Three modes: find percentage, reverse-calculate, and percentage change.
How to Calculate Percentage
Our percentage calculator covers the three most common percentage problems: finding X% of a number, finding what percentage one number is of another, and calculating the percentage change between two values.
Percentage Formulas Used
- X% of Y: Result = (X / 100) × Y
- X is what % of Y: Result = (X / Y) × 100
- Percentage Change: Result = ((New − Old) / Old) × 100
Common Use Cases
Students use percentage calculators for exam mark calculations. Shoppers use them to find discounts. Business professionals use them to track profit margins, sales growth, and budget allocation. Finance teams calculate interest rate changes. Teachers grade papers based on percentage scores.
Frequently Asked Questions
How do I calculate 20% of 500?
Use Mode 1. Enter 20 in the Percentage field and 500 in the Value field. The result is 100.
How do I find what percentage 45 is of 180?
Use Mode 2. Enter 45 as X and 180 as Y. The result is 25%.
How is percentage change calculated?
Percentage Change = ((New Value − Old Value) / Old Value) × 100. A positive result means an increase, negative means a decrease.
Can I calculate discount percentage?
Yes! Use Mode 3. Enter the original price as Old Value and the discounted price as New Value to find the discount percentage.
Is this percentage calculator free?
Yes, completely free. No sign-up, no limits, works offline once the page is loaded.