Percentage Calculator

What Is a Percentage?

A percentage is a way of expressing a number as a fraction of 100. It's used everywhere — discounts, tax rates, grades, statistics, and financial growth — as a standardized way to compare proportions.

Formulas Used

X% of Y: Result = (X ÷ 100) × Y

X is what percent of Y: Result = (X ÷ Y) × 100

Percentage change from X to Y: Result = [(Y − X) ÷ X] × 100

How to Use This Calculator

Choose the type of calculation you need from the three options above, enter your numbers, and click "Calculate" for an instant result.

Common Uses for Each Mode

"What is X% of Y?" is useful for calculating discounts, tips, or tax amounts. "X is what percent of Y?" helps find test scores, completion rates, or proportions. "Percentage increase/decrease" is used for tracking growth, price changes, or performance comparisons over time.

Frequently Asked Questions

How do I calculate a discount using percentages?

Use "What is X% of Y?" with the discount percentage as X and the original price as Y to find the discount amount, then subtract it from the original price.

Why is my percentage change negative?

A negative result means the value decreased from X to Y. A positive result means it increased.

What's the difference between percentage points and percent?

Percentage points refer to the raw difference between two percentages (e.g., 40% to 50% is a 10 percentage point increase), while percent change measures the relative change (a 25% increase in that example).

Can I use this for grade calculations?

Yes, use "X is what percent of Y?" with your score as X and the total possible points as Y to find your percentage grade.