📊 Percentage Calculator
Calculate percentages instantly with 6 powerful calculator modes - Free & Secure
🔢 Basic Percentage Calculator
Calculate what percentage X is of Y
💡 Examples:
- 25 is what % of 200? → 12.5%
- 50 is what % of 200? → 25%
- 75 is what % of 300? → 25%
💯 What is X% of Y?
Calculate a percentage of a number
💡 Examples:
- What is 20% of 150? → 30
- What is 15% of 200? → 30
- What is 25% of 80? → 20
📈 Percentage Change
Calculate percentage increase or decrease between two values
💡 Examples:
- From 100 to 150 → +50% (increase)
- From 200 to 150 → -25% (decrease)
- From 50 to 75 → +50% (increase)
❓ X is Y% of What?
Find the whole when you know the part and percentage
💡 Examples:
- 50 is 25% of what? → 200
- 30 is 15% of what? → 200
- 75 is 50% of what? → 150
🏷️ Discount Calculator
Calculate the final price after a discount
💡 Examples:
- $100 with 20% off → $80.00 (save $20.00)
- $50 with 10% off → $45.00 (save $5.00)
- $200 with 30% off → $140.00 (save $60.00)
💵 Tip Calculator
Calculate tip amount and total bill
💡 Tip Guidelines:
- 10% - Average service
- 15% - Good service (standard)
- 18% - Very good service
- 20% - Excellent service
- 25%+ - Outstanding service
📋 Calculation History
No calculations saved yet. Use "Save to History" to store your results!
❓ Frequently Asked Questions
To calculate a percentage, use the formula: (Part ÷ Whole) × 100 = Percentage. For example, if you have 25 out of 200, the calculation is (25 ÷ 200) × 100 = 12.5%. Our Basic Percentage calculator does this automatically - just enter the part and whole values.
Use the formula: ((New Value - Old Value) ÷ Old Value) × 100. If the result is positive, it's an increase; if negative, it's a decrease. For example, going from 100 to 150: ((150 - 100) ÷ 100) × 100 = 50% increase. Use our Percentage Change calculator for instant results.
To calculate a discount: 1) Multiply the original price by the discount percentage (as a decimal), 2) Subtract that from the original price. For example, $100 with 20% off: $100 × 0.20 = $20 discount, so $100 - $20 = $80 final price. Our Discount calculator handles this automatically.
Standard tipping guidelines: 10% for average service, 15% for good service (most common), 18% for very good service, 20% for excellent service, and 25% or more for outstanding service. In some countries, tipping is not customary, so check local customs. Our Tip calculator makes it easy to compute the exact amount.
A percentage is a ratio expressed as a fraction of 100 (e.g., 75% means 75 out of 100). A percentile indicates the value below which a given percentage of observations fall. For example, if you're in the 90th percentile on a test, you scored better than 90% of test-takers. Our tool calculates percentages, not percentiles.
To convert a fraction to a percentage: 1) Divide the numerator by the denominator, 2) Multiply by 100. For example, 3/4 = 0.75 × 100 = 75%. Similarly, 1/2 = 0.5 × 100 = 50%. You can use our Basic Percentage calculator by entering the numerator as X and denominator as Y.
Absolutely! All calculations happen locally in your browser using JavaScript. Your numbers and calculation history are stored only on your device using localStorage. Nothing is ever sent to any server, ensuring complete privacy and security. We don't collect, store, or access your data in any way.
Yes! Our percentage calculator is perfect for business use: calculating profit margins, sales tax, discounts, markups, growth rates, commission percentages, and more. Many professionals use percentage calculations daily for pricing, financial analysis, and reporting. All calculations are accurate to many decimal places.
Yes! Our Percentage Calculator is 100% free with no hidden charges, no registration required, and no usage limits. You can perform unlimited calculations, save history, and use all features without any restrictions or premium upgrades.
Yes! Our calculator is fully responsive and works perfectly on smartphones, tablets, laptops, and desktop computers. It supports all modern browsers including Chrome, Firefox, Safari, and Edge. The interface adapts to your screen size for the best experience, making it easy to calculate on the go.
Our calculations are extremely accurate, using JavaScript's native floating-point arithmetic which provides precision up to 15-17 significant digits. Results are rounded to 2-4 decimal places for display, but the underlying calculations maintain full precision. This level of accuracy is sufficient for all everyday and business applications.
Yes! Use the "Save to History" button to store your calculations locally in your browser. Your history is saved automatically and will be available when you return. You can have up to 20 saved calculations. Use "Clear All" to reset the current calculator or clear your history anytime.