Percentage Calculator: Calculate Percentages, Increases, and Decreases Instantly
Calculate any percentage: what is X% of Y, percentage change between two numbers, percentage increase or decrease, and reverse percentage calculations. Multiple modes in one tool.
Percentage Formulas
Four core percentage calculation types, each with its own formula.
Percentage change is positive for increases and negative for decreases. 'Percent' comes from Latin 'per centum' meaning 'by the hundred.'
How to Use the Percentage Calculator
Select the calculation type
Choose from: X% of Y, X is what % of Y, percentage change, or percentage increase/decrease.
Enter your numbers
Fill in the values for your chosen calculation type.
Click Calculate
See the result with a full explanation of the calculation.
Real-World Scenario Example
"What is 15% of $85? → (15 ÷ 100) × 85 = $12.75. A $85 restaurant bill with 15% tip = $12.75 tip = $97.75 total."
Inputs
Result
$12.75
Important Disclaimer
All calculations use standard mathematical formulas. Results are accurate to floating-point precision. For financial calculations involving percentages, always verify results with your financial institution or advisor.
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