Four percentage calculators in one tool. Find what X% of Y is, determine percentages, calculate percentage change, and increase or decrease values by percent. Real-time results with zero clicks.
Percentages come up constantly — discounts, tax rates, grade calculations, year-over-year growth. But the mental math gets tricky fast. "What's 17.5% of 2,340?" or "$45 is what percent of $312?" This calculator handles four different percentage scenarios and gives you the answer as you type. No formulas to remember, no spreadsheet to open.
What Can You Calculate?
4 Calculation Modes
Find X% of Y, what percentage X is of Y, percentage change, and increase/decrease by percentage.
Real-Time Results
See answers update instantly as you type. No button clicks needed.
Percentage Change
Calculate percentage increase or decrease between two values — essential for business and finance.
Visual Feedback
Color-coded results make it easy to distinguish increases (green) from decreases (red).
Common Percentage Formulas
| Calculation | Formula | Example |
|---|---|---|
| X% of Y | (X / 100) × Y | 20% of 150 = 30 |
| X is ?% of Y | (X / Y) × 100 | 30 is 20% of 150 |
| % Change | (New − Old) / Old × 100 | 80 → 100 = +25% |
| Increase by % | X × (1 + P/100) | 100 + 15% = 115 |
Who Uses This Tool?
Students
Solve math homework and exam problems involving percentages
Business Analysts
Calculate growth rates, margins, and performance changes
Shoppers
Figure out sale prices and discount savings quickly
Everyone
Tips, taxes, and everyday percentage calculations