Free Percentage Calculator Online: Calculate Percentage, Increase, Decrease and Discount
Need a quick answer for marks, discounts, salary raises or price changes? This free percentage calculator works out the percentage of a number, the percentage increase or decrease, and discounts or added tax in seconds. It is simple, fast and works on any phone or computer.
Percentage Calculator
Four quick tools in one place. Enter your numbers and press Calculate.
1. What is X% of Y?
2. X is what % of Y?
3. Percentage increase or decrease
4. Discount or add a percentage
What Is a Percentage Calculator?
A percentage calculator is a simple online tool that does the maths of percentages for you in a second. A percentage means "out of 100", so 25% is the same as 25 out of every 100. People use percentages every day, whether they are checking exam marks, working out a shop discount, comparing salaries or reading a bank statement. Doing these sums by hand is slow and easy to get wrong, especially with large numbers or decimals. This free percentage calculator gives you the answer instantly, with no sign-up and no app to install.
What You Can Calculate Here
The calculator above has four tools in one place. The first finds a percentage of a number, for example 15% of 8,000. The second tells you what percentage one number is of another, which is perfect for marks, attendance and test scores. The third measures percentage increase or decrease between an old and a new value, which is useful for salary raises, price changes and business growth. The fourth works out a discount or adds a percentage such as sales tax to a price, so you know the final amount before you pay.
Simple Formulas to Remember
Even without a calculator, the main formulas are easy. To find a percentage of a number, multiply the number by the percentage and divide by 100. To find what percentage a part is of a whole, divide the part by the whole and multiply by 100. To find percentage change, subtract the old value from the new value, divide by the old value and multiply by 100. A positive result is an increase and a negative result is a decrease.
Real-Life Examples
Suppose a student scores 425 marks out of 500. Dividing 425 by 500 and multiplying by 100 gives 85%. If a jacket costs Rs. 2,500 and the shop offers 20% off, the discount is Rs. 500, so you pay Rs. 2,000. If a monthly salary rises from Rs. 50,000 to Rs. 55,000, the increase is Rs. 5,000, which is a 10% raise. These everyday cases show why a quick and reliable percentage tool is so useful.
Tips for Accurate Results
Always check which value is the whole before you start, because mixing up the part and the whole is the most common mistake. For percentage change, the old value must go in the first box. Remember that a 50% increase followed by a 50% decrease does not bring you back to the start, since the second percentage is taken from a larger number. Finally, round only at the end so small errors do not add up.
Bookmark this page and use the calculator whenever you need a fast answer for school, work, shopping or business. It is free, works on mobile and desktop, and can be used as many times as you like.
