Percentage Calculator
Three common percentage questions, one tool.
The three percentage formulas
"X% of Y" multiplies Y by X divided by 100 — useful for discounts, tips, and tax. "X is what percent of Y" divides X by Y and multiplies by 100 — useful for figuring out a share or a grade. "Percent change from X to Y" takes (Y minus X) divided by X, multiplied by 100 — a positive result is an increase, a negative result is a decrease, and this is the formula behind price changes, growth rates, and pay raises.
How to use a percentage calculator
A percentage is a way to express a number as a part of 100. This calculator covers common questions such as “What is 15% of 800?”, “25 is what percent of 200?” and “How much did a value increase or decrease?” Enter the numbers that match your question and use the result as a quick check for your own calculation.
For percentage change, the calculator compares the difference between the original and new values with the original value. This is useful for tracking price changes, sales growth, discounts and other everyday comparisons.
Percentage calculator examples
If an item costs ₹1,000 and the discount is 15%, the discount amount is ₹150 and the price after discount is ₹850. For a change from 100 to 120, the percentage increase is 20%.
Frequently asked questions
What is 10% of a number? Divide the number by 10. For example, 10% of 500 is 50.
How is percentage change different from percentage difference? Percentage change normally uses the original value as the reference, while percentage difference compares two values without treating one as the starting point.