Percentage Calculator
Calculate percentages, percentage change, and reverse percentages with clear formulas.
About the tool
What it does and what to expect
About the tool
What it does and what to expect
Everyday percentage calculations
Shoppers, students, analysts, and business owners use percentages to compare values, calculate proportions, and measure change. The three modes cover “percent of,” percentage change, and reverse percentage questions.
A worked example
What is 15% of 200? Choose “What is X% of Y?”, enter 15 and 200, and the result is 30 instantly. To measure growth from 200 to 230, choose percentage change to get 15%.
How it works
A simple, local workflow
How it works
A simple, local workflow
- 1Choose a calculation mode, then enter the percentage and value—or the starting and ending values for percentage change.
- 2The calculator applies the matching percentage formula and updates the answer instantly.
- 3Use the formula shown with the result to understand or verify the calculation.
FAQs
Common questions
FAQs
Common questions
How do I calculate a percentage of a number?
Divide the percentage by 100 and multiply it by the number. For example, 15 ÷ 100 × 200 = 30.
How is percentage increase calculated?
Subtract the old value from the new value, divide by the absolute old value, then multiply by 100.
How do I find what percent one number is of another?
Divide the first number by the second and multiply by 100. For example, 30 is 15% of 200.
Text & Everyday Utility
Related tools
Word & Character Counter
Count words, characters, sentences, paragraphs, reading time, and keyword density as you type.
Age Calculator
Calculate an exact age in years, months, and days, plus the next birthday countdown.
Random Password Generator
Generate strong cryptographic passwords with precise character and readability controls.
Comments & feedback
Help make this tool better
Found an edge case or have a useful idea? Send a private note to the team. Your email app opens only after you choose to send.