Percentage Calculator

Percentage Calculator — Three Modes in One

Calculate percentages instantly in three different ways. Find a percentage of a number, determine what percent one number is of another, or calculate percentage change between two values.

Mode 1: Find X% of Y

What is a percentage of a number? Formula: Result = (X ÷ 100) × Y. Example: 20% of 150 = 30. Perfect for calculating discounts, tips, commission, and tax amounts.

Mode 2: X is What % of Y

Express one value as a percentage of another. Formula: Percentage = (X ÷ Y) × 100. Example: 30 out of 150 is 20%. Ideal for test scores, completion rates, budget allocation, and market share analysis.

Mode 3: Percentage Change

Calculate increase or decrease between two values. Formula: Change = ((New - Original) ÷ Original) × 100. Example: Growth from 100 to 120 = +20%. Used for stock returns, price changes, salary increases, and population growth.

Real-World Applications

• Restaurant tipping (15-20% of bill)
• Shopping discounts ("30% off" sales)
• Investment tracking (portfolio percentage returns)
• Academic grading (percentage scores)
• Sales tax and VAT calculations
• Fitness tracking (body fat percentage changes)