Percentage Calculator
A fast two-way percentage calculator — find a percentage of a value, or compute the percentage between two numbers.
What is X% of Y?
X is what % of Y?
About the Percentage Calculator
The Percentage Calculator handles the three most common percentage questions in one place: 'what is X% of Y?', 'X is what percent of Y?' and '% change from A to B'. No formulas to remember.
How to use the Percentage Calculator
- 1Pick the calculation mode you need.
- 2Enter the two known numbers.
- 3Read the answer instantly — no submit button required.
Why people use it
- Calculate discounts, tips, and sales tax on the fly.
- Work out grade percentages and score conversions.
- Track percentage changes in prices, weights or metrics.
- Double-check spreadsheet formulas.
Frequently asked questions
How is percentage change calculated?
((new − old) / old) × 100. A negative result means a decrease; positive means an increase.
Is there a limit on the numbers I can enter?
Only your browser's numeric precision. For very large numbers, expect the same rounding you'd see in a spreadsheet.
Related tools you might like
Percentage Change Calculator
% increase or decrease between two values.
BMI Calculator
Body Mass Index calculator with metric & imperial units.
Age Calculator
Calculate exact age in years, months and days.
Loan / EMI Calculator
Monthly EMI, total interest and total payable for any loan.
Tip Calculator
Split a bill with tip across any number of people.
Discount Calculator
Final price after % discount and total savings.