Percentage Calculator
Three quick percentage tools in one. Fill in any of the calculators below and the answer appears instantly.
What is X% of a number?
X is what percent of Y?
Percentage increase / decrease
About this percentage calculator
Percentages come up constantly — discounts, test scores, tips, statistics and more. This calculator bundles the three most common percentage questions into one page so you can get an answer in seconds, whichever type of calculation you need.
How to use it
- Pick the calculator that matches your question.
- Type your numbers into the boxes.
- The answer appears instantly as you type.
Frequently asked questions
How do I find a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 20% of 150 is 150 × 20 ÷ 100 = 30. The first calculator does this for you.
How do I calculate percentage increase?
Subtract the old value from the new value, divide by the old value, then multiply by 100. The third calculator handles increases and decreases automatically.
What is the difference between the three calculators?
The first finds a percentage of a number, the second finds what percent one number is of another, and the third finds the percentage change between two numbers.
Is it private?
Yes — all calculations happen in your browser.
Related tools
Try the Discount Calculator or Tip Calculator.