Percentage Calculator
Calculate percentages: find a percentage of a number, what percent one number is of another, or the percentage change between two values.
The Percentage Calculator handles the three most common percentage questions in one tool. Select the mode you need and enter two values to get an instant answer.
In "What is X% of Y?" mode, the tool multiplies the percentage by the number. This answers questions like "What is 15% of 200?" and is commonly used for calculating tips, discounts, tax amounts, and commissions.
In "X is what % of Y?" mode, the tool divides the first number by the second and multiplies by 100. This answers questions like "45 is what percent of 200?" and is useful for grading, performance metrics, and statistical analysis.
In "% change from X to Y" mode, the tool computes the relative difference between the original and new value. This answers questions like "What is the percentage change from 80 to 100?" and is commonly used in finance, sales reports, and year-over-year comparisons.
All calculations are performed entirely in your browser. No data leaves your device, and no account is required.
In "What is X% of Y?" mode, the tool multiplies the percentage by the number. This answers questions like "What is 15% of 200?" and is commonly used for calculating tips, discounts, tax amounts, and commissions.
In "X is what % of Y?" mode, the tool divides the first number by the second and multiplies by 100. This answers questions like "45 is what percent of 200?" and is useful for grading, performance metrics, and statistical analysis.
In "% change from X to Y" mode, the tool computes the relative difference between the original and new value. This answers questions like "What is the percentage change from 80 to 100?" and is commonly used in finance, sales reports, and year-over-year comparisons.
All calculations are performed entirely in your browser. No data leaves your device, and no account is required.
Calculator
Results
—
How to Use
- Select the calculation mode from the dropdown.
- Enter the two values in the input fields.
- View the percentage result instantly.
FAQ
What does each mode do?
Percentage Of computes X% of Y. What Percent computes what percentage X is of Y. Percent Change computes the percentage increase or decrease from X to Y.
Can the result be negative?
Yes. In Percent Change mode, a negative result indicates a decrease from the first value to the second.
How many decimal places are shown?
Results are shown with up to six decimal places, with trailing zeros removed for clean display.
Is my data safe in the browser?
Yes. All calculations run locally in your browser using JavaScript. No data is sent to any server.
Part of These Collections
Curated tool sets for specific workflows
Thank you! Your report has been submitted.