Percentage Calculator
Calculate percentages, increases, decreases, and reverse percentages.
About this tool
Percentages show up in discounts, exam scores, tips, and growth rates—and mental math gets messy with decimals. This free percentage calculator solves common percent problems: what is X% of Y, what percent is A of B, and percent increase or decrease between two values. Results appear instantly so you can check homework, sale prices, or KPI changes without a spreadsheet. Clear modes keep each question type obvious.
How to use
- Pick the percentage problem type (percent of, reverse percent, or change).
- Enter the numbers involved in the labeled fields.
- Calculate to see the result and any related breakdown.
- Copy the answer into your homework, sheet, or price tag.
- Switch modes to solve a different percentage question with new inputs.
Features
- Percent of a number
- Reverse percentage (part of whole)
- Percent increase and decrease
- Free calculator
Notes
- Not a full spreadsheet with named scenarios
- Compounding over many periods needs a finance tool
- Currency rounding rules are not jurisdiction-specific
Frequently asked questions
Yes. Enter the original and new values (or original plus percent change) depending on the mode to see how much something grew or shrank in percent terms.