A percentage calculator is an essential everyday math tool. Whether you're figuring out a discount while shopping, calculating a grade on a test, or analyzing year-over-year business growth, percentages are everywhere. This free online percentage calculator combines the three most common percentage operations into a single convenient interface.
"What is X% of Y?" helps you find a portion of a number — ideal for computing tips, taxes, or discounts. "X is what % of Y?" determines the ratio between two values as a percentage — perfect for grades, statistics, or proportions. "Percentage change from X to Y" calculates the increase or decrease between two values, commonly used in finance, analytics, and reporting. All calculations happen instantly in your browser with no server round-trip.