Percentage Calculator

Calculate any percentage online instantly - discounts, VAT, percentage change, and more. All calculations done in your browser.

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Multiple Calculations

Calculate percentage of a number, percentage change, VAT, discounts, and more

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Instant Results

Get results instantly with client-side calculations

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Mobile Friendly

Works perfectly on all devices - desktop, tablet, and mobile

🔒 Client-Side Processing
All calculations happen in your browser. Your data never leaves your device, ensuring complete privacy and security.

Calculation type:

What is % of ?

Example: What is 25% of 200?

From to is a change of 33.33%

Example: From 150 to 200 is a 33.33% increase

Example: Add 20% VAT to $1000 = $1200

Original price: Discount: % Final price: 400.00

Example: 20% discount on $500 = $400

If is % of a number, what is the whole number?

Example: If 75 is 25% of a number, the whole is 300

Your result will appear here...

💡 For developers: Calculate percentages with:

// Percentage of a number

const result = (number * percent) / 100;

// Percentage change

const change = ((newVal - oldVal) / oldVal) * 100;

// Add VAT (20%)

const withVAT = amount * 1.20;

// Apply discount (25%)

const discounted = price * (1 - discount/100);

Understanding Percentages

A percentage is a way of expressing a number as a fraction of 100. The term "percent" comes from the Latin "per centum", meaning "by the hundred". Percentages are used in everyday life for discounts, taxes, statistics, and financial calculations.

Basic Percentage Formulas

• Percentage of a number: (number × percent) / 100
• Percentage change: ((new - old) / old) × 100
• Reverse percentage: part / (percent / 100)
• Adding VAT: amount × (1 + VAT rate)

💡 Pro Tip: To quickly calculate 10% of a number, move the decimal point one place to the left. For example, 10% of 250 is 25.0. You can then use this to calculate other percentages (5% = half of 10%, 20% = double 10%, etc.)

Common Use Cases

Scenario	Calculation	Example
Retail Discount	Original price × (1 - discount/100)	$100 item with 25% discount = $75
Sales Tax	Amount × (1 + tax rate)	$200 purchase with 8% tax = $216
Salary Increase	((new - old) / old) × 100	From $50k to $55k = 10% increase
Investment Growth	(Current value / Initial value - 1) × 100	$10k to $12.5k = 25% growth

Percentage Calculation Methods

Method	When to Use	Accuracy	Speed
Percentage of Number	Finding a portion of a value (discounts, commissions)	Exact	Instant
Percentage Change	Comparing values over time (growth, inflation)	Exact	Instant
VAT Calculator	Adding or removing sales tax from amounts	Exact	Instant
Mental Math	Quick estimates without tools (10% method)	Approximate	Fastest

💡 For precise financial calculations, always use exact percentage methods rather than mental math. Our calculator provides exact results for all percentage scenarios.

Frequently Asked Questions

How do I calculate a percentage of a number?

To calculate a percentage of a number, multiply the number by the percentage and divide by 100. For example, to find 20% of 150: (150 × 20) / 100 = 30. You can also convert the percentage to a decimal (20% = 0.20) and multiply: 150 × 0.20 = 30.

What's the difference between percentage points and percent change?

Percentage points refer to the absolute difference between two percentages (e.g., going from 10% to 15% is a 5 percentage point increase). Percent change refers to the relative difference (e.g., going from 10% to 15% is a 50% increase).

How do I calculate percentage increase or decrease?

Subtract the original value from the new value, divide by the original value, and multiply by 100. Formula: ((New - Original) / Original) × 100. A positive result is an increase, negative is a decrease.