Percentage Calculator
Calculate percentages quickly and easily online. Free, instant.
Free · No sign-upHow to use Percentage Calculator
- 1. Find the calculator row that matches your question: “What is X% of Y,” “X is what % of Y,” percent change, increase or decrease.
- 2. Type your numbers into the two boxes on that row; decimals and negative numbers are accepted.
- 3. The answer appears instantly after the equals sign. Percent change also says whether it’s an increase or a decrease.
- 4. Change any value to recalculate right away, and use the other rows to check related figures such as the final price after a discount.
Frequently asked questions
Is the percentage calculator free to use?
Yes. It’s free, needs no sign-up and has no limits. All five calculators work together on one page, so you can check several percentage questions at once without switching tools.
Does the percentage calculator send my numbers anywhere?
No. Every calculation runs in your browser as you type. The numbers you enter aren’t sent to a server or saved, so you can use it for salaries, grades or business figures privately.
How do I calculate a percentage of a number?
Use the first row, “What is X % of Y.” Enter the percentage and the number, for example 20 and 150, and the result, 30, appears right away. The formula is the number times the percentage divided by 100.
How do I calculate percentage change between two numbers?
Use the “% change from” row. Enter the old value first and the new value second. The tool subtracts the old from the new, divides by the old value and multiplies by 100, then labels the result as an increase or decrease, for example 80 to 100 is +25%.
How do I work out a price after a percentage discount?
Use the “decreased by” row. Enter the original price and the discount percentage, for example 50 and 15, and it shows 42.5. For a markup or price increase, use the “increased by” row the same way.
How precise are the percentage results?
Results are rounded to up to four decimal places and shown with US-style comma separators for large numbers. Percent change and “what percent” show a dash when the math is undefined, such as dividing by zero.