Percentage Calculator
Calculate percentages instantly. Find percentage of a number, percentage change, increase/decrease, and percentage difference.
What is X% of Y?
X is what % of Y?
Percentage Change from X to Y
Increase / Decrease a Number by Percentage
Percentage Difference between X and Y
About Percentage Calculator
Percentage math comes up in everyday situations — calculating a tip, working out a sale discount, understanding a salary hike, computing exam scores, or comparing year-over-year growth. This percentage calculator handles every common variant: what is X% of Y, what percent is X of Y, the percentage change between two numbers, percentage increase or decrease, and reverse calculations to find the original amount before a percentage was applied.
Each calculation mode has its own input fields, so you do not need to remember the formula — just pick what you are trying to find and fill in the values you know. Useful for shopping math (final price after discount), financial analysis (percentage growth between periods), academic work (computing weighted averages), and quick mental-math verification when negotiating.
How to Use
Choose the type of percentage calculation you need.
Enter the numbers in the input fields.
Results are calculated instantly as you type.
Use the different sections for various percentage operations.
Frequently Asked Questions
How do I calculate percentage of a number?
To find X% of Y, multiply Y by X and divide by 100. For example, 20% of 150 = (20 × 150) / 100 = 30.
What is percentage change?
Percentage change measures how much a value has increased or decreased relative to its original value. Formula: ((New - Old) / |Old|) × 100. A positive result means increase, negative means decrease.
What is percentage difference?
Percentage difference compares two values relative to their average. It's useful when neither value is the 'original'. Formula: (|A - B| / average(A, B)) × 100.
Percentage Calculator: 5 Ways to Calculate Percentages Online
From discount calculations to grade percentages to financial growth — percentage math comes up daily. Our calculator handles five common percentage scenarios.
Read the full guide