Work out percentages, what percent one number is of another, or the percentage increase or decrease between two values.
From calculating discounts and tips to figuring out grade percentages or year-over-year growth, percentage math comes up constantly in everyday life. This tool covers the three most common percentage calculations in one place, with instant, accurate results as you type.
Everything is calculated locally in your browser — no data is sent anywhere.
Use the "X is what % of Y" tab — enter the part as X and the total as Y, and the tool divides X by Y and multiplies by 100 automatically.
Percentage change is calculated as ((New Value - Old Value) / Old Value) × 100. A positive result means an increase, a negative result means a decrease.
No. All calculations happen instantly in your browser using JavaScript. Nothing is sent to a server or saved.
Yes, the "% Change" tab works well for calculating price increases or discounts between an old and new price.