What is Percentage Calculator?
A percentage calculator solves the everyday percentage questions that come up in shopping, finance, study and work. This tool bundles three of the most common calculations into one place: finding a percentage of a number, working out what percentage one number is of another, and calculating the percentage increase or decrease between two values.
Each calculation updates live as you type, so you get an instant answer without remembering any formulas.
How to Use the Percentage Calculator
- Pick the calculation that matches your question.
- Enter the two numbers into the boxes.
- The answer appears instantly beneath each calculator.
- Use the increase/decrease box to compare an old and new value.
Features of Our Percentage Calculator
- Three calculators in one: of, is-what-percent, and change
- Live results as you type
- Handles increases and decreases automatically
- Guards against dividing by zero
- Clean, rounded, easy-to-read answers
- Instant and fully offline
Benefits & Use Cases
Shoppers work out discounts and tips, students solve maths problems, and professionals calculate growth, margins and changes in figures. Having the three core percentage operations side by side saves time and avoids errors.
All maths runs in your browser, so the calculator is fast and works even without an internet connection.
The Percentage Calculator is completely free, needs no sign-up or installation, and runs entirely in your browser — nothing you enter is uploaded to a server, so your data stays private. It works on desktop, tablet and mobile, in light or dark mode.
Tips & Best Practices
Pick the calculator that matches your question: "what is X% of Y" for discounts and tips, "X is what percent of Y" for scores and shares, and the change calculator for growth or drop between two figures. A positive change is an increase and a negative one a decrease, so you can compare an old and new value at a glance.
For shopping maths specifically, the Discount Calculator and GST / Tax Calculator apply these percentages to prices and tax for you.
FAQ about Percentage Calculator
How do I find a percentage of a number?
Use the first calculator: enter the percentage and the number, and it returns the result, for example 15% of 200 is 30.
How is percentage change calculated?
It is the difference between the new and old value divided by the old value, times 100. A positive result is an increase, a negative one a decrease.
Can it show a decrease?
Yes. If the second number is smaller than the first, the change calculator labels the result as a decrease automatically.
Are the results rounded?
Yes, to two decimal places for readability, which is accurate enough for everyday shopping, finance and study.