Free Percentage Calculator: Calculate Change, Difference & Value

Solve any percentage problem instantly. Calculate percentage increase/decrease, find what percent X is of Y, or compute discount prices.

Percentage Calculator

Select a calculation mode below

What is % of ?
Result
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Formula: (20 / 100) * 150
Change from to ?
Percentage Change
-
Formula: ((80 - 50) / 50) * 100
is what % of ?
Result
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Formula: (12 / 60) * 100

The All-in-One Percentage Tool

Percentages are everywhere—from calculating a tip at a restaurant to figuring out how much a discount saves you during a sale. However, the math isn't always intuitive. The GungorKaya.com Percentage Calculator is designed to solve the three most common percentage problems instantly.

1. Calculating a Value (What is X% of Y?)

Use this mode when you know the percentage and the total amount, but need the specific number. For example: "What is 20% of $150?" This is perfect for calculating tips, tax, or commissions.

2. Calculating Percentage Change (Increase/Decrease)

Use this mode to find the growth or decline between two numbers. For example: "My rent went from $1000 to $1200. What is the percentage increase?" This is essential for analyzing financial growth, weight loss, or price inflation.

3. Finding the Percentage (X is what % of Y?)

Use this mode when you have a part and a whole, and need to know the ratio. For example: "I answered 45 questions correctly out of 50. What is my score?"

Why Use This Tool?

Our calculator runs 100% Client-Side. This means calculations happen instantly in your browser with zero delay. It works offline, is mobile-friendly, and respects your privacy.

Frequently Asked Questions

How do I calculate a percentage increase?
To find the increase percentage: First, subtract the original number from the new number. Then, divide that difference by the original number. Finally, multiply by 100. Or simply use the "Percentage Change" tab above.
How do I find 20% of a number?
Multiply the number by 0.20. For example, to find 20% of 50, you calculate 50 * 0.20 = 10.
What is the formula for percentage change?
The formula is: ((New Value - Old Value) / Old Value) * 100. If the result is positive, it's an increase. If negative, it's a decrease.
How do I calculate a discount?
If an item is 30% off, multiply the original price by 0.30 to find the discount amount. Subtract that amount from the original price to find the final sale price.
How to convert a fraction to a percentage?
Divide the top number (numerator) by the bottom number (denominator) and multiply the result by 100. Example: 1/4 = 0.25 * 100 = 25%.
What does "per cent" mean?
"Per cent" comes from the Latin "per centum," meaning "by the hundred." It represents a fraction of 100.
Can percentages be greater than 100?
Yes. For example, if a price doubles, it has increased by 100%. If it triples, it has increased by 200%.
Is this calculator free?
Yes, the GungorKaya.com Percentage Calculator is completely free to use with no limits or ads.
Does it work offline?
Yes. Since the calculation script runs in your browser (Client-Side), you can continue to use the tool even if you lose your internet connection.
How accurate is the result?
Our calculator uses standard mathematical floating-point arithmetic, providing high precision for everyday financial and academic calculations.