Percentage Calculator

Calculate percentages — what is X% of Y, what % is X of Y, and percentage change.

What is X% of Y?
What % is X of Y?
Percentage change from A to B

How to use this tool

1
Open Percentage Calculator
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2
Enter your data
Paste or type your input. Results appear instantly.
3
Copy or download
Export your result with one click — ready to use anywhere.
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FAQ

How do I calculate X% of Y?
Multiply Y by X and divide by 100. For example, 20% of 150 = 150 × 20 / 100 = 30.
How do I find percentage change?
Percentage change = (New − Old) / Old × 100. Positive is an increase, negative is a decrease.
What is the difference between percentage and percentage points?
If a rate goes from 10% to 12%, it increased by 2 percentage points but by 20% (since 2 is 20% of 10). These are easy to confuse — percentage points measure the arithmetic difference, while percentage measures the relative change.
How do I calculate a percentage increase?
Percentage increase = (New − Old) ÷ Old × 100. If a price goes from $80 to $100, the increase is (100 − 80) ÷ 80 × 100 = 25%.
How do I reverse a percentage to find the original?
If a value after a 20% increase is $120, the original is $120 ÷ 1.2 = $100. Divide by (1 + percentage/100) to reverse an increase, or by (1 − percentage/100) to reverse a decrease.

About Percentage Calculator

Percentages appear in almost every area of daily life — discounts, tax rates, interest rates, grade scores, statistics, nutrition labels, and financial reports. This calculator handles all three common percentage problems in one place: finding a percentage of a number, finding what percentage one number is of another, and calculating the percentage change between two values.

The Three Percentage Formulas

What is X% of Y? Answer: Y × X ÷ 100. (What is 15% of 200? → 200 × 15 ÷ 100 = 30.) X is what percent of Y? Answer: X ÷ Y × 100. (30 is what % of 200? → 30 ÷ 200 × 100 = 15%.) Percentage change from X to Y: (Y − X) ÷ X × 100. (From 80 to 100 → (100 − 80) ÷ 80 × 100 = 25% increase.)

Percentage vs Percentage Points

One of the most common confusions in statistics and finance: a rate changing from 10% to 12% is an increase of 2 percentage points, but a 20% increase (since 2 is 20% of 10). Politicians and marketers exploit this ambiguity frequently. When you see a headline about a rate change, look for which measure is being used — they tell very different stories.

Common Real-World Uses

Use Mode 1 to calculate sale discounts (30% off $80), tips (18% of $65 bill), and tax amounts (8.5% VAT on $200). Use Mode 2 to find your exam score as a percentage (47 correct out of 60 questions = 78.3%), or to find a company's profit margin (net profit ÷ revenue × 100). Use Mode 3 to compare year-over-year revenue growth, stock price changes, or to check whether a "50% off sale" followed by "50% markup" actually returns to the original price (it doesn't — you lose 25%).

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