How do I calculate X% of Y?

Multiply X by Y and divide by 100. For example, 15% of 200 = (15 × 200) / 100 = 30. Our calculator does this instantly.

How do I calculate percentage change?

Percentage change = ((New Value - Old Value) / Old Value) × 100. A positive result is a percentage increase; negative is a percentage decrease.

How do I find the original price after a percentage discount?

Original Price = Discounted Price / (1 - Discount%). For example, if an item costs ₹850 after a 15% discount, the original price was 850 / 0.85 = ₹1,000.

What is the percentage difference between two numbers?

Percentage difference = |Value1 - Value2| / ((Value1 + Value2) / 2) × 100. This is different from percentage change as it doesn't assume one value is the "starting" point.

How do I add a percentage to a number?

To increase a number by X%: New Value = Original × (1 + X/100). For example, adding 10% to 500: 500 × 1.10 = 550. Use our calculator to find this instantly.

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Percentage Calculator

Calculate percentages, percent changes, and what percent one number is of another.

Updated Mar 2026100% Private — runs in browser

Percentage (%)

Of Number

How to Use Percentage Calculator

1
Choose the type of percentage calculation you need from the tabs.
2
Enter the numbers in the input fields provided.
3
The result updates instantly as you type.
4
Read the step-by-step explanation below the result to understand the math.
5
Switch between calculation types without losing your inputs.

About Percentage Calculator

Our free percentage calculator covers every common percentage problem in one place — finding X% of a number, calculating what percentage X is of Y, finding the original value before a change, and calculating percent change between two values. With step-by-step working shown for every result.

Key Features

All Percentage Types: X% of Y, Y as % of X, original value, and percent change.
Step-by-Step Solutions: See the formula and working for every calculation.
Instant Results: Results update as you type — no need to click Calculate.
Multi-Tab Layout: Switch between calculation types without losing your input.

Who Is This For?

Students calculating exam scores and grade percentages, shoppers computing sale discounts, business owners working out profit margins and growth rates, and accountants doing tax and GST calculations.

Privacy & Security

Runs 100% in your browser — no signup, no uploads, no data stored.