What is Percentage?

A percentage is a number expressed as a fraction of 100. The word comes from Latin "per centum" meaning "by the hundred". Percentages are used everywhere — from discounts and interest rates to exam scores and statistics. They make it easy to compare quantities of different scales on a common ground.

Common Percentage Calculations

1. Finding X% of Y: Multiply X by Y and divide by 100. Example: 20% of 500 = (20 × 500) ÷ 100 = 100.

2. Finding what % X is of Y: Divide X by Y and multiply by 100. Example: 25 is what % of 200 = (25 ÷ 200) × 100 = 12.5%.

3. Percentage Increase: (New − Old) ÷ Old × 100. Example: Price goes from ₹100 to ₹120 → (120 − 100) ÷ 100 × 100 = 20% increase.

4. Percentage Decrease: (Old − New) ÷ Old × 100. Example: Price drops from ₹100 to ₹80 → 20% decrease.

Real-Life Uses of Percentage

• Shopping discounts (Flat 50% off)
• Interest rates on loans and savings
• Exam marks and grades
• Tax calculations (GST, income tax)
• Business profit and loss
• Population growth statistics
• Bank interest calculations

Quick Percentage Tricks

• To find 10%, move decimal one place left (10% of 250 = 25)
• To find 1%, move decimal two places left (1% of 250 = 2.5)
• To find 50%, just divide by 2 (50% of 250 = 125)
• To find 25%, divide by 4
• To find 5%, find 10% and half it

Percentage vs Percentile

Percentage and percentile are often confused. A percentage tells you what fraction of 100 something is. A percentile tells you where you stand relative to others. For example, scoring 80% means you got 80 out of 100. Being in the 80th percentile means you scored better than 80% of people.

Why Use Our Percentage Calculator?

Our free percentage calculator handles both common types — finding X% of Y and finding what % X is of Y — in one place. Perfect for students, shoppers, business owners, and anyone who needs quick percentage calculations. Works on mobile, no signup required.