Percentage Calculator
Calculate percentages, discounts, and more
🔒 100% Private
⚡ Instant Results
💰 Free Forever
📱 Works on Mobile
Quick Examples
Percentage Calculator by Type
Discount Calculator by Percentage
Tip Calculator by Percentage
GST Calculator by Percentage
How Percentage Calculator Works
- Select Calculation Type: Choose from Basic %, Discount, % Change, or Tip
- Enter Values: Input the numbers you want to calculate
- Get Instant Results: See the calculation and breakdown instantly
- Use Examples: Click example buttons to try common scenarios
Percentage Formulas
What is X% of Y?
Result = (X ÷ 100) × Y
Example: 20% of 5,000 = (20 ÷ 100) × 5,000 = 1,000
X is what percent of Y?
Percentage = (X ÷ Y) × 100%
Example: 1,000 ÷ 5,000 × 100 = 20%
Percentage Change
% Change = ((Final - Initial) ÷ |Initial|) × 100%
Example: (6,000 - 5,000) ÷ 5,000 × 100 = 20% increase
Discount Calculation
Sale Price = Original Price × (1 - Discount% ÷ 100)
Example: 5,000 × (1 - 0.20) = 4,000
Benefits of Using Our Percentage Calculator
- ✓ 4 Calculators in 1: Basic %, Discount, % Change, and Tip
- ✓ Real-time Results: Instant calculations as you type
- ✓ Preset Buttons: Quick common percentage selections
- ✓ Split Bills: Tip calculator with per-person amounts
- ✓ Free & Unlimited: No sign-up or limits
- ✓ Mobile Friendly: Works perfectly on all devices
Frequently Asked Questions
How do I calculate 20% of a number?
Multiply the number by 0.20 or divide by 5. Example: 20% of 500 = 500 × 0.20 = 100. Use our calculator's "What is X% of Y?" mode for instant results.
How to calculate percentage increase between two numbers?
Use the formula: ((New Value - Original Value) ÷ Original Value) × 100. Example: From 50 to 75 = ((75-50)÷50)×100 = 50% increase. Try our % Change tab!
How to calculate discount percentage from original price?
Use the formula: ((Original Price - Sale Price) ÷ Original Price) × 100. Example: ₹1,000 original, ₹800 sale = ((1000-800)÷1000)×100 = 20% discount.
How much tip should I leave at a restaurant?
Standard tipping in India: 5-10% for good service, 10-15% for excellent service. Use our tip calculator to split bills among groups.
How to calculate GST percentage?
GST Amount = (Original Price × GST Rate) ÷ 100. For 18% GST on ₹10,000 = ₹1,800 GST. Total price = ₹11,800.
Is this percentage calculator free?
Yes, completely free! No sign-up, no credit card, no hidden fees. Your data stays in your browser - we don't store any information.
🔒 Privacy Guarantee: Your data never leaves your browser. We don't store, log, or share any information you enter. 100% private and secure.
Common Percentage Calculations
🏷️ Shopping Discounts
10% off = Pay 90%
20% off = Pay 80%
30% off = Pay 70%
50% off = Pay 50%
💰 Business & Finance
10% Profit Margin
20% ROI Target
30% Markup
50% Break-even
📊 GST Rates
5% GST - Essential goods
12% GST - Processed food
18% GST - Standard rate
28% GST - Luxury goods
🎯 Exam Scores
60% - Passing
75% - First Class
85% - Distinction
90%+ - Outstanding
Quick Percentage Increase/Decrease Reference
| Original → New | % Change | Multiplier |
|---|---|---|
| 100 → 110 | +10% | × 1.10 |
| 100 → 120 | +20% | × 1.20 |
| 100 → 150 | +50% | × 1.50 |
| 100 → 200 | +100% | × 2.00 |
| 100 → 90 | -10% | × 0.90 |
| 100 → 80 | -20% | × 0.80 |
| 100 → 50 | -50% | × 0.50 |
Master Your Percentage Calculations
Free percentage calculator for shopping discounts, business margins, exam scores, and more.