Calculate percentages instantly — find X% of Y, percentage change, increase/decrease by %, and what percent X is of Y.
What is Percentage Calculator?
Five powerful modes in one tool: find X% of any number, calculate percentage change between values, determine what percent one number is of another, and increase or decrease a number by a percentage. Features visual percentage bars, step-by-step formula breakdowns, real-world context examples (tips, discounts, tax), quick-select presets, a donut chart for proportions, reverse calculations, and a saved history. Results update in real-time as you type — perfect for students, shoppers, finance, and business.
How to Use
Choose a calculation mode — X% of Y, % Change, X is what % of Y, Increase by %, or Decrease by %
Use quick-select buttons or type your own numbers
See results instantly with a visual percentage bar and donut chart
Click "Show Step-by-Step Solution" to see the formula breakdown
Save calculations to history for quick reference
Frequently Asked Questions
What calculation modes are available?
Five modes: What is X% of Y (e.g. 25% of 200), Percentage Change between two values, X is what % of Y, Increase a number by %, and Decrease a number by %.
How do I calculate a tip?
Use "X% of Y" mode. Enter the tip percentage (e.g. 15, 18, or 20) and your bill amount. The result is your tip amount. The real-world context section shows the breakdown automatically.
How do I calculate a discount?
Use "Decrease by %" mode. Enter the discount percentage and the original price. You'll see the final price, plus how much you save.
Can I see the formula?
Yes! Click "Show Step-by-Step Solution" below the result to see the complete formula and each calculation step.
Does this tool save my calculations?
Yes, click the "Save" button next to any result to add it to your session history. Click any saved calculation to restore it.
How is percentage change calculated?
Percentage change = ((New Value − Old Value) ÷ Old Value) × 100. A positive result means an increase; negative means a decrease.
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