Percentage Calculator
Your entries are calculated in this browser and are not saved by this tool.
How the Percentage Calculator works
Calculate a percentage of a value, a ratio percentage or a percentage change. Enter the requested values in the tool above, select Calculate, and review both the main result and its breakdown.
Formula used
Percent of = X÷100×Y; ratio percent = X÷Y×100; change = (Y−X)÷|X|×100.
Worked example
20% of 150 is 30. A change from 100 to 120 is 20%.
Practical uses
- Calculate discounts
- Compare two values
- Measure growth or decline
Assumptions and limits
Results depend on the supplied values and displayed rounding. For reproducibility, record the inputs and assumptions used when sharing a result.
Frequently asked questions
Is this calculator free?
Yes. It can be used without creating an account.
Are the values I enter stored?
The calculation runs in your browser. The core tool does not submit your calculator entries to WordPress.
Can I rely on the result for a major decision?
Use it as an educational estimate, verify important inputs, and seek qualified advice when the decision carries financial, medical, tax or legal consequences.