Percentage Calculator
Calculate percentages — of a number, increase, or decrease
Use negative for decrease
Result
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📌 What is a Percentage?
A percentage is a way of expressing a number as a fraction of 100. The symbol "%" means "per hundred." Percentages are used in everyday life for discounts, taxes, tips, exam scores, and much more.
Formula: Percentage = (Part ÷ Whole) × 100
🧮 How to Use This Calculator
- Choose the calculation type using the tabs above.
- Enter the required numbers in the fields.
- Click Calculate to get an instant result.
💡 Practical Examples
- Shopping discount: A $200 item at 15% off → save $30, pay $170
- Exam score: 45 correct out of 60 → 75%
- Sales tax: $100 + 15% VAT = $115
- Salary raise: $5,000 + 10% raise = $5,500
❓ FAQ
20% of 150 = 0.20 × 150 = 30.
Percentage increase = ((New − Old) / Old) × 100. For example, from 100 to 120 is a 20% increase.
Percentage = (Part / Whole) × 100. For example, 45 out of 60 = 75%.
If a final price after 20% discount is 80, the original is 80 / 0.80 = 100.