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Percentage Calculator
Six calculation modes with clear results
What is X% of Y?
X is what % of Y?
% Change
Increase / Decrease
X% of What Number?
% Difference
% of
Result
—
X% of Y equals the result shown above.
is what % of
Result
—
X represents this percentage of Y.
→
Result
—
The percentage change from the original value to the new value.
by
%
Result
Increase
—
Decrease
—
Increase and decrease formulas appear here.
% of what number is
Result
—
The reverse percentage formula appears here.
compared with
Percentage Difference
—
The percentage difference formula appears here.
About the Percentage Calculator
The Percentage Calculator covers six common percentage problems in one tool, including reverse percentage and percentage difference calculations.
How to Calculate a Percentage
- Choose the calculation mode you need from the tabs.
- Enter your values into the fields.
- See the result and explanation appear instantly.
Key Features
- Four calculation modes in one tool
- Clear, plain-language result explanations
- Instant, real-time results
- Handles both percentage increase and decrease
FAQ
Which percentage calculations can I do here?
You can find X% of Y, determine what percent X is of Y, calculate percentage change, and apply an increase or decrease.
What's the difference between % change and increase/decrease modes?
% Change tells you the percentage difference between two values, while Increase/Decrease applies a percentage to a starting value to get a new result.
Can I use negative numbers?
Yes, negative values are supported where they make sense, such as in percentage change.
Is my data stored anywhere?
No, all calculations happen entirely in your browser.