Online Percentage Calculator

Our free percentage calculator makes complex math problems simple. Whether you need to calculate discounts, grades, or market changes, get instant results with precision.

What is (X%)

Of this Number (Y)

Result

How to calculate percentages easily?

Percentages are a fundamental part of everyday math, but remembering which number to divide or multiply can get confusing. The word "percent" literally translates to "per one hundred" in Latin (per centum). So when we say 25%, we are actually saying 25 out of every 100, which is the same as the fraction 1/4.

Our tool provides three specific calculators to solve the most common real-world math problems instantly without needing to memorize formulas.

The Three Calculation Modes

Find X% of Y

X / 100 * Y

Best for: Calculating sales tax, determining a tip at a restaurant, or figuring out exactly how much money a 20% discount will save you.

What % of X is Y?

X / Y * 100

Best for: Finding out your grade on a test (e.g., you scored 42 out of 50, which is 84%), or determining what percentage of a goal you have completed.

Percent Change

(Y - X) / X * 100

Best for: Business reporting, stock market analysis, or seeing how much your rent increased from last year compared to this year.

Frequently Asked Questions

How do I calculate a percentage of a number?+

To find the percentage of a number, you multiply the number by the percentage fraction. For example, to find 20% of 50, you multiply 50 by 0.20 (which is 20/100). The answer is 10. Our calculator does this for you instantly in the 'Find X% of Y' tab.

How do you calculate percentage increase or decrease?+

To calculate the percentage change between two numbers, subtract the old value from the new value, then divide that result by the absolute value of the old value. Finally, multiply by 100. For example, moving from a price of $40 to $50 is a 25% increase.

Can I use this to calculate discounts?+

Yes! If a shirt costs $40 and is 25% off, you can use the 'Find X% of Y' tab. Enter 25 for X and 40 for Y. The result is 10, which means your discount is $10. Your final price would be $40 - $10 = $30.