Percentage Calculator
Calculate percentages instantly with 5 types: basic percentage, reverse calculation, find total, percentage difference and change. Fast, accurate, and mobile-friendly.
What is X% of Y?
How to Use This Calculator
Our percentage calculator offers 5 different calculation modes to handle any percentage problem you encounter. Simply choose the appropriate tab, enter your values, and get instant results.
📝 Step-by-Step Instructions:
- 1. Select your calculation type from the tabs (Basic, Reverse, Total, Difference, or Change)
- 2. Enter your numbers in the input fields - the calculator accepts whole numbers, decimals, and negative values
- 3. View instant results - calculations happen automatically as you type, no need to click a button
- 4. Copy or clear - use "Copy Result" to copy the answer, or "Clear" to reset and start over
🌟 Real-World Use Cases:
Shopping Discounts
A store offers 25% off on a $80 jacket. How much will you save?
Use Basic tab: 25% of 80 = $20 savings
Tip Calculation
Your restaurant bill is $45 and you want to leave an 18% tip.
Use Basic tab: 18% of 45 = $8.10 tip
Test Scores
You scored 42 out of 50 points. What's your percentage?
Use Reverse tab: 42 is what % of 50? = 84%
Sales Growth
Sales increased from $10,000 to $12,500. What's the growth rate?
Use Change tab: From 10000 to 12500 = +25%
Budget Planning
You saved $450, which is 15% of your goal. What's your total goal?
Use Total tab: 450 is 15% of what? = $3,000
Price Comparison
Two products cost $120 vs $150. What's the percentage difference?
Use Difference tab: 120 vs 150 = 22.22% difference
💡 Pro Tips:
- Results update automatically as you type
- Works with positive, negative, and decimal numbers
- Click "Copy Result" to copy to clipboard
- Switch between tabs without losing your work
- No registration or download required
⚠️ Important Notes:
- Division by zero will show an error
- Results are rounded to 2 decimal places
- All calculations happen in your browser (private)
- Works offline after initial page load
- Compatible with all modern browsers
Frequently Asked Questions
What is a percentage?
A percentage is a way to express a number as a fraction of 100. It's denoted using the percent sign "%". For example, 25% means 25 out of 100, which equals 0.25 as a decimal.
How do I calculate a percentage?
The basic formula is: (Part / Total) × 100 = Percentage. For example, if you scored 18 out of 20 on a test, your percentage is (18/20) × 100 = 90%.
What is the difference between percentage difference and percentage change?
Percentage difference is direction-less and compares two values equally. Percentage change has direction and measures change from an initial to a final value.
Can I calculate percentages with negative numbers?
Yes! Negative numbers are valid in scenarios like temperature changes, negative growth rates, or financial losses. Our calculator handles negative numbers correctly.
What happens if I divide by zero?
Division by zero is mathematically undefined. Our calculator will show an error message if you try to divide by zero.