How do I calculate percentage of a number?

To find X% of Y, multiply Y by X and divide by 100. For example, 20% of 500 = (500 × 20) ÷ 100 = 100.

How do I calculate percentage change?

Percentage change = ((New Value - Old Value) ÷ Old Value) × 100. A positive result means an increase and a negative result means a decrease.

What is the difference between percentage and percentile?

Percentage is a ratio expressed as a fraction of 100. Percentile is a value below which a percentage of data falls. For example, scoring in the 90th percentile means you scored higher than 90% of others.

Percentage Calculator

Calculate percentage of a number, percentage change, percentage difference, and add or subtract percentages — all with step-by-step explanations.

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Percentage Calculator

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Free Online Percentage Calculator

Our percentage calculator gives you five powerful tools in one — calculate the percentage of any number, find what percentage one number is of another, calculate percentage change between two values, and add or subtract a percentage from any number. Each result comes with a step-by-step formula explanation so you understand exactly how the answer is reached.

Whether you are calculating a discount at a shop, finding your exam score percentage, calculating GST, comparing salary hikes, or working out investment returns — our tool handles every percentage scenario instantly.

Common Percentage Formulas

Calculation	Formula	Example
X% of Y	(X ÷ 100) × Y	20% of 500 = 100
X is what % of Y	(X ÷ Y) × 100	100 is 20% of 500
% Increase	((New − Old) ÷ Old) × 100	200 to 250 = +25%
% Decrease	((Old − New) ÷ Old) × 100	250 to 200 = −20%
Add % to number	Number × (1 + % ÷ 100)	1000 + 18% = 1180
Subtract % from number	Number × (1 − % ÷ 100)	1000 − 10% = 900

Real World Uses of Percentage Calculations

Shopping discounts — If a shirt costs ₹800 and has a 30% discount, use the "Add/Subtract %" calculator to find the final price: ₹800 − 30% = ₹560. GST calculation — Add 18% GST to any price in seconds. Exam marks — Scored 76 out of 120? Use "X is what % of Y" to find your percentage: 63.33%. Salary hike — Got a 12% hike on ₹45,000? Add 12% to find new salary: ₹50,400.

Frequently Asked Questions

How do I calculate percentage of marks?

Divide your obtained marks by total marks and multiply by 100. Example: 450 out of 600 = (450 ÷ 600) × 100 = 75%. Use the "X is what % of Y" tab above.

How do I calculate percentage increase or decrease?

Use the "% Change" tab. Enter the original value and new value. The calculator shows the percentage increase or decrease with the formula. Positive result = increase, negative = decrease.

How to calculate GST percentage?

Use the "Add/Subtract %" tab. Enter the base price, select Add, enter your GST rate (5%, 12%, 18% or 28%), and get the final price including GST instantly.

What is 1% of 1 lakh?

1% of 1,00,000 = 1,000. Use the "% of Number" tab and enter 1 and 100000 to verify this instantly.

Is this percentage calculator free?

Yes, completely free. No login, no limits, no watermarks. All calculations happen instantly in your browser.