Math
Percentage calculator
Calculate X percent of Y, X as a percentage of Y, and percentage change from X to Y.
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Using this tool
Calculate a percentage of a value, a ratio, or change from an initial to a final value.
Actions: X% of Y · X as % of Y · Change X → Y
Example
No text input: set X=200 and Y=150, then choose Change rather than X% of Y.
Example action and settings
Action: Change X → Y X (initial value for change): 200 Y (final value for change): 150
Input / action
Result / expected behavior
-25%
Available options: X (initial value for change) · Y (final value for change)
Scope and limitations
- Change uses (Y−X)/|X| and is undefined for X=0.
Common mistakes
- X as a percentage of Y differs from change from X to Y; ratio requires nonzero Y.
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Privacy and browser support
Input is processed in this browser. Do not use real keys or active sensitive credentials as demonstration data. Device features require browser support and your permission.