Understanding Percentages – A Simple Guide

Percentages are everywhere – discounts, interest rates, exam scores, tax rates, and even nutrition labels. A percentage means "per hundred". For example, 20% means 20 out of every 100. Our calculator instantly finds any percentage of any number.

Common Use Cases

• Shopping Discounts: "30% off" on a ₹2000 shirt – you save ₹600, pay ₹1400.
• Exam Scores: Scored 45 out of 75? That's 60% (45/75 × 100).
• Interest Rates: If a bank offers 7% annual interest on ₹10,000, you earn ₹700 per year.
• Tax Calculation: 5% GST on ₹1000 = ₹50 tax.
• Health & Fitness: Body fat percentage, daily calorie percentage, etc.

The Simple Formula

To find X% of Y: Result = (X × Y) / 100. Example: What is 15% of 200? (15 × 200) / 100 = 30. Our calculator does this instantly – no mental math needed.

Other Percentage Operations (Mental Math Tricks)

• Finding percentage increase: (New - Old) / Old × 100. Price increased from ₹50 to ₹60 = 20% increase.
• Finding percentage decrease: (Old - New) / Old × 100. Price dropped from ₹80 to ₹60 = 25% decrease.
• Reverse percentage: If 30% of a number is 90, the number is 90 / (30/100) = 300.

Quick Percentage Shortcuts

• 10% of a number = divide by 10 (10% of 250 = 25).
• 5% = half of 10% (5% of 250 = 12.5).
• 1% = divide by 100 (1% of 250 = 2.5).
• 50% = half the number.
• 25% = quarter of the number (divide by 4).

Use our calculator whenever you see a percentage – it's free and works on mobile too. Bookmark this page for quick access during shopping or studying.