Percentage Calculator
Find X% of Y, what percent X is of Y, percentage increase or decrease, difference between two values and reverse percentages — all in one tool.
Percentage Calculator
What is X% of Y?
X is what percent of Y?
Percentage increase between two values?
Percentage decrease between two values?
Percentage difference between two values?
X is Y% of what?
How It Works
Three steps to a percentage answer.
Choose a mode
Select X% of Y, what percent, increase, decrease, difference or reverse.
Enter the values
Type the two numbers required for that calculation.
Read the result
The result and a plain-English explanation appear instantly.
FAQ
Common questions about percentages.
Which percentage calculations are supported?
Percentage of a number, what percent one number is of another, increase, decrease, difference and reverse percentage.
How is percentage change computed?
Increase = (new-old)/old×100; decrease uses the same formula with the sign reversed.
What is percentage difference?
The absolute difference divided by the average of the two values, times 100.
What is a reverse percentage?
Finding the whole when you know a part and its percentage, e.g. 40 is 20% of 200.
Are results rounded?
Clean decimals are shown with trailing zeros removed for readable output.
Is anything uploaded?
No. All calculations happen locally in your browser.