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Free Online Calculators & Conversion Tools
Percentage Calculator
Calculate percentages, percentage increase/decrease, and percentage of numbers
What is 20% of 100?
Increase 100 by 10%
Decrease 100 by 10%
20 is what percent of 100?
Visual Representation
Calculation Result
Result
20
Final Value
Calculation Type
Basic Percentage
Selected Calculation
Percentage
20%
Applied Percentage
Calculation Steps
Step 1: Original Values
Percentage = 20%, Number = 100
Step 2: Convert Percentage to Decimal
20% = 20 ÷ 100 = 0.2
Step 3: Multiply
0.2 × 100 = 20
Step 4: Final Result
20% of 100 is 20
Percentage Calculator Features
Main Features
- Basic Percentage Calculation – Calculate X% of Y
- Percentage Increase – Increase X by Y%
- Percentage Decrease – Decrease X by Y%
- Percentage Difference – Calculate what percentage X is of Y
- Visual Representation – Graphical display of results
- Step-by-Step Solutions – Detailed calculation steps
- Real-time Updates – Instant results as you type
- Error Handling – Validation and error messages
- Responsive Design – Works on all devices
- Clean Interface – User-friendly and intuitive design
Calculation Types
1. Basic Percentage
- Function: What is X% of Y?
- Example: What is 20% of 100? → Result: 20
2. Percentage Increase
- Function: Increase X by Y%
- Example: Increase 100 by 10% → Result: 110
3. Percentage Decrease
- Function: Decrease X by Y%
- Example: Decrease 100 by 10% → Result: 90
4. Percentage Difference
- Function: X is what % of Y?
- Example: 20 is what % of 100? → Result: 20%
Additional Features:
- Visual Charts: Bar graphs showing original vs result values
- Calculation History: Step-by-step breakdown of calculations
- Color-coded Results: Different colors for increase (green) and decrease (red)
- Mobile Optimization: Perfect display on smartphones and tablets
- Fast Performance: Instant calculations without page reload
- Professional Design: Modern UI with gradient headers and card layouts
User Experience
- Intuitive Navigation: Easy switching between calculation types
- Clear Labels: Well-organized input fields
- Instant Feedback: Real-time results and error messages
- Visual Feedback: Interactive buttons and hover effects
- Accessible Design: Proper contrast and readable fonts
Technical Features
- Pure JavaScript: No external dependencies
- Cross-browser Compatible: Works on all modern browsers
- SEO Optimized: Proper meta tags and semantic HTML
- Fast Loading: Optimized code for quick performance
- No Backend Required: All calculations done client-side
