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➗ Percentage Calculator

Calculate percentages easily. Find X% of Y, percentage increase or decrease, and reverse percentage problems.

Percentage Calculator

Quickly calculate percentages with three useful tools: find X% of Y, determine what percentage X is of Y, and measure percentage change between two values.

X% of Y

Result

30.00

X is what % of Y

Result

7.50%

Percentage Change

From To

Result

25.00%

How to use this tool

Fill in the percentage and base value to calculate X% of Y.
Use the second card to reverse the math and find what percent one value is of another.
Compare before-and-after amounts in the change section to measure growth or decline.

Everyday uses

Budget forecasting: estimate tax, discounts, or markup instantly.
Analytics reviews: confirm percentage change in KPI dashboards.
Classroom help: demonstrate percentage math with clear inputs and outputs.

Accuracy tips

Leave blank fields at 0 to avoid unexpected NaN results.
Copy all results at once to share consistent calculations with teammates.
Download the summary when you need a quick audit trail for decisions.

FAQ

Why do I see a dash for percentage change?: If the starting value is 0, percentage change is undefined. Enter a non-zero baseline to see the result.
Can I use decimals?: Yes. The calculator accepts decimal inputs and rounds results to two decimal places.
How do I calculate increase vs. decrease?: Positive results indicate growth, negative values indicate decline. The colored badge highlights direction.

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