Percentage Calculator
Calculate percentages, percentage change, and what percentage one number is of another with instant results.
How to Use the Percentage Calculator
Enter the required values in the fields above and click Calculate. All calculations are executed directly inside your web browser using proven mathematical formulas, ensuring instantaneous results and 100% privacy without transmitting your numbers to remote servers.
Mathematical Formula
Worked Example
To find 15% of $80: (15 ÷ 100) × 80 = 0.15 × 80 = $12.00.
Important Notes & Limitations
When computing percentage change, the starting value cannot be zero because division by zero is mathematically undefined.
Frequently Asked Questions
Divide the percentage by 100 to convert it into a decimal, then multiply by the total number. For example, 25% of 200 is 0.25 × 200 = 50.
Percentage change measures the relative shift from an original starting value to a new value. Percentage difference compares two numbers relative to their average.