Four Ways to Calculate a Percentage
"Percentage" questions usually come in one of four everyday shapes: finding a portion of a number, finding what percent one number is of another, finding the percentage change between two numbers, or working out a discounted price. This tool covers all four in one place so you don't need to remember which formula applies to which situation.
The Core Percentage Formula
X% of Y = (X ÷ 100) × Y. For example, 15% of 200 = (15 ÷ 100) × 200 = 30. Every other percentage calculation on this page is a variation of this same basic relationship, just solving for a different piece of the equation.
Percentage Change Explained
Percentage change measures how much a number has grown or shrunk relative to its starting value: ((New − Old) ÷ Old) × 100. A positive result means an increase, a negative result means a decrease. This is the calculation behind salary hikes, investment returns, and price changes over time.
Calculating a Discount
To find a discounted price, multiply the original price by the discount percentage to get the amount saved, then subtract that from the original price. A ₹1,500 item at 20% off saves you ₹300, bringing the final price to ₹1,200 — exactly what the Discount tab above calculates instantly.