Percentage Calculator
8-in-1Solve any percentage problem instantly — from finding X% of a number to calculating percentage change, discounts, original values, and more.
What is X% of Y?
Find the percentage value of a number.
X is what % of Y?
Find what percentage one number is of another.
Percentage Change
Calculate % increase or decrease between two values.
Add Percentage to Number
Increase a number by a percentage (e.g. add GST).
Subtract Percentage from Number
Decrease a number by a percentage (e.g. apply discount).
Find Original Value
After a % increase/decrease, what was the original?
Ratio to Percentage
Convert a ratio (X out of Y) to a percentage.
Split Amount by Percentage
Split a total amount into two parts by percentage.
Common Uses of Percentage Calculations
Discounts
Calculate final price after 10%, 20%, or 50% off on products.
GST & Taxes
Add or subtract GST (5%, 12%, 18%, 28%) from any amount.
Profit & Loss
Find % profit or loss on buying and selling price.
Exam Scores
Convert marks to percentage and check grade.
Stock Returns
Calculate % gain or loss on your investments.
Interest Rates
Find how much interest you earn or pay as a percentage.
Salary Hike
Calculate new salary after a % increment.
Markup Pricing
Find selling price after adding a % markup on cost.
Percentage Formulas Reference
(P ÷ 100) × N18% of 50,000 = 9,000(X ÷ Y) × 10025 is 12.5% of 200((New − Old) ÷ Old) × 1001000 → 1200 = +20%((Old − New) ÷ Old) × 1001000 → 800 = −20%Y × (1 + X/100)1000 + 18% = 1180Y × (1 − X/100)1000 − 20% = 800Result ÷ (1 + X/100)1180 before +18% = 1000(Part ÷ Whole) × 10045/60 = 75%Frequently Asked Questions
How do I calculate what percentage X is of Y?
Divide X by Y and multiply by 100. Formula: (X ÷ Y) × 100. For example, 25 is what % of 200? → (25 ÷ 200) × 100 = 12.5%.
How do I calculate percentage change?
Subtract the old value from the new value, divide by the old value, and multiply by 100. Formula: ((New − Old) ÷ Old) × 100. A positive result is an increase; negative is a decrease.
How do I add a percentage to a number?
Multiply the number by (1 + percentage/100). For example, to add 18% GST to ₹1,000: 1000 × 1.18 = ₹1,180.
How do I find the original price after a discount?
Divide the discounted price by (1 − discount%/100). For example, if a product costs ₹800 after a 20% discount, the original price is 800 ÷ 0.8 = ₹1,000.
What is percentage and how is it used in daily life?
Percentage is a way of expressing a number as a fraction of 100. It is used in taxes (GST, income tax), discounts, interest rates, exam scores, profit/loss calculations, and many other everyday situations.