changes, or performance over time.

Formula: % Change = ((New - Old) / Old) × 100

4. Increase or Decrease by %

Apply a percentage increase or decrease to any value. Perfect for calculating sale prices, raises, or adjustments.

Formula: Result = Value × (1 ± Percentage/100)

Common Percentage Examples

  • 15% tip on $80: 15% of 80 = $12
  • 20% discount on $50: 50 decreased by 20% = $40
  • Score ratio: 45 out of 60 = 75%
  • Price increase: $100 to $125 = 25% increase

Frequently Asked Questions

How do I calculate a percentage of a number?

Divide the percentage by 100, then multiply by the number. For example, 25% of 200 = (25/100) × 200 = 50.

What's the difference between percentage increase and percentage change?

They're the same calculation. Percentage change can be positive (increase) or negative (decrease). A 50% change from 100 to 150 means a 50% increase.

How do I reverse a percentage?

To find the original value after a percentage increase, divide by (1 + %/100). After a 20% increase to $120, original = 120 / 1.2 = $100.

How do I calculate successive percentages?

Apply each percentage sequentially. A 20% discount then 10% off is NOT 30% total. $100 → $80 (20% off) → $72 (10% off) = 28% total discount.

What is basis points vs percentage?

One basis point = 0.01%. So 50 basis points = 0.5%. Basis points are commonly used in finance for interest rates.

Calculate Percentages Now

Use our free Percentage Calculator for instant results. Works on any device, no signup required. Just enter your numbers and get accurate answers immediately!