What can this percentage calculator do?

It can calculate X% of Y, find what percent one number is of another, and compute percentage increase or decrease between two values.

Do I need to know the formulas to use it?

No. The calculator shows the formula and a short explanation with every result so you can learn how the percentage was calculated.

Is this percentage calculator free to use?

Yes, it is completely free, works in your browser, and does not require any registration.

Calculator Tools › Percentages

Percentage Calculator

Quickly find percentages, percentage change, and what percent one number is of another with real-life examples.

Select percentage mode

Percentage (%)

Base value

Supports decimals and large numbers. You can use dot or comma as decimal separator.

Result

Your percentage result will appear here.

Percentage Calculator – Quickly Find % of Any Number

This percentage calculator helps you solve common percent problems in seconds. Whether you're checking a discount, exam score, tax, or business metrics, you can calculate "X% of Y", "X is what percent of Y" and percentage increase or decrease between two values with clear formulas and explanations.

Supported percentage calculations

X% of Y – for example: "15% of 200" to calculate tips, discounts, and taxes.
X is what percent of Y – great for grade percentages or share of total (e.g. 45 out of 60).
Percentage increase/decrease – compare old vs new value (e.g. price changes or growth rates).

How to use the percentage calculator

Select the calculation type from the top buttons.
Enter the numbers in the fields that appear for that mode.
Click "Calculate" to see the result and the underlying formula.
Use "Clear" to reset the inputs and start a new calculation.

Real-world examples

Shopping: find the final price after a 20% discount on a 3,499 item.
Studies: calculate what percentage you scored in a test (e.g. 43 out of 50).
Business: measure revenue growth between two months as a percentage change.

Percentage calculator FAQs

What is the formula for X% of Y?

The formula is (X ÷ 100) × Y. For example, 15% of 200 is (15 ÷ 100) × 200 = 30.

How do you calculate percentage increase?

Subtract the old value from the new value, divide by the old value, then multiply by 100. The calculator does this automatically and shows the formula beside the result.