Percentage Calculator
Calculate percentages, percentage increase and decrease easily. Free, fast and private.
Your result will appear here.
Formula: X% of Y = (X / 100) × Y | X as % of Y = (X / Y) × 100 | % change = ((Y − X) / X) × 100
How to use Percentage Calculator
- Choose the calculation type — a percentage of a number, one number as a percentage of another, or a percentage increase/decrease.
- Enter both numbers in the two boxes.
- Click Calculate to see the result and the full working below it.
Note: this tool runs in your browser. Nothing is uploaded.
Frequently Asked Questions
How do I calculate 20% of 150?
20% of 150 is 30. Enter 20 as the first value and 150 as the second, choose 'What is X% of Y?' and click Calculate.
How do I find what percentage one number is of another?
Divide the first number by the second and multiply by 100. For example, 30 is 20% of 150 because (30 ÷ 150) × 100 = 20%.
How is percentage increase calculated?
Percentage change = ((new value − old value) ÷ old value) × 100. A positive answer is an increase; a negative answer is a decrease.
Is this percentage calculator free?
Yes, it is 100% free with no sign-up. Your data stays in your browser.